3.3 Data Networks

Overview

Identify the main differences between LAN and WAN.Identify the advantages of using a network over

stand-alone computers. Describe the function of a range of network

resources: network interface card, network cables, switch, router.

Describe the need for network communication.

LAN

• Local Area Network• Covers a small

geographical area

WAN

• Wide Area Network• Covers a wide

geographical area

Network v Stand-aloneNetwork• Shared peripherals• Easier communication• Usually cheaper software

via licences• Files can be accessed from

any computer• Software easier to install in

bulk• Better monitoring of

security

Stand-alone• Usually more expensive due

to attached peripherals• Software has to be installed

on each machine

Network interface card

• A card that is slotted into a computer motherboard that allows other computers to connect to it.

Switch• A hardware device that acts as a single point to

connect a group of computers.• Each computer, including the server, has cables

connected to the switch.• The switch organises the communication between

the computers.

Router• A hardware device

which connects two or more networks together.

• It works out the best route for each packet of data to travel along.

• A router is needed to send and receive data from the Internet to a computer.

Acronyms

• LAN Local Area Network• WAN Wide Area Network

Activity

Draw the network configuration that exists in your school.