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Networks What is a network? • two or more computers linked together. What does network allow users to do? • to share software and hardware What are Local Area Networks (LANs)? • Networks that link computers within a limited area (a department, an office, or a building). What are Wide Area Networks (WANs)? • Networks that link computers across the world. What advantages do networks have? - increase productivity - workers can share information easily without printing, copying, telephoning, or posting. TOPOLOGIES • Computers in a network can be connected in 3 basic topologies: a star topology a ring topology a bus topology Star topology Describe the star topology • a server computer is at the centre and a separate cable connects the server to the other computers in the network. What does the central server control? • The central server controls the flow of data in the network. What happens if the central server fails? • If the central server fails, the whole network Ring topology Describe the ring topology • each computer is connected to its neighbour in a circle, the data flow in one direction round the ring. What happens if one computer fails? • If a cable breaks or one of the computers fails, the whole network will fail. Bus topology Describe the bus topology • all the computers are connected to a common cable, the data flow in both directions along the cable. What happens if a computer fails? • If a computer fails, or we remove one from the network, the other computers won’t fail. Mesh topology Describe the mesh topology • every computer is connected to every other computer, is not commonly used.