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

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

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.

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.

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.

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

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

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.

"NEW VIDEOS"

2 types of video format and their names

-HDDVD VS BLU-RAY


What companies are working each?

-t

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

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.

*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

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

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

Carmelo Anthony

DUKE BLUEDEVILS

Impossible is Nothin

Believe for what u believe in. Don't list to other people that bring you down.