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Understanding Local Area Networks: Topologies, Media, and Access Control

Learn about LAN topologies like bus, ring, and star, transmission processes, wired layouts, and medium access control. Explore various media choices and their impact on network performance and reliability.

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Understanding Local Area Networks: Topologies, Media, and Access Control

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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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