L6LANtech6 - Part 2 Packet Transmission Part 2 Packet...

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1 Part 2 – Packet Transmission LAN Technologies and Network Topology Gail Hopkins Part 2 – Packet Transmission Introduction ± LANs and shared media ± Locality of reference ± Star, bus and ring topologies ± Medium access control protocols Part 2 – Packet Transmission Early Mesh Networks ± Early local networks used dedicated links between each pair of computers ± Some useful properties Ð hardware and frame details can be tailored for each link Ð easy to enforce security and privacy Part 2 – Packet Transmission Disadvantages of Meshes ± Poor scalability Links = N 2 –N 2 (a) (b) (c) Part 2 – Packet Transmission Links Between Rooms/Buildings ± Many links would follow the same physical path ± Wired mesh networks therefore obsolete ± BUT Wireless mesh networks in use today (see later) location 1 location 2 Part 2 – Packet Transmission 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
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2 Part 2 – Packet Transmission 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 Ð physical locality of reference - computers more likely to communicate with those nearby Ð temporal locality of reference - computer is more likely to communicate with the same computers repeatedly Part 2 – Packet Transmission LAN Topologies ± LANs may be categorised according to topology computers connected to network
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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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L6LANtech6 - Part 2 Packet Transmission Part 2 Packet...

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