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LAN Overview (5.1)

LAN Overview (5.1). CSE 3213 Fall 2011. Local Area Networks (LANs). usually owned by the organization that is using the network to interconnect equipment key elements: topology transmission medium wiring layout medium access control. LAN Topologies. Bus and Tree.

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LAN Overview (5.1)

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  1. LAN Overview (5.1) CSE 3213 Fall 2011

  2. Local Area Networks (LANs) • usually owned by the organization that is using the network to interconnect equipment • key elements: • topology • transmission medium • wiring layout • medium access control

  3. LAN Topologies

  4. Bus and Tree

  5. Frame Transmissionon Bus LAN

  6. Ring Topology • a closed loop of repeaters joined by point-to-point links • receive data on one link & retransmit on another • links unidirectional • stations attach to repeaters • data transmitted in frames • circulate past all stations • destination recognizes address and copies frame • frame circulates back to source where it is removed • medium access control determines when a station can insert frame

  7. Frame TransmissionRing LAN

  8. Star Topology • each station connects to common central node • usually via two point-to-point link • one for transmission and one for reception

  9. Choice of Topology • medium • wiring layout • access control

  10. Bus LAN Transmission Media cont…

  11. Bus LAN Transmission Media (2) • only baseband coaxial cable has achieved widespread use

  12. Ring and Star Topologies

  13. Choice of Medium • constrained by LAN topology • capacity • to support the expected network traffic • reliability • to meet requirements for availability • types of data supported • tailored to the application • environmental scope • provide service over the range of environments

  14. Media Available

  15. Reading • Section 15.1, Stallings’ book • Next time: Chapter 16 Ethernet

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