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Chapter 4: network layer

1 network layer 4-1 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) broadcast, multicast instantiation, implementation in the Internet network layer 4-2 introduction virtual circuit and datagram networks what s inside a router IP: Internet Protocol datagram format IPv4 addressing ICMP IPv6 routing algorithms link state distance vector hierarchical routing routing in the Internet RIP OSPF BGP broadcast and multicast routing Chapter 4: outline 2 network layer 4-3 network layer transport segment from sending to receiving host on sending side encapsulates segments into datagrams on receiving side, delivers segments to transport

6 Network Layer 4-11 Virtual circuits call setup, teardown for each call before data can flow each packet carries VC identifier (not destination host address) every router on source-dest path maintains “state” for each passing connection link, router resources (bandwidth, buffers) may be allocated to VC (dedicated resources = predictable

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my.eng.utah.edu

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CS 5480/6480: Computer Networks – Spring 2012 …

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