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 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 the Internet 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 application transport
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Network Layer 4-5 Key Network-Layer Functions forwarding: move packets from router’s input to appropriate router output routing: determine route taken by packets from source to dest. Routing algorithms analogy: process of planning trip from source to dest 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 some network architectures: ATM, frame relay, X.25 Before datagrams 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 service model for “channel” transporting datagrams from sender to rcvr? Example services for individual datagrams: guaranteed delivery Guaranteed delivery with less than 40 msec delay Example services for a flow of 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 yes yes no no Order no yes yes yes yes Timing no yes yes no no Congestion feedback no (inferred via loss) no congestion no congestion yes no Guarantees ?
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Network Layer 4-10 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
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This note was uploaded on 11/01/2009 for the course EEE 459 taught by Professor Martinreisslein during the Spring '09 term at ASU.

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

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