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3.1.1 Network Resources, Describe networks by their scope: LAN, MAN and…
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Describe networks by their scope: LAN, MAN and WAN
What is a Network?
Definition A linked set of computer systems, which may be capable of sharing computer power and resources such as printers, files storage and databases.
In a computer network a number of computers are connected together in order to exchange information.
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Types of Networks Networks can be descried by their scope (the distance that they are connected over) THREE main types are:
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LAN - Local Area Network
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Advantages
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Security
Usernames and Passwords are required to log on, this identifies you to the network so it can show you the files which belongs to you
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Disadvantages
Slow Service
The more people log on and instructions such as print jobs that are given to the network the slower it becomes
Cost
Hardware required to network computers - Cables/Wireless technology, NIC, Hubs, Switches, Rounters
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Expert Support Required
Network Manager or Technician is required to ensure all components are working properly and efficiently and fix problems if they occur.
Viruses
If virus gets onto network it will spread around all the computers very quickly causing damage to files or the efficiency of the network
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Key Characteristics
Security - Can be kept fairly high as security can be controlled and updated centrally and regularly.
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Connection Method - Can be copper cables, coaxial cables, twisted cables, fibre-optic cables or radio waves.
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WAN - Wide Area Network
Definition Computers are linked across cities and even countries and are connected by telephone lines and/or radio waves.
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Biggest WAN - Internet Back ATMs are connected to a WAN to allow the machines to communicate with the user's
Made up of telephone lines, radio and satellite links, all run by the local public providers.
Expensive to set up therefore many companies will purchase the use of a pre-existing WAN rather than set up their own.
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Advantages
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Users have the capability of accessing a vast and diverse range of multimedia resources and services
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Disadvantages
Additional security is needed to prevent such attacks, for example by installing a firewall
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Key Characteristics
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Transmission Errors - Greater chance of an error occurring as packets of data are being sent over longer distances
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Ownership - Parts of the structure will often be owned by other people, often quite a number.
Connection Method - Can be coaxial cables, twisted cables, fibre optic cables or radio waves. They will also make use of telephone network systems, leased lines and sometimes satellites
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