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Chapter 9 Internetworking

Chapter 9 Internetworking. Internetworking Technology System Network Architecture/Local Area Network Integration. Internetworking Technology. Bridging Routing Switching Repeating. Bridging. Equipment: bridges Operation 80/20 rule Destination and source address Known local nodes table

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Chapter 9 Internetworking

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  1. Chapter 9Internetworking • Internetworking Technology • System Network Architecture/Local Area Network Integration

  2. Internetworking Technology • Bridging • Routing • Switching • Repeating

  3. Bridging • Equipment: bridges • Operation • 80/20 rule • Destination and source address • Known local nodes table • Forward-if-not-local • Broadcasting

  4. Bridging - Pros & Cons • Pros • Easy to install & configure • Quick & cost-effective • Between different network architectures • Different media types • providing repeating, retiming & regenerating • Cons • Propagation (all LANs) • Broadcast storm (improperly addressed frame)

  5. Routing • Equipment: routers • Operation • Router is destination address of data link layer • Read network layer destination address • Use routing table to select the best path • Create new destination address (destination router) of data link layer • Forward-if-proven-remote

  6. Routing - Pros & Cons • Pros • More efficient use of bandwidth • Load balance (best path: hops, cost & congestion) • Dynamic routing table • Firewall (misaddressed or misbehaving frames) • Scaleable • Management information via SNMP • Multiple protocols • Cons • Complexity • Costs

  7. Switching • Equipment: switches • Pros • Increase bandwidth • Virtual LANs • Cons • No filtering or security • Single path • Management problem (microsecond)

  8. Repeaters • Regenerating & retiming incoming digital signal • Pass all signals • Connect different media • Extend LAN distance

  9. LAN-To-Mainframe • Hierarchical networks: Classic SNA (system network architecture) • Micro-Mainframe

  10. Classic SNA Architecture • Front-end Processor (FED) • Cluster controller

  11. FEPs - Functions • Security • Error checking • Code converting • Line management • Message queue • Managing computer resources • Usage accounting

  12. Cluster Controller • Similar to FEP • Low cost

  13. Micro-Mainframe • LAN-based SNA gateway • LAN server with protocol conversion software & hardware • Cost effective • Mainframe channel-attached gateway • Replace FEP • Cheaper

  14. SNA Model • Transaction service • Presentation service • Data flow control • Transmission control • Path control • Data link control Physical control

  15. Assignment • Review chapters 8 - 9 • Read chapter 13

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