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Networks
Mr Arthur
Aims of Lesson 1
1. Standalone/Network
2. LANs Examples/Uses/Transmission Media
3. WANS Examples/Uses/Transmission Media
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 Network in a library
Uses Sharing files Sharing peripherals Email
Transmission Media Copper Wire, Fibre Optic and Wireless
Bandwidth = 10-100Mbps
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 Sharing Information - access to databases, E-commerce and entertainment
Transmission Media Fibre Optic, Microwave transmission and Satellite
Bandwidth = Dial Up 56Kbps/Broadband 20Mbps
Lesson Starter
1. What is the difference between a Standalone station and a Network?
2. Give 3 uses of a LAN
3. Give 2 transmission media that would be used with a WAN
Aims of Lesson 2
Last Lesson Introduce networks LANs WANS
Today’s Lesson
1. Client/Server
2. Advantages of Networks
Client Server Network A client-server network is where you store all files
centrally on a server and have many client stations that can access the files.
Advantages Increased security as each user needs to log in Different levels of access are available Flexible uses of station, you can log on to a number of clients
and access your files Backup copies are completed centrally
Disadvantages If the file server is down there is no access to data
Advantages of Networks
Share files – e.g. RM Shared Share peripherals – printers etc Communication improved – email, livechat Flexibility in using stations Password protect files Centralise backup
Lesson Starter
1. What is a Client Server network?
2. Give 3 advantages of setting up a network
3. Give 1 possible disadvantage
Aims of Lesson 3
Last Lesson Introduce networks LANs WANS Bandwidths Client Server Advantages of
Networks
Today’s Lesson
1. Email Features
2. Internet Theory
Email Features
Sending, reading and replying, Address book Mailing lists – creating groups for example
S1 Reg teachers Folders Signatures – Adding text that will always
appear in emails Attachments – adding a file to an email
World Wide Web A network of computers across the world
Webpages Pages written in Hyper Text Markup Language and saved on a
Webserver
Hyperlinks A piece of text that takes you to another page
Hotspots A link on a pixel
Browser A piece of software that displays webpages in the correct format e.g.
Internet Explorer, Firefox
Search Engine Where you use web crawler software to find items on the web. The
search engine displays an extract of the page and hyperlink
URL Uniform Resource Location = the address of the webpage
Aims of Lesson 5
Last Lesson Introduce networks LANs WANS Bandwidths Client Server Advantages of Networks Email Features Internet Theory
web pages, hyperlinks, browser, search engines
Today’s Lesson Economic Factors Computing Laws
DPA Copyright, Designs and
Patents Computer Misuse Act
Economic Factors Leading to Development of Networks
Falling Cost of Technology Shared Access to Expensive equipment Geographic spread of organisations Demand for up to date information
Computing Laws
Copyright Designs and Patents Act This makes it illegal to copy music, programs, movies
etc without the permission of the owner
Computer Misuse Makes it illegal to hack or spread viruses
Data Protection Act Controls the storage of personal information Data Controller must
Keep data secure Not sell it on Make sure it is accurate and up to date
Arrangements Description of the following features of LANs, WANs and the Internet: transmission
media, bandwidth, geographical spread and functions Description of the functions of a client and server on a network Description of the benefits of networks Description of the following features and functions of e-mail: e-mail address, sending,
reading, replying, setting up an address book, setting up mailing lists, setting up folders
Description of the following features of the World Wide Web: web pages, hyperlinks,
browser, search engines Description of the following economic factors which have led to the development of
computer networks: falling cost of telecommunication technologies and services, shared access to expensive equipment, geographic spread of organisations, demand for up-to date information
Description of the main features of the Computer Misuse Act, the Copyright Designs and Patents Act and the Data Protection Act
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