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LAN's and WAN's

Local area network ans wide area network

Sophie Wells

on 30 March 2011

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Transcript of LAN's and WAN's

LAN's - Local Area Networks Confined to a small area Usually located in small buildings Uses cables, wireless, infared and
microwave links WAN's - Wide Area Networks Cheap to run and build Cover a wide geographical area More expsensive to run and set up. Network is about sharing information Hardware (Printers) Software (Files) Not only computers but used
for games consoles, PDA's, fridges
and phones Can connect to the internet
by many ways Wires Wireless
Has good hotspots
Good for businesses
Teleworking Fibre optics
Very quick as
got good speed 3G Authentication Passwords - For secruity. should use numbers and letters. Username - identify the access of
the individual Encryption - codes messages before sending them over Digital signatures Network Proxy server - It has two main tasks:
Supply authorised internal users with web pages.
Supply external users with authorised information and services.
This then stops access to innapropriate sites Router - is a device that transfers data from one network to another in an intelligent way. It has the task of forwarding data packets to their destination by the most efficient route.
In order to do this, the router has a micro computer inside it. This holds a table in memory that contains a list of all the networks it is connected to, along with the latest information on how busy each path in the network is, at that moment. This is called the 'routing table'.
When a data packet arrives, the router does the following:-
Reads the data packet's destination address
Looks up all the paths it has available to get to that address.
Checks on how busy each path is at the moment
Sends the packet along the least congested (fastest) path.
Packets - The individual units of data. (includes sender and recipient ID) Bandwidth - Measure of network speed ( HIgh = fast) Firewall - Protects the local network. Ports - Access point to a network. Adds control to the task carrying it out Server - Analyses a packets. Where webpages are saved. HTTP - Hypertext transfer protocol FTP- File Transfer Protocol
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