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Ch4 - EEE459/591 Cm om unication Ne tworks S pring 2007...

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Network Layer 4-1 EEE459/591 Communication Networks Spring 2007 Prof. M. Reisslein Chapter 4 Network Layer Textbook: Computer Networking: A Top Down Approach Featuring the Internet, 3 rd edition. Jim Kurose, Keith Ross Addison-Wesley.
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Network Layer 4-2 Chapter 4: Network Layer Chapter goals: understand principles behind network layer services: routing (path selection) dealing with scale how a router works advanced topics: IPv6, mobility instantiation and implementation in the Internet
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Network Layer 4-3 Chapter 4: Network Layer 4. 1 Introduction 4.2 Virtual circuit and datagram networks 4.3 What’s inside a router 4.4 IP: Internet Protocol Datagram format IPv4 addressing ICMP IPv6 4.5 Routing algorithms Link state Distance Vector Hierarchical routing 4.6 Routing in theInternet RIP OSPF BGP 4.7 Broadcast and multicast routing
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Network Layer 4-4 Network layer transport 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
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Network Layer 4-5 Key Network-Layer Functions forwarding: movepackets fromrouter’s input to appropriaterouter output routing: determineroute taken by packets fromsource to dest. Routing algorithms analogy: routing: process of planning trip fromsourceto dest forwarding: process of getting through single interchange
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Network Layer 4-6 1 2 3 0111 value in arriving packet’s header routing algorithm local forwarding table header value output link 0100 0101 0111 1001 3 2 2 1 Interplay between routing and forwarding
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Network Layer 4-7 Connection setup 3 rd important function in somenetwork architectures: ATM, frame relay, X.25 Beforedatagrams flow, two hosts and intervening routers establish virtual connection Routers get involved Network and transport layer cnctn service: Network: between two hosts Transport: between two processes
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Network Layer 4-8 Network service model Q: What servicemodel for “channel” transporting datagrams from sender to rcvr? Exampleservices for individual datagrams: guaranteed delivery Guaranteed delivery with less than 40 msec delay Example services for a flow of datagrams: In-order datagram delivery Guaranteed minimum bandwidth to flow Restrictions on changes in inter-packet spacing
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Network Layer 4-9 Network layer service models: Network Architecture Internet ATM ATM ATM ATM Service Model best effort CBR VBR ABR UBR Bandwidth none constant rate guaranteed rate guaranteed minimum none Loss no
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