6 - LAN technologies and network topology LANs and shared...

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Unformatted text preview: LAN technologies and network topology LANs and shared media Locality of reference Star, bus and ring topologies Medium access control protocols Mesh networks Early local networks used dedicated links between each pair of computers Some useful properties hardware and frame details can be tailored for each link easy to enforce security and privacy Disadvantages of meshes Poor scalability Links between rooms/buildings Many links would follow the same physical path Shared Communication Channels Shared LANs invented in the 1960s Rely on computers sharing a single medium Computers coordinate their access Low cost But not suitable for wide area - communication delays inhibit coordination Locality of reference LANs now connect more computers than any other form of network The reason LANs are so popular is due to the principle of locality of reference physical locality of reference - computers more likely to communicate with those nearby temporal locality of reference - computer is more likely to communicate with the same computers repeatedly LAN topologies LANs may be categorised according to topology star ring bus Pros and cons...
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This note was uploaded on 08/14/2011 for the course ELECTRONIC G52CCN taught by Professor Professorgail during the Spring '09 term at Uni. Nottingham.

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6 - LAN technologies and network topology LANs and shared...

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