What is NAS?
*Network attached storage, or NAS, has advantages and challenges over SANs. Here you'll find info on network attached storage clusters, hardware or appliances, NAS management.
What is SAN?
*Storage area network (SAN) is an architecture to attach remote computer storage devices such as disk array controllers, tape libraries and CD arrays to servers in such a way that to the operating system the devices appear as locally attached devices. Although cost and complexity is dropping, as of 2007, SANs are still uncommon outside larger enterprises.
Tuesday, May 15, 2007
What is NAS?
What is NAS?
*Network attached storage, or NAS, has advantages and challenges over SANs. Here you'll find info on network attached storage clusters, hardware or appliances, NAS management.
What is SAN?
*Storage area network (SAN) is an architecture to attach remote computer storage devices such as disk array controllers, tape libraries and CD arrays to servers in such a way that to the operating system the devices appear as locally attached devices. Although cost and complexity is dropping, as of 2007, SANs are still uncommon outside larger enterprises.
*Network attached storage, or NAS, has advantages and challenges over SANs. Here you'll find info on network attached storage clusters, hardware or appliances, NAS management.
What is SAN?
*Storage area network (SAN) is an architecture to attach remote computer storage devices such as disk array controllers, tape libraries and CD arrays to servers in such a way that to the operating system the devices appear as locally attached devices. Although cost and complexity is dropping, as of 2007, SANs are still uncommon outside larger enterprises.
Monday, May 14, 2007
What is blue tooth?
What is IPV6?
*Internet Protocol version 6 (IPv6) is a network layer standard used by electronic devices to exchange data across a packet-switched internetwork. It follows IPv4 as the second version of the Internet Protocol to be formally adopted for general use.
What is Blue tooth?
*Bluetooth is an industrial specification for wireless personal area networks (PANs). Bluetooth provides a way to connect and exchange information between devices like personal digital assistants (PDAs), mobile phones, laptops, PCs, printers and digital cameras via a secure
*Internet Protocol version 6 (IPv6) is a network layer standard used by electronic devices to exchange data across a packet-switched internetwork. It follows IPv4 as the second version of the Internet Protocol to be formally adopted for general use.
What is Blue tooth?
*Bluetooth is an industrial specification for wireless personal area networks (PANs). Bluetooth provides a way to connect and exchange information between devices like personal digital assistants (PDAs), mobile phones, laptops, PCs, printers and digital cameras via a secure
What is blue tooth?
What is IPV6?
*Internet Protocol version 6 (IPv6) is a network layer standard used by electronic devices to exchange data across a packet-switched internetwork. It follows IPv4 as the second version of the Internet Protocol to be formally adopted for general use.
What is Blue tooth?
*Bluetooth is an industrial specification for wireless personal area networks (PANs). Bluetooth provides a way to connect and exchange information between devices like personal digital assistants (PDAs), mobile phones, laptops, PCs, printers and digital cameras via a secure
*Internet Protocol version 6 (IPv6) is a network layer standard used by electronic devices to exchange data across a packet-switched internetwork. It follows IPv4 as the second version of the Internet Protocol to be formally adopted for general use.
What is Blue tooth?
*Bluetooth is an industrial specification for wireless personal area networks (PANs). Bluetooth provides a way to connect and exchange information between devices like personal digital assistants (PDAs), mobile phones, laptops, PCs, printers and digital cameras via a secure
Wednesday, May 9, 2007
What is 802 11?
What is 802 11?
*802.11, the Wi-Fi standard, denotes a set of Wireless LAN/WLAN standards developed by working group 11 of the IEEE LAN/MAN Standards Committee (IEEE 802).
What is PCS?
*Personal Communications Service or PCS is the name for the 1900-MHz radio band used for digital mobile phone services in Canada and the United States.
What is GSM?
*GSM is a cellular network, which means that mobile phones connect to it by searching for cells in the immediate vicinity.
*802.11, the Wi-Fi standard, denotes a set of Wireless LAN/WLAN standards developed by working group 11 of the IEEE LAN/MAN Standards Committee (IEEE 802).
What is PCS?
*Personal Communications Service or PCS is the name for the 1900-MHz radio band used for digital mobile phone services in Canada and the United States.
What is GSM?
*GSM is a cellular network, which means that mobile phones connect to it by searching for cells in the immediate vicinity.
Tuesday, May 8, 2007
Whats is encrypton?
What is encrypton?
*Encryption is the process of scrambling data so that it becomes unreadable by unauthorized users. Read our email section for more information on encrypting email messages and the best encryption packages available on the Internet.
What is public key?
*Public key cryptography is a form of cryptography which generally allows users to communicate securely without having prior access to a shared secret key.
What is Private key?
*
Public key cryptography is a form of cryptography which generally allows users to communicate securely without having prior access to a shared secret key.
*Encryption is the process of scrambling data so that it becomes unreadable by unauthorized users. Read our email section for more information on encrypting email messages and the best encryption packages available on the Internet.
What is public key?
*Public key cryptography is a form of cryptography which generally allows users to communicate securely without having prior access to a shared secret key.
What is Private key?
*
Public key cryptography is a form of cryptography which generally allows users to communicate securely without having prior access to a shared secret key.
Monday, May 7, 2007
What is Frame relay?
What is frame relay?
* Frame relay is defined as a communications protocol as well as a packet data service. This paper will describe frame relay as a packet data service because of its ability to create a Wide Area Network (WAN) that can integrate an enterprise infrastructure.
What is VPN?
* VPN stands for Virtual Private Network, and relates to a set of software and hardware that enable your computer to transparently connect to a remote network as if you were physically attached to that network.
What is VLAN?
*VLAN is a method of creating independent logical networks within a physical network. Several VLANs can co-exist within such a network. This helps in reducing the broadcast domain and aids in network administration by separating logical segments of a LAN (like company departments) that should not exchange data using a LAN (they still can exchange data by routing
* Frame relay is defined as a communications protocol as well as a packet data service. This paper will describe frame relay as a packet data service because of its ability to create a Wide Area Network (WAN) that can integrate an enterprise infrastructure.
What is VPN?
* VPN stands for Virtual Private Network, and relates to a set of software and hardware that enable your computer to transparently connect to a remote network as if you were physically attached to that network.
What is VLAN?
*VLAN is a method of creating independent logical networks within a physical network. Several VLANs can co-exist within such a network. This helps in reducing the broadcast domain and aids in network administration by separating logical segments of a LAN (like company departments) that should not exchange data using a LAN (they still can exchange data by routing
Thursday, May 3, 2007
What is T1?
What is T1?
*T1 •Digital Signal 1, originally over a "T1" interoffice "trunk" or "Transmission Level 1" telecommunications line in North America and Japan •T1 General tax form used in Canada for personal tax returns
What is T3?
*T-3 is used for various purposes as a designation, abbreviation or identifier: •T3 is a type of telecommunications service, see T-carrier •T3 is the IATA airline designator for a UK domestic airline Eastern Airways
*T1 •Digital Signal 1, originally over a "T1" interoffice "trunk" or "Transmission Level 1" telecommunications line in North America and Japan •T1 General tax form used in Canada for personal tax returns
What is T3?
*T-3 is used for various purposes as a designation, abbreviation or identifier: •T3 is a type of telecommunications service, see T-carrier •T3 is the IATA airline designator for a UK domestic airline Eastern Airways
Wednesday, May 2, 2007
what is modern?
What is Modern?
*The Moderns Fan Co. products do not use conventional pull chains (with the exception of the Industry Fan) to change the fan speed or turn on the lights.
What is the speed of modern?
*120 volt/60Hz., 1.25 amp capacity
What is the most recent standard of traditional modern?
*
What is ADSL?
*Standard for transmitting data through existing copper telephone wires. ADSL was developed by US telephone companies as a way of competing with cable television companies in delivering both TV and telephone services.
*The Moderns Fan Co. products do not use conventional pull chains (with the exception of the Industry Fan) to change the fan speed or turn on the lights.
What is the speed of modern?
*120 volt/60Hz., 1.25 amp capacity
What is the most recent standard of traditional modern?
*
What is ADSL?
*Standard for transmitting data through existing copper telephone wires. ADSL was developed by US telephone companies as a way of competing with cable television companies in delivering both TV and telephone services.
Tuesday, May 1, 2007
Dial up service provider
Find a dial up service provider who offers some free connection. Give a short description of how it works and how much free time you can have.
Receive 3 months MSN Dial-up free trial. A separate download may be required. Secure or encrypted Web pages are not accelerated. Transmission of some files—including streaming media, MP3 or other music files, digital photos, and executable files—is not faster using MSN Dial-up Accelerator than standard dial-up.Stay online as long as you like for one monthly fee.Included in your membership are anti-phishing, MSN® Virus Guard, MSN Firewall both powered by McAfee Security, Webroot® Spy Sweeper™ for MSN, Pop-up Guard and Junk E-mail Guard, to help protect your PC and personal data. Parental controls help keep the kids safer online.Surf faster by speeding up the downloading of select Web pages and files.*
Receive 3 months MSN Dial-up free trial. A separate download may be required. Secure or encrypted Web pages are not accelerated. Transmission of some files—including streaming media, MP3 or other music files, digital photos, and executable files—is not faster using MSN Dial-up Accelerator than standard dial-up.Stay online as long as you like for one monthly fee.Included in your membership are anti-phishing, MSN® Virus Guard, MSN Firewall both powered by McAfee Security, Webroot® Spy Sweeper™ for MSN, Pop-up Guard and Junk E-mail Guard, to help protect your PC and personal data. Parental controls help keep the kids safer online.Surf faster by speeding up the downloading of select Web pages and files.*
Monday, April 30, 2007
What is ISDN?
What is ISDN?
*Integrated Services Digital Network (ISDN) is a type of circuit switched telephone network system, designed to allow digital transmission of voice and data over ordinary telephone copper wires, resulting in better quality and higher speeds than available with analog systems.
What is PSTN?
*public switched telephone network (PSTN) is the concentration of the world's public circuit-switched telephone networks, in much the same way that the Internet is the concentration of the world's public IP-based packet-switched networks.
What is POTS?
*public switched telephone network (PSTN) is the concentration of the world's public circuit-switched telephone networks, in much the same way that the Internet is the concentration of the world's public IP-based packet-switched networks.
*Integrated Services Digital Network (ISDN) is a type of circuit switched telephone network system, designed to allow digital transmission of voice and data over ordinary telephone copper wires, resulting in better quality and higher speeds than available with analog systems.
What is PSTN?
*public switched telephone network (PSTN) is the concentration of the world's public circuit-switched telephone networks, in much the same way that the Internet is the concentration of the world's public IP-based packet-switched networks.
What is POTS?
*public switched telephone network (PSTN) is the concentration of the world's public circuit-switched telephone networks, in much the same way that the Internet is the concentration of the world's public IP-based packet-switched networks.
Thursday, April 26, 2007
What is DNS?
What is DNS?
*Domain Name System (DNS) stores and associates many types of information with domain names; most importantly, it translates domain names (computer hostnames) to IP addresses.
What is WINS?
*WINS- is a proprietary Microsoft name resolution service that provides dynamic NetBIOS
What is DHCP?
*DHCP is a set of rules used by communications devices such as a computer, router or network adapter to allow the device to request and obtain an IP address from a server which has a list of addresses available for assignment
*Domain Name System (DNS) stores and associates many types of information with domain names; most importantly, it translates domain names (computer hostnames) to IP addresses.
What is WINS?
*WINS- is a proprietary Microsoft name resolution service that provides dynamic NetBIOS
What is DHCP?
*DHCP is a set of rules used by communications devices such as a computer, router or network adapter to allow the device to request and obtain an IP address from a server which has a list of addresses available for assignment
Terminal Emulator
What is it?
*A terminal emulator- terminal application, term, or tty for short, is a program that emulates a "dumb" video terminal within some other display architecture.
How does it work?
*Terminals usually support a set of escape sequences for controlling color, cursor position, etc.
*A terminal emulator- terminal application, term, or tty for short, is a program that emulates a "dumb" video terminal within some other display architecture.
How does it work?
*Terminals usually support a set of escape sequences for controlling color, cursor position, etc.
Monday, April 16, 2007
What is protocol?
What is protocol?
*Protocol- is nothing more than a way of behaving; a set of rules of deportment.
What is TCP/IP?
*Internet protocol- suite is the set of communications protocols that implements the protocol stack on which the Internet and many commercial networks run. It is part of the TCP/IP protocol suite, which is named after two of the most important protocols in it: the Transmission Control Protocol (TCP).
*Internet Protocol- (IP), which were also the first two networking protocols defined.
*Protocol- is nothing more than a way of behaving; a set of rules of deportment.
What is TCP/IP?
*Internet protocol- suite is the set of communications protocols that implements the protocol stack on which the Internet and many commercial networks run. It is part of the TCP/IP protocol suite, which is named after two of the most important protocols in it: the Transmission Control Protocol (TCP).
*Internet Protocol- (IP), which were also the first two networking protocols defined.
What is the difference between intranet & extranet?
What is the difference between intranet & extranet?
*An Intranet- is a computer network that uses the same technology and protocols as the Internet but is restricted to certain users. For example a big UK company like Boots, may have an Intranet in their main offices that is only available to employees of Boots.
*An extranet- is a private network that uses the Internet protocol and the public telecommunication system to securely share part of a business's information or operations with suppliers, vendors, partners, customers, or other businesses.
What is Proxy?
*
*An Intranet- is a computer network that uses the same technology and protocols as the Internet but is restricted to certain users. For example a big UK company like Boots, may have an Intranet in their main offices that is only available to employees of Boots.
*An extranet- is a private network that uses the Internet protocol and the public telecommunication system to securely share part of a business's information or operations with suppliers, vendors, partners, customers, or other businesses.
What is Proxy?
*
Friday, April 13, 2007
What is Recovey CD
What is Recovery CD?
*Reinstall, bootable disk, and everything can get eaten up.
What is Ghost imaging?
*Method of converting the contents of a hard into an image and then storing the image on a server or burning a CD.
Give an example of a ghost software.........-What is the name of the software? Norton Ghost-Which company product it? Symantec-What can it do?
*Effective disk cl0ning software
*Reinstall, bootable disk, and everything can get eaten up.
What is Ghost imaging?
*Method of converting the contents of a hard into an image and then storing the image on a server or burning a CD.
Give an example of a ghost software.........-What is the name of the software? Norton Ghost-Which company product it? Symantec-What can it do?
*Effective disk cl0ning software
What is Norton Antivirus
What is Norton Antivirus?
*Norton AntiVirus (NAV) -is a product of Symantec Corporation and is one of the most widely used antivirus programs. Norton AntiVirus is sold as a standalone product and is also included as part of Norton SystemWorks. In addition, there is also a standalone corporate edition version, which is aimed at a centrally managed corporate environment. It is called Symantec AntiVirus Corporate Edition and has different features not present in the traditional retail version of the software.
What functions does it have?
*This software is typically regarded as making considerable demands on resources. In common with other Norton products, Norton AntiVirus relies on Internet Explorer's web interface, instead of using the standard GUI libraries. Besides using more resources, any problems or changes to Internet Explorer will be reflected in Norton products, commonly resulting in "Script Error" messages when the user opens or uses a Norton program.
What is Spybot?
*Spybot - Search & Destroy (often Spybot-S&D) is a popular malware, spyware and adware removal program which works on Microsoft Windows 95 and later. Like most malware scanners, Spybot-S&D scans the computer hard disk and/or RAM for malicious software.
What is Ad-ware?
* Adware- is considered to go beyond the reasonable advertising that one might expect from freeware or shareware. Typically a separate program that is installed at the same time as a shareware or similar program, adware will usually continue to generate advertising even when the user is not running the origianlly desired program.
What is google toolbar?
*Google tool bar- feature introduced this week is rekindling a debate over who should control what appears on a Web page—the site's creator or the software used to view it.
*Norton AntiVirus (NAV) -is a product of Symantec Corporation and is one of the most widely used antivirus programs. Norton AntiVirus is sold as a standalone product and is also included as part of Norton SystemWorks. In addition, there is also a standalone corporate edition version, which is aimed at a centrally managed corporate environment. It is called Symantec AntiVirus Corporate Edition and has different features not present in the traditional retail version of the software.
What functions does it have?
*This software is typically regarded as making considerable demands on resources. In common with other Norton products, Norton AntiVirus relies on Internet Explorer's web interface, instead of using the standard GUI libraries. Besides using more resources, any problems or changes to Internet Explorer will be reflected in Norton products, commonly resulting in "Script Error" messages when the user opens or uses a Norton program.
What is Spybot?
*Spybot - Search & Destroy (often Spybot-S&D) is a popular malware, spyware and adware removal program which works on Microsoft Windows 95 and later. Like most malware scanners, Spybot-S&D scans the computer hard disk and/or RAM for malicious software.
What is Ad-ware?
* Adware- is considered to go beyond the reasonable advertising that one might expect from freeware or shareware. Typically a separate program that is installed at the same time as a shareware or similar program, adware will usually continue to generate advertising even when the user is not running the origianlly desired program.
What is google toolbar?
*Google tool bar- feature introduced this week is rekindling a debate over who should control what appears on a Web page—the site's creator or the software used to view it.
Whats is a firewall?
What is a firewall?
*firewall- is an information technology (IT) security device which is configured to permit, deny or proxy data connections set and configured by the organization's security policy. Firewalls can either be hardware and/or software based.
What is a Private IP Address?
*private IP Address- is a network that uses RFC 1918 IP address space. Computers may be allocated addresses from this address space when it is necessary for them to communicate with other computing devices on an internal (non-Internet) network but not directly with the Internet.
*firewall- is an information technology (IT) security device which is configured to permit, deny or proxy data connections set and configured by the organization's security policy. Firewalls can either be hardware and/or software based.
What is a Private IP Address?
*private IP Address- is a network that uses RFC 1918 IP address space. Computers may be allocated addresses from this address space when it is necessary for them to communicate with other computing devices on an internal (non-Internet) network but not directly with the Internet.
Thursday, April 12, 2007
What is ERD commander?
What is ERD commander?
*ERD Commander - is an ERD-creation tool from Winternals Software and might be the best tool for creating an ERD
What are the major functions of ERD commander?
*
What is configsafe?
*ConfigSafe-logs changes users make to system files, crucial directories, and the Registry. You can then use the logged information to instruct ConfigSafe to restore your system to a previous configuration.
What are the functions?
*
*ERD Commander - is an ERD-creation tool from Winternals Software and might be the best tool for creating an ERD
What are the major functions of ERD commander?
*
What is configsafe?
*ConfigSafe-logs changes users make to system files, crucial directories, and the Registry. You can then use the logged information to instruct ConfigSafe to restore your system to a previous configuration.
What are the functions?
*
Wednesday, April 11, 2007
What is Dr. Watson?
*Dr. Watson- is an application debugger included with the operating system. It is usually named drwatson.exe, drwtsn32.exe or dwwin.exe depending on the version of Windows. It is named after Doctor Watson of Sherlock Holmes fame, with the idea being that it would collect information (symptoms) following the problem (affliction).
Tuesday, April 10, 2007
what is linux
What is linux?
*Linux- is a Unix-like computer operating system family. Linux is one of the most prominent examples of free software and of open source development; its underlying source code is available for anyone to use, modify, and redistribute freely
*Linux- is a Unix-like computer operating system family. Linux is one of the most prominent examples of free software and of open source development; its underlying source code is available for anyone to use, modify, and redistribute freely
Monday, April 9, 2007
What is the O.S. for novell
What is novell?
*Novell- A prominentnetwork software company. Its flagship product, Netware, has been a corporate standard for building local-area networks (LANs) for more than a decade. Novell was founded in 1983.
*Novell- A prominentnetwork software company. Its flagship product, Netware, has been a corporate standard for building local-area networks (LANs) for more than a decade. Novell was founded in 1983.
What is Plug & Play?
*Plug and play is a computer feature that allows the addition of a new device, normally a peripheral, without requiring reconfiguration or manual installation of device drivers. This concept should not be confused with the specific branded ISA add-on technology marketed by Intel and Microsoft.Modern plug-and-play includes both the traditional boot-time assignment of I/O addresses and interrupts to prevent conflicts and identify drivers as well as hotplug systems such as USB and Firewire.
Tuesday, March 27, 2007
What is DHCP?
What is DHCP?
*DHCP (Dynamic Host Configuration Protocol)- is a protocol that lets network administrators manage centrally and automate the assignment of IP (Internet Protocol) configurations on a computer network.
What is DHCP server?
* A DHCP server is an Internet host that returns configuration parameters to DHCP clients.
What are two commands to reconfigure the connection to DHCP server?
*
*DHCP (Dynamic Host Configuration Protocol)- is a protocol that lets network administrators manage centrally and automate the assignment of IP (Internet Protocol) configurations on a computer network.
What is DHCP server?
* A DHCP server is an Internet host that returns configuration parameters to DHCP clients.
What are two commands to reconfigure the connection to DHCP server?
*
Monday, March 26, 2007
What is 'safe mode' used for and why?
*Safe Mode- is an alternate way of starting a computer using only the bare minimum of resources.
*It's a troubleshooting tool built into indows based operating systems
*It's a troubleshooting tool built into indows based operating systems
Tuesday, March 20, 2007
what is windows registry structure?
What is windows registry structure?
*Windows Registry Structure - is when you open it up with a Registry Editor utility like REGEDIT.EXE or REGEDT32.EXE. If you’ve never opened the Registry before, you might be surprised and comforted by its familiar-looking layout. Its hierarchical data structure is much like the data structure you see everyday in Windows Explorer, except here the tree structure units are keys, subkeys, and values rather than directories, subdirectories, and files.
*Windows Registry Structure - is when you open it up with a Registry Editor utility like REGEDIT.EXE or REGEDT32.EXE. If you’ve never opened the Registry before, you might be surprised and comforted by its familiar-looking layout. Its hierarchical data structure is much like the data structure you see everyday in Windows Explorer, except here the tree structure units are keys, subkeys, and values rather than directories, subdirectories, and files.
Monday, March 19, 2007
What is win.ini?
What is win.ini?
*Win.ini- is a text file and can simply be edited to add or remove these items.
*Win.ini- is a text file and can simply be edited to add or remove these items.
Thursday, March 15, 2007
What are the boot issues?
What is startup file?
* Startup file- is a generalization of the HFS boot blocks, one that provides a much larger, variable-sized amount of storage.
Where can you find them?
*Registry- Windows operating system
*Startup folder-
1. Registry: Local Machine
2. Startup folder: documents and settings/All user
3. Win.inni: sysedit
* Startup file- is a generalization of the HFS boot blocks, one that provides a much larger, variable-sized amount of storage.
Where can you find them?
*Registry- Windows operating system
*Startup folder-
1. Registry: Local Machine
2. Startup folder: documents and settings/All user
3. Win.inni: sysedit
Wednesday, March 14, 2007
What is dual booting?
What is dual booting?
*Dual booting- is the act of installing multiple operating systems on a computer, and being able to choose which one to boot when switching on the computer power. The program which makes dual booting possible is called a boot loader.
*Dual booting- is the act of installing multiple operating systems on a computer, and being able to choose which one to boot when switching on the computer power. The program which makes dual booting possible is called a boot loader.
Difference Between windows xp and windows 9x
What are the difference between windows 9x and windows xp?
* Windows 9x- is a term used to describe the DOS-based Microsoft Windows operating systems, Windows 95, Windows 98, and Windows Me, which were produced in the 1990s.
*Windows NT- is a family of operating systems produced by Microsoft, the first version of which was released in July 1993. It was originally designed to be a powerful high-level language-based processor-independent multiprocessing multiuser operating system with features comparable to Unix to complement workstation versions of Windows that were based on MS-DOS until 2001.
*Why windows XP belongs to NT family??
*Windows XP- is the successor to both Windows 2000 and Windows Me, and is the first consumer-oriented operating system produced by Microsoft to be built on the Windows NT kernel and architecture.
* Windows 9x- is a term used to describe the DOS-based Microsoft Windows operating systems, Windows 95, Windows 98, and Windows Me, which were produced in the 1990s.
*Windows NT- is a family of operating systems produced by Microsoft, the first version of which was released in July 1993. It was originally designed to be a powerful high-level language-based processor-independent multiprocessing multiuser operating system with features comparable to Unix to complement workstation versions of Windows that were based on MS-DOS until 2001.
*Why windows XP belongs to NT family??
*Windows XP- is the successor to both Windows 2000 and Windows Me, and is the first consumer-oriented operating system produced by Microsoft to be built on the Windows NT kernel and architecture.
Friday, March 9, 2007
What is DNS
* Domain name system- (DNS) stores and associates many types of information with domain names; most importantly, it translates domain names (computer hostnames) to IP addresses. It also lists mail exchange servers accepting e-mail for each domain. In providing a worldwide keyword-based redirection service, DNS is an essential component of contemporary Internet use.
* Top-level domain- (TLD) is the last part of an Internet domain name; that is, the letters which follow the final dot of any domain name. For example, in the domain name www.website.com, the top-level domain is com (or COM, as domain names are not case-sensitive).
* Hostname- (occasionally also, a sitename) is the unique name by which a network attached device (which could consist of a computer, file server, network storage device, fax machine, copier, cable modem, etc.) is known on a network. The hostname is used to identify a particular host in various forms of electronic communication such as the World Wide Web, e-mail or Usenet.
* Top-level domain- (TLD) is the last part of an Internet domain name; that is, the letters which follow the final dot of any domain name. For example, in the domain name www.website.com, the top-level domain is com (or COM, as domain names are not case-sensitive).
* Hostname- (occasionally also, a sitename) is the unique name by which a network attached device (which could consist of a computer, file server, network storage device, fax machine, copier, cable modem, etc.) is known on a network. The hostname is used to identify a particular host in various forms of electronic communication such as the World Wide Web, e-mail or Usenet.
Thursday, March 8, 2007
3-8-07 Networking Port
*FTP-Port # 20, and 21/data used for transferrring files and control used for transferring files
telnet-Port # 23/used to gain remote control over machine on the network
*DNS-Port #53/Domain Name Service, provides FQDN to IP
*HTTP-Port # 80/Hyoertext Transfer Protocol, transfer HTML files(web pages)
*POP3-Port # 110/Post Office Protocol 3, used for e-mail server to client
*HTTPS-Port # 443/ Hypertext Transfer Protocol Secure, used for transfer secure HTml files
telnet-Port # 23/used to gain remote control over machine on the network
*DNS-Port #53/Domain Name Service, provides FQDN to IP
*HTTP-Port # 80/Hyoertext Transfer Protocol, transfer HTML files(web pages)
*POP3-Port # 110/Post Office Protocol 3, used for e-mail server to client
*HTTPS-Port # 443/ Hypertext Transfer Protocol Secure, used for transfer secure HTml files
Tuesday, March 6, 2007
Install windows 98
What is windows update?
* Windows Update is the online extension of Windows that helps you to keep your computer up-to-date. Use Windows Update to choose updates for your computer's operating system, software, and hardware.
What is system restore?
* System Restore is a component of Microsoft's Windows Me and Windows XP operatin systems that allows for the rolling back of system files, registry keys, installed programs, etc., to a previous state in the event of a failure.
* Windows Update is the online extension of Windows that helps you to keep your computer up-to-date. Use Windows Update to choose updates for your computer's operating system, software, and hardware.
What is system restore?
* System Restore is a component of Microsoft's Windows Me and Windows XP operatin systems that allows for the rolling back of system files, registry keys, installed programs, etc., to a previous state in the event of a failure.
Monday, March 5, 2007
Introduction on Microsofts
what is the process to install windows xp?
Find the step by step introduction on Microsoft's web site?
* There are no fewer than five places where the country/language/keyboard layout must be set. With most versions of Linux it is usual for the country to be specified early in the install process, and then the user is asked to confirm this choice (instead of selecting from a long dropdown list) when it comes to specifying language, keyboard layout etc. The regional settings section is also very poorly laid out and inexperienced users (which means most people since an average user rarely performs a Windows reinstallation) often don’t realise that the country selection has to be made several times and end up with a computer set for "US English" keyboard layout even when they live outside the USA.
* The choice of default timezone setting (UTC -8, the timezone of the US state where Microsoft's head office is based), when a far more logical default option would be UTC, or even the most populous timezone of the country the computer is to be used in (which is specified earlier in the install process).
* The choice of "Letter" rather than "A4" as a default printer setting even when the installation is configured for use outside the USA (where ISO standard paper size predominate).
Find the step by step introduction on Microsoft's web site?
* There are no fewer than five places where the country/language/keyboard layout must be set. With most versions of Linux it is usual for the country to be specified early in the install process, and then the user is asked to confirm this choice (instead of selecting from a long dropdown list) when it comes to specifying language, keyboard layout etc. The regional settings section is also very poorly laid out and inexperienced users (which means most people since an average user rarely performs a Windows reinstallation) often don’t realise that the country selection has to be made several times and end up with a computer set for "US English" keyboard layout even when they live outside the USA.
* The choice of default timezone setting (UTC -8, the timezone of the US state where Microsoft's head office is based), when a far more logical default option would be UTC, or even the most populous timezone of the country the computer is to be used in (which is specified earlier in the install process).
* The choice of "Letter" rather than "A4" as a default printer setting even when the installation is configured for use outside the USA (where ISO standard paper size predominate).
Friday, March 2, 2007
Thursday, March 1, 2007
Requirements Of Windows XP
*PC with 300 megahertz or higher processor clock speed recommended; 233 MHz minimum required
*128 megabytes (MB) of RAM or higher recommended (64 MB minimum supported; may limit performance and some features)
*1.5 gigabytes (GB) of available hard disk space
*Super VGA (800 x 600) or higher-resolution video adapter and monitor
*CD-ROM or DVD drive
*Keyboard and Microsoft Mouse or compatible pointing device
*128 megabytes (MB) of RAM or higher recommended (64 MB minimum supported; may limit performance and some features)
*1.5 gigabytes (GB) of available hard disk space
*Super VGA (800 x 600) or higher-resolution video adapter and monitor
*CD-ROM or DVD drive
*Keyboard and Microsoft Mouse or compatible pointing device
Property of TCP/ IP
*IP Address- IP address (Internet Protocol address) is a unique address that certain electronic devices use in order to identify and communicate with each other on a computer network utilizing the Internet Protocol standard (IP)—in simpler terms, a computer address.
*Subnet mask- is a range of logical addresses within the address space that is assigned to an organization.
*Default gateway- is a node (a router) on a computer network that serves as an access point to another network.
*Address Resolution Protocol (ARP)- is the method for finding a host's hardware address when only its network layer address is known.
*Subnet mask- is a range of logical addresses within the address space that is assigned to an organization.
*Default gateway- is a node (a router) on a computer network that serves as an access point to another network.
*Address Resolution Protocol (ARP)- is the method for finding a host's hardware address when only its network layer address is known.
Wednesday, February 28, 2007
5 layers of TCP App
*DHCP-The Dynamic Host Configuration Protocol (DHCP) is a set of rules used by a communications device such as a computer, router or network adapter to allow the device to request and obtain an IP address from a server which has a list of addresses available for assignment.
*DNS-the domain name system (DNS) stores and associates many types of information with domain names; most importantly, it translates domain names computer hostnames to IP addresses.
*IRC-Internet Relay Chat (IRC) is a form of real-time Internet chat or synchronous conferencing. It is mainly designed for group many-to-many communication in discussion forums called channels, but also allows one-to-one communication and data transfers via private message.
*SIP-The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol for creating, modifying, and terminating sessions with one or more participants. These sessions include Internet telephone calls, multimedia distribution, and multimedia conferences."
*NNTP-The Network News Transfer Protocol or NNTP is an Internet application protocol used primarily for reading and posting Usenet articles, as well as transferring news among news servers.
*DNS-the domain name system (DNS) stores and associates many types of information with domain names; most importantly, it translates domain names computer hostnames to IP addresses.
*IRC-Internet Relay Chat (IRC) is a form of real-time Internet chat or synchronous conferencing. It is mainly designed for group many-to-many communication in discussion forums called channels, but also allows one-to-one communication and data transfers via private message.
*SIP-The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol for creating, modifying, and terminating sessions with one or more participants. These sessions include Internet telephone calls, multimedia distribution, and multimedia conferences."
*NNTP-The Network News Transfer Protocol or NNTP is an Internet application protocol used primarily for reading and posting Usenet articles, as well as transferring news among news servers.
Monday, February 26, 2007
This is the Skills for a computer programmer
This is the Skills for a computer programmer
* Reprogramming PC's
* Multi-tasking
* Must have computer knowledge
* Strong Windows XP and network skills
*Ability to Work With Multi-Language Programming Projects
*Knowledge of Software Development Tools
*Knowledge of Operating Systems
* Reprogramming PC's
* Multi-tasking
* Must have computer knowledge
* Strong Windows XP and network skills
*Ability to Work With Multi-Language Programming Projects
*Knowledge of Software Development Tools
*Knowledge of Operating Systems
Thursday, February 15, 2007
Security
What account has the full control of the computer?
*
What is Active Directory?
*Active Directory is an implementation of LDAP directory services by Microsoft for use in Windows environments. Active Directory allows administrators to assign enterprise-wide policies, deploy programs to many computers, and apply critical updates to an entire organization
What permission can be set to a file?
*
What permission can be set to a folder?
*
*
What is Active Directory?
*Active Directory is an implementation of LDAP directory services by Microsoft for use in Windows environments. Active Directory allows administrators to assign enterprise-wide policies, deploy programs to many computers, and apply critical updates to an entire organization
What permission can be set to a file?
*
What permission can be set to a folder?
*
What is NetBios/NetBeui
What is NetBIOS?
*NetBIOS is an acronym for Network Basic Input/Output System. The NetBIOS API allows applications on separate computers to communicate over a local area network.
What is NetBEUI?
*NetBIOS Extended User Interface is an unrouted network- and transport-level data protocol most commonly used as one of the layers of Microsoft Windows networking.
How does it work? TCP/IP
*In modern networks, it normally runs over TCP/IP (NBT), giving each computer in the network both a NetBIOS name and an IP address corresponding to a (possibly different) host name.
*NetBIOS is an acronym for Network Basic Input/Output System. The NetBIOS API allows applications on separate computers to communicate over a local area network.
What is NetBEUI?
*NetBIOS Extended User Interface is an unrouted network- and transport-level data protocol most commonly used as one of the layers of Microsoft Windows networking.
How does it work? TCP/IP
*In modern networks, it normally runs over TCP/IP (NBT), giving each computer in the network both a NetBIOS name and an IP address corresponding to a (possibly different) host name.
Tuesday, February 13, 2007
Monday, February 12, 2007
Tools and System Restore
*Scan Disk-is used to check your hard drive for errors. If it finds an error, it attempts (usually successfully) to fix it.
*Disk cleanup-is a small disk utility designed to clear previously deleted files. Deleting a file will normally just remove the file's directory entry, but the data itself still remains on the disk. CleanUp will completely eliminate the contents of your deleted files.
*Defragmenter-is a computer program designed to increase access speed (and sometimes increase the amount of usable space) by rearranging files stored on a disk to occupy contiguous storage locations.
*Backup-in computer engineering refers to the copying of data for the purpose of having an additional copy of an original source. If the original data is damaged or lost, the data may be copied back from that source, a process which is known as Data recovery or Restore.
*What is system restore?
System Restore-is a component of Microsoft's Windows Me and Windows XP operating systems that allows for the rolling back of system files, registry keys, installed programs, etc., to a previous state in the event of a failure.
*Disk cleanup-is a small disk utility designed to clear previously deleted files. Deleting a file will normally just remove the file's directory entry, but the data itself still remains on the disk. CleanUp will completely eliminate the contents of your deleted files.
*Defragmenter-is a computer program designed to increase access speed (and sometimes increase the amount of usable space) by rearranging files stored on a disk to occupy contiguous storage locations.
*Backup-in computer engineering refers to the copying of data for the purpose of having an additional copy of an original source. If the original data is damaged or lost, the data may be copied back from that source, a process which is known as Data recovery or Restore.
*What is system restore?
System Restore-is a component of Microsoft's Windows Me and Windows XP operating systems that allows for the rolling back of system files, registry keys, installed programs, etc., to a previous state in the event of a failure.
Thursday, February 8, 2007
What are the 2 components inside boots sector?
What is MBR?
*A master boot record (MBR) is the first sector ("sector zero") of a data storage device such as a hard disk. It is sometimes used for bootstrapping operating systems, sometimes used for holding a disc's partition table, and sometimes used for uniquely identifying individual disc media; although on some machines it is entirely unused and ignored.
What are the 2 ways to format a disk?
What is MBR?
*A master boot record (MBR) is the first sector ("sector zero") of a data storage device such as a hard disk. It is sometimes used for bootstrapping operating systems, sometimes used for holding a disc's partition table, and sometimes used for uniquely identifying individual disc media; although on some machines it is entirely unused and ignored.
What are the 2 ways to format a disk?
Structured Cabling
What are the 3 types of materials that are available for cabling?
*PVC
*Plenum
*Riser
What are the 2 standards for crimping?
*Wires line up to EIA/TIA 568A
*PVC
*Plenum
*Riser
What are the 2 standards for crimping?
*Wires line up to EIA/TIA 568A
Friday, February 2, 2007
What are physical components?
What are physical components?
Hub switch- is sometimes used to refer to any piece of network equipment that connects PCs together, but it actually refers to a multi-port repeater.
Network card- a piece of computer hardware designed to allow computers to communicate over a computer network.
What are the brand for each?
What standard does it follow?
Hub switch- is sometimes used to refer to any piece of network equipment that connects PCs together, but it actually refers to a multi-port repeater.
Network card- a piece of computer hardware designed to allow computers to communicate over a computer network.
What are the brand for each?
What standard does it follow?
Thursday, February 1, 2007
100 B T
What is the speed of it?
*100 mbs
What is the switch?
Switch- is a computer networking device that connects network segments. It uses the logic of a Network bridge but allows a phyisical and logical star topology. It is often used to replace network hubs.
10GB-T What is it?
*100 mbs
What is the switch?
Switch- is a computer networking device that connects network segments. It uses the logic of a Network bridge but allows a phyisical and logical star topology. It is often used to replace network hubs.
10GB-T What is it?
Wednesday, January 31, 2007
10 Based 5
1. 10 Based 5
*10 stands for 10 Mbps
*Base stands for baseband
*5 stands for segment may not be longer than 500 meters
What is CSMA/CD?
*CSMA/CD - is a carrier sensing scheme is used and
a transmitting data station that detects another signal while transmitting a frame, stops transmitting that frame, transmits a jam signal.
10 Based T
*T stands for Twisted pair
*10 stands for 10 Mbps
*Base stands for baseband
*5 stands for segment may not be longer than 500 meters
What is CSMA/CD?
*CSMA/CD - is a carrier sensing scheme is used and
a transmitting data station that detects another signal while transmitting a frame, stops transmitting that frame, transmits a jam signal.
10 Based T
*T stands for Twisted pair
Tuesday, January 30, 2007
Notes 7 layer model ?'s
What is netstat command for?
*The NETSTAT command is designed to help you quickly determine whether or not TCP/IP is working correctly. If TCP/IP is having problems, then NETSTAT can help you to determine where the problem is.
What is VPN?
*A virtual private network (VPN) is a private communications network often used within a company, or by several companies or organizations, to communicate confidentially over a public network.
What are 7 layers of OSI model?
*Application
*Presentation
*Session
*Transport
*Network
*Data-link
*Physical
*The NETSTAT command is designed to help you quickly determine whether or not TCP/IP is working correctly. If TCP/IP is having problems, then NETSTAT can help you to determine where the problem is.
What is VPN?
*A virtual private network (VPN) is a private communications network often used within a company, or by several companies or organizations, to communicate confidentially over a public network.
What are 7 layers of OSI model?
*Application
*Presentation
*Session
*Transport
*Network
*Data-link
*Physical
Monday, January 29, 2007
ADD and COPY
What are the commands to copy,rename,delete,and move a file?
*Explorer Buddy extends the capabilities of the Windows Explorer by adding a context menu to the detail view. The user can select and manipulate files by using wildcard expressions, even recursively into sub-folders. Problems that may arise during lengthy file operations are anticipated and taken care of before operations start. Batch operations run without interruptions by message boxes that the operating system might otherwise pop up.
How do we find the attribute of a file?
*Each file is stored in a directory, and uses a directory entry that describes its characteristics such as its name and size. The directory entry also contains a pointer to where the file is stored on disk. One of the characteristics stored for each file is a set of file attributes that give the operating system and application software more information about the file and how it is intended to be used.
How do we launch a program?
*this program is a Quick Launch substitute. This feature (Quick Launch) that is present in all Windows operating systems isn't very popular with computer users because it is not very helpful and takes too long and too much effort to access. Launch Express, on the other hand, uses "one-click away" rule. This means that with Launch Express you can launch any program, access any document or open any folder (including special folders, like My Computer or Control Panel) with just one click.
*Explorer Buddy extends the capabilities of the Windows Explorer by adding a context menu to the detail view. The user can select and manipulate files by using wildcard expressions, even recursively into sub-folders. Problems that may arise during lengthy file operations are anticipated and taken care of before operations start. Batch operations run without interruptions by message boxes that the operating system might otherwise pop up.
How do we find the attribute of a file?
*Each file is stored in a directory, and uses a directory entry that describes its characteristics such as its name and size. The directory entry also contains a pointer to where the file is stored on disk. One of the characteristics stored for each file is a set of file attributes that give the operating system and application software more information about the file and how it is intended to be used.
How do we launch a program?
*this program is a Quick Launch substitute. This feature (Quick Launch) that is present in all Windows operating systems isn't very popular with computer users because it is not very helpful and takes too long and too much effort to access. Launch Express, on the other hand, uses "one-click away" rule. This means that with Launch Express you can launch any program, access any document or open any folder (including special folders, like My Computer or Control Panel) with just one click.
Mac Address
Mac Address-is a unique identifier attached to most network adapters. It is a number that acts like a name for a particular network adapter.
Hub- is part of the network that links computers to one another.
IP address- is a unique address that devices use in order to identify and communicate with each other on a computer network utilizing the Internet Protocol standard in simpler terms, a computer address.
Router-is a computer networking device that forwards data packets across a network toward their destinations, through a process known as routing.
Hub- is part of the network that links computers to one another.
IP address- is a unique address that devices use in order to identify and communicate with each other on a computer network utilizing the Internet Protocol standard in simpler terms, a computer address.
Router-is a computer networking device that forwards data packets across a network toward their destinations, through a process known as routing.
Types of Circuits
Types of Circuits
1. Series
2. Parallel
Methods of Generating Electricity
Hydroelectric plants- use moving water over dams to turn turbines in generators to produce electricity
Solar Collectors- are devices which gather the energy from the sun and convert it into electric energy.
Windmills-produce energy by using wind to turn turbines in a generator
Thermonuclear plants- produce electricity by using a nuclear reation to super heat water with radiation.
Piezoelectricity- is produced by exerting pressure on a quartz crystal.
1. Series
2. Parallel
Methods of Generating Electricity
Hydroelectric plants- use moving water over dams to turn turbines in generators to produce electricity
Solar Collectors- are devices which gather the energy from the sun and convert it into electric energy.
Windmills-produce energy by using wind to turn turbines in a generator
Thermonuclear plants- produce electricity by using a nuclear reation to super heat water with radiation.
Piezoelectricity- is produced by exerting pressure on a quartz crystal.
Friday, January 26, 2007
How do we use prompt?
What command is to view directions?
What command is to got to a directory?
How u delete a directory and create
What command is to got to a directory?
How u delete a directory and create
Communications Basics
Communications Basics
Common Carriers: Inter exchange carriers, local exchange carriers, competitive local exchange carriers.
Local loop(regulated in the past-now deregulated with the Telecom Act of 1996).
Federal communications commission(FCC)
Public Switch Telephone Network (PSTN)
Plain old Telephone service (POTS)
Circuit Swithching
Dedicated communications path established for the duration of the conversation
E.G. telephone network
Packet Switching
Small chunks(packets) of data at a time
Packets passed from node to node between source and destination
Used for terminal to computer and computer to computer communications
Common Carriers: Inter exchange carriers, local exchange carriers, competitive local exchange carriers.
Local loop(regulated in the past-now deregulated with the Telecom Act of 1996).
Federal communications commission(FCC)
Public Switch Telephone Network (PSTN)
Plain old Telephone service (POTS)
Circuit Swithching
Dedicated communications path established for the duration of the conversation
E.G. telephone network
Packet Switching
Small chunks(packets) of data at a time
Packets passed from node to node between source and destination
Used for terminal to computer and computer to computer communications
Thursday, January 25, 2007
What is Topology?
Network topology- The specific physical, i.e., real, or logical, i.e., virtual, arrangement of the elements of a network. Two networks have the same topology if the connection configuration is the same, although the networks may differ in physical interconnections, distances between nodes, transmission rates, and signal types.
bus topology- A network topology in which all nodes, i.e., stations, are connected together by a single bus.
hybrid topology- A combination of any two or more network topologies. Note 1: Instances can occur where two basic network topologies, when connected together, can still retain the basic network character, and therefore not be a hybrid network.
mesh topology- A network topology in which there are at least two nodes with two or more paths between them.
ring topology- A network topology in which every node has exactly two branches connected to it.
star topology- A network topology in which peripheral nodes are connected to a central node, which rebroadcasts all transmissions received from any peripheral node to all peripheral nodes on the network, including the originating node.
tree topology- A network topology that, from a purely topologic viewpoint, resembles an interconnection of star networks in that individual peripheral nodes are required to transmit to and receive from one other node only, toward a central node, and are not required to act as repeaters or regenerators.
bus topology- A network topology in which all nodes, i.e., stations, are connected together by a single bus.
hybrid topology- A combination of any two or more network topologies. Note 1: Instances can occur where two basic network topologies, when connected together, can still retain the basic network character, and therefore not be a hybrid network.
mesh topology- A network topology in which there are at least two nodes with two or more paths between them.
ring topology- A network topology in which every node has exactly two branches connected to it.
star topology- A network topology in which peripheral nodes are connected to a central node, which rebroadcasts all transmissions received from any peripheral node to all peripheral nodes on the network, including the originating node.
tree topology- A network topology that, from a purely topologic viewpoint, resembles an interconnection of star networks in that individual peripheral nodes are required to transmit to and receive from one other node only, toward a central node, and are not required to act as repeaters or regenerators.
Monday, January 22, 2007
"NEW VIDEOS"
2 types of video format and their names
-HDDVD VS BLU-RAY
What companies are working each?
-t
-HDDVD VS BLU-RAY
What companies are working each?
-t
Thursday, January 18, 2007
OPERATING SYSTEMS
What are 3 types of operating system?
1. Standalone
2. Networked
3. Embedded
Standalone- is a complete system workson desktops, notebook or mobile computing devices.
Standalone OS'S include
DO S, Windows,Macos,OS/2WarpClient,Unix,Linux
Windows XP comes in 3 edition consumer edition XP Home Edition Croporatedition
1. Standalone
2. Networked
3. Embedded
Standalone- is a complete system workson desktops, notebook or mobile computing devices.
Standalone OS'S include
DO S, Windows,Macos,OS/2WarpClient,Unix,Linux
Windows XP comes in 3 edition consumer edition XP Home Edition Croporatedition
Wednesday, January 17, 2007
Research
WHAT IS DSL?
DSL (Digital Subscriber Line) is a technology for bringing high-bandwidth information to homes and small businesses over ordinary copper telephone lines.
HOW IT WORK?
Traditional phone service (sometimes called POTS for "plain old telephone service") connects your home or small business to a telephone company office over copper wires that are wound around each other and called twisted pair. Traditional phone service was created to let you exchange voice information with other phone users and the type of signal used for this kind of transmission is called an analog signal.
WHAT IS CABLE MODEM?
A cable modem is a type of modem that provides access to a data signal sent over the cable television infrastructure. Cable modems are primarily used to deliver broadband Internet access, taking advantage of unused bandwidth on a cable television network.
DSL and Cable modem is broadband.
Cable modem cost more, but DSL cost less.
Cablem modem is faster than DSL.
DSL (Digital Subscriber Line) is a technology for bringing high-bandwidth information to homes and small businesses over ordinary copper telephone lines.
HOW IT WORK?
Traditional phone service (sometimes called POTS for "plain old telephone service") connects your home or small business to a telephone company office over copper wires that are wound around each other and called twisted pair. Traditional phone service was created to let you exchange voice information with other phone users and the type of signal used for this kind of transmission is called an analog signal.
WHAT IS CABLE MODEM?
A cable modem is a type of modem that provides access to a data signal sent over the cable television infrastructure. Cable modems are primarily used to deliver broadband Internet access, taking advantage of unused bandwidth on a cable television network.
DSL and Cable modem is broadband.
Cable modem cost more, but DSL cost less.
Cablem modem is faster than DSL.
Tuesday, January 16, 2007
*Information is generated by a source. It is converted into an electronic signal by coding into machine readable from. The output is known as a signal.
*The siganl is applied to a medium. Medium carried this via electromagnetic waves and delivers it ti the receiver.
*Receiver accepts the signal or info
*Terminology Reference
Transmission Types
*Analogy(telephone Network)
DTE-DCE-POTS
DCE-DCE
*Digital
DTE
Analog-continous fluctuations over time between high and low lengths.
Digital-Discrete states(voltages,levels
Binary-if limited to two
Frequency- the number of timesper second a continous wave completes one cycle
Amplitude-the difference of the extremes from the midpoint in a cycle
Phase-the angular position of a wave
*The siganl is applied to a medium. Medium carried this via electromagnetic waves and delivers it ti the receiver.
*Receiver accepts the signal or info
*Terminology Reference
Transmission Types
*Analogy(telephone Network)
DTE-DCE-POTS
DCE-DCE
*Digital
DTE
Analog-continous fluctuations over time between high and low lengths.
Digital-Discrete states(voltages,levels
Binary-if limited to two
Frequency- the number of timesper second a continous wave completes one cycle
Amplitude-the difference of the extremes from the midpoint in a cycle
Phase-the angular position of a wave
Friday, January 12, 2007
Networks and the Internet
-a network is collection of computers and devices connected together via communications.
The reason to networks
-Hardware devices
-To share resources
-Software programs
-Data
-Information
Local area network(LAN)
-a network that connects computers in a limited geographic area such as a school computer laboratory office or group buildings.
Categories of Computers
-Personal computers
-Mobile devices/Computers
-Mid-range computers
-Mainframes
-Supercomputers
-a network is collection of computers and devices connected together via communications.
The reason to networks
-Hardware devices
-To share resources
-Software programs
-Data
-Information
Local area network(LAN)
-a network that connects computers in a limited geographic area such as a school computer laboratory office or group buildings.
Categories of Computers
-Personal computers
-Mobile devices/Computers
-Mid-range computers
-Mainframes
-Supercomputers
Wednesday, January 10, 2007
Components of a computer Hardware:
system unit, monitor, scanner, speakers,keyboard
Computer hardware -any part of a computer system that you can see or touch
Computer: CPU and Main Memory
Peripheral: any piece of hardware attached to a computer
Input devices-thing put in computer
Output devices- convey info
Secondary storage devices (CD-Rom etc)
Communication devices
Components of a Motherboard
-CPU or a Processor
-Electric devices that interprets and carries out the basic instruction that operate the computer
-Memory
-Temporary holds info
-Chips
-Storage-holds data
-Compact Disk- Cd that stores data using microscopic which are created by a laser light
-CD-Rom
-DVD-ROM
-CD-RW: rewriteable
DVD: Blu Ray
-Communication Devices:Motor
system unit, monitor, scanner, speakers,keyboard
Computer hardware -any part of a computer system that you can see or touch
Computer: CPU and Main Memory
Peripheral: any piece of hardware attached to a computer
Input devices-thing put in computer
Output devices- convey info
Secondary storage devices (CD-Rom etc)
Communication devices
Components of a Motherboard
-CPU or a Processor
-Electric devices that interprets and carries out the basic instruction that operate the computer
-Memory
-Temporary holds info
-Chips
-Storage-holds data
-Compact Disk- Cd that stores data using microscopic which are created by a laser light
-CD-Rom
-DVD-ROM
-CD-RW: rewriteable
DVD: Blu Ray
-Communication Devices:Motor
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