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Network Topologies & Standards

Network Topologies & Standards. Vivian Arzola. Overview. Preliminary Terms Hardware Basics Topologies Channel Access Methods Standards. Preliminary Terms. Node – interconnected devices in a computer network

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Network Topologies & Standards

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  1. Network Topologies & Standards Vivian Arzola

  2. Overview • Preliminary Terms • Hardware Basics • Topologies • Channel Access Methods • Standards

  3. Preliminary Terms • Node – interconnected devices in a computer network • e.g. terminals, computers, printers, scanners, servers, repeaters, routers, etc. • Link – Physical medium connecting two nodes • cable • wireless • Packet – small block of data transmitted at one time • header • data • trailer

  4. Hardware Basics • Wireless Transmission Media: • Radio • Infrared • Microwave • Lightwave (laser)

  5. Hardware Basics… • Copper cables • Coaxial (thick/thin) • Twisted Pair (STP/UTP)

  6. Hardware Basics… • Coaxial cable

  7. Hardware Basics… • Twisted Pair

  8. Hardware Basics… • Fiber Optic Cable • Single Mode • Multimode

  9. Hardware Basics… • Multimode Fiber Optic Cable

  10. Topologies • Point-to-Point • Multipoint (Broadcast) • dedicated physical connections • impractical for LAN’s • used for long-distance networks

  11. Topologies… • Tree Topology (point-to-point)

  12. Topologies… • Tree Topology (point-to-point)

  13. Topologies… • Point-to-Point • Multipoint (Broadcast) • dedicated physical connections • impractical for LAN’s • used for long-distance networks • shared communication channel • requires coordinating use (delays) • reduces cost

  14. Topologies… • Bus Topology

  15. Topologies… • Ring Topology

  16. Topologies… • Star Topology

  17. Channel Access Methods… (preventing collisions!) • Carrier Sense Multiple Access (CSMA) • checks for electrical activity before transmission • Carrier Sense Multiple Access with Collision Detection (CSMA/CD) • supports collision recovery • binary exponential backoff

  18. Channel Access Methods… (preventing collisions!) • Polling • delays • single point of failure • no monopolization • Token-Passing • zero collisions • equal access • great performance on high traffic networks

  19. Channel Access Methods… (preventing collisions!) • Demand Priority • can assign priorities • costly • single point of failure

  20. Standards

  21. Standards…

  22. Standards…

  23. Standards…

  24. Questions?

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