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CSE 461

CSE 461. Section #7: Getting Data from Point A to Point B. Packet-Switched Networks. Host B. Router. Router. Router. Router. Router. Host A. Router. Router. Packet-Switched Networks. What are some advantages of this? Easy to set up and add nodes Scales well

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CSE 461

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  1. CSE 461 Section #7: Getting Data from Point A to Point B

  2. Packet-Switched Networks Host B Router Router Router Router Router Host A Router Router

  3. Packet-Switched Networks • What are some advantages of this? • Easy to set up and add nodes • Scales well • Partitioned data means errors are localized • Many connections possible over the same line • What are some disadvantages? • Less direct • Router processing power needed

  4. Packet-Switched Networks Host B Router Router Router Router Router Host A Router Router

  5. Circuit-Switched Networks Host B Host Q Host P Host A

  6. Circuit-Switched Networks • What are some advantages of this? • Easy to keep networks separate and private • Consistent response time • Quality of Service • What are some disadvantages of this? • Doesn’t scale well • Takes work to set up new circuits • Unused network capacity common

  7. Early Circuit-Switched Network

  8. Circuits in packet-switched networks? • Virtual circuits • Connection-oriented communication • Like circuits, but delivered over packets • Examples? • Tor • TCP • Multiprotocol Label Switching

  9. Multiprotocol Label Switching (MPLS) • Virtual circuit protocol • Developed by Cisco • For use inside networks • Works on the link layer • Labels added to link layer frames

  10. MPLS Labels • Routers very quickly look at, remove, and add labels • Routing decisions using labels • Traffic class field determines QoS priority • Why do this instead of just using IP addresses? • Why is this scheme problematic?

  11. QoS (Quality of Service) • Traffic can be routed according to priority • Why might we want to prioritize trafficdifferently? • Traffic can also be rerouted dynamicallyaccording to network conditions • Examples? • How could QoS this be a problem?

  12. Net Neutrality

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