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Example – Preston Girls SC There are four servers. “PGSC02” is a file server, storing and managing files. “ALPHA” is a print server, managing printers and print jobs. “PGSC03” is a network server, managing the internet. The computers in M9 are clients. The laptops and all teacher computers are clients.
A network topology is physical arrangement, of the devices in a communications network (also called a configuration). Three types of network. 1. Bus network 2. Ring network 3. Star network
A single central cable, to which all computers and other devices are connected. Advantages: (1) Cheap and easy to install. (2) Can attach and detach devices without disturbing the network. (3) If a device breaks down, network still works. This central red cable is the bus. Data, instructions and information can be transmitted in both directions
Cable forms a closed ring. Data goes through each device Disadvantages: (1) If one device fails, the network can’t communicate. (2) Harder to set up.
All devices connect to a central hub Similar advantages to a bus network. hub If the hub fails, so does the network. Usually a spare hub is kept available.
Operates like a miniature internet. Can use web browsers to view information. Only accessible inside an organisation (eg. school). Private company information can be sent without the possibility of internet hacking. Faster than internet because graphics do not have to pass through a modem.