414Lecture11preview

414Lecture11preview - Lecture 11 Network Layer Network...

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Unformatted text preview: Lecture 11 Network Layer Network Layer Overview, Virtual Circuits vs Datagrams, Forwarding and Routing ECSE 414 Fall 2010 ECSE 414, Lecture 11 2 Announcements Midterm Exam, Tuesday, Oct 12 Homework Assignment #2 Due now Solutions posted later today No assignments accepted after solutions posted Final exam Tentative schedule announced December 21, 9am (Not finalized yet) 2010 Michael Rabbat ECSE 414, Lecture 11 3 Chapter 4: Network Layer Chapter goals: understand principles behind network layer services: network layer service models forwarding versus routing how a router works routing (path selection) dealing with scale advanced topics: IPv6 instantiation, implementation in the Internet 2010 Michael Rabbat ECSE 414, Lecture 11 4 Network layer route segment from sending to receiving host on sending side encapsulates segments into datagrams on rcving side, delivers segments to transport layer network layer protocols in every host, router Router examines header fields in all IP datagrams passing through it network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical application transport network data link physical application transport network data link physical 2010 Michael Rabbat ECSE 414, Lecture 11 5 Two Key Network-Layer Functions forwarding: move packets from routers input to appropriate router output routing: determine route taken by packets from source to dest. routing algorithms analogy: routing: process of planning trip from source to dest forwarding: process of getting through single interchange 2010 Michael Rabbat ECSE 414, Lecture 11 6 1 2 3 0111 value in arriving packets header routing algorithm local forwarding table header value output link 0100 0101 0111 1001 3 2 2 1 Interplay between routing and forwarding 2010 Michael Rabbat...
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414Lecture11preview - Lecture 11 Network Layer Network...

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