Networks

Mr Arthur

Aims of Lesson 1

What is a Stand Alone Computer System? What is a Network? Local Area Networks Wide Area Networks

Stand Alone/Networked

A Stand Alone computer system is a computer that is not connected to any other

A network is a linked set of computer systems that are capable of sharing programs, data and sending messages

Local Area Networks

A LAN is a network of computers connected over a small geographical area, usually inside the 1 building

Examples School LAN LAN in your house

Uses Sharing printers

Sharing files and data.

Transmission Media Copper wire, fibre optic, wireless

Wide Area Networks

A WAN is a network of computers over a large geographical area, such as across a country or the world.

Examples The Internet Companies like the BBC communicating across the world

Uses Video-conferencing, use of e-mail, live chat Multi-user databases E-commerce and entertainment

Transmission Media Fibre Optic, Microwave transmission, Satellite links

Advantages of Networks

You can share hardware therefore saving money

They allow you to communicate with people via email, video conferencing etc

You can buy and sell goods online You can share anti virus software You can log on to lots of different stations

and still access your own documents

Aims of Lesson 2

Last Lesson What is a Stand Alone

Computer System? What is a Network? Local Area Networks Wide Area Networks Transmission Media for

LANs and WANs

Today’s Lesson Network Security Client/Server

Networks Network Interface

Cards Freeware/Shareware

Network Security Passwords = Users have passwords to keep their

data secure and prevent unwanted tampering with data

Encryption = putting data into a code to prevent it being intercepted, for example your bank details

Physical Methods Door lock Finger print reader Number keypad Others?

Client/Server Networks

Client/Server Networks Where there are many clients that access files stored

on servers Network Interface card

A NIC is fitted inside a computer system to allow it to communicate with a computer network

Freeware This is software you get for free and there are no

restrictions on copying etc, i.e ITunes Shareware

This is software you get a 30 day trial for and then have to pay for it

Networks = What you need to know! What is a Stand Alone Computer System? What is a Network? Local Area Networks Wide Area Networks Transmission Media for LANs and WANs LANs = Copper wire/Fibre Optic/Wireless WANs = Microwave/Fibre Optic/Satellite Advantages of LANs?

Share hardware Share files Send emails

Network Security Passwords Encryption Physical Methods?

Client/Server Network Network Interface Card

Network Powerpoint

Slide 1 = Covering Slide Slide 2 = Standalone/Network definitition Slide 3 = LANs / Examples and Transmission Media Slide 4 = WANs / Examples and Transmission Media Slide 5 = Advantages of Networks Slide 6 = Network Security Slide 7 = Client/Server and Network Interface Card