计算机网络课件英文版Chapter4_Network Layer.ppt

Network Layer 4-1 Chapter work Layer A note on the use of these ppt slides: We ’ re making these slides freely available to all (faculty, students, readers). They ’ re in PowerPoint form so you can add, modify, and delete slides (including this one) and slide content to suit your needs. They obviously represent a lot of work on our part. In return for use, we only ask the following: ? If you use these slides (., in a class) in substantially unaltered form, that you mention their source (after all, we ’ d like people to use our book!) ? If you post any slides in substantially unaltered form on a , that you note that they are adapted from (or perhaps identical to) our slides, and note our copyright of this material. Thanks and enjoy! JFK/KWR All material copyright 1996-2007 Kurose and . Ross, All Rights working: A Top Down Approach 4 th edition. Jim Kurose, Keith Ross Addison-Wesley, July 2007. Network Layer 4-2 Chapter 4: Network Layer Chapter goals: r understand principles work layer services: work layer service models m forwarding versus routing m how a router works m routing (path selection) m dealing with scale m advanced topics: IPv6, mobility r instantiation, implementation in the work Layer 4-3 Chapter 4: Network Layer r 4. 1 Introduction r Virtual circuit and works r What ’ s inside a router r IP: Protocol m Datagram format m IPv4 addressing m ICMP m IPv6 r Routing algorithms m Link state m Distance Vector m Hierarchical routing r Routing in the m RIP m OSPF m BGP r Broadcast and multicast work Layer 4-5 Two work-Layer Functions r forwarding: move packets from router ’ s input to appropriate router output r routing: determine route taken by packets from source to dest . m routing algorithms analogy: r routing: process of planning trip from source to dest r forwarding: process of getting through single work Layer 4-6 1 23 0111 value in arriving packet ’ s header routing algorithm local