Chapter4 - Chapter 4 Network Layer This se of slide is e...

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Network Layer 4-1 Chapter 4 Network Layer This set of slides is extended from the textbook PowerPoint slides by Jim Kurose & Keith Ross.
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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
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Network Layer 4-3 Chapter 4: Network Layer 4. 1 Introduction 4.2 Virtual circuit and datagram networks 4.4 IP: Internet Protocol Datagram format IPv4 addressing ICMP 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 4.3 What’s inside a router
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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 receiving 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 destination Routing algorithms analogy: routing: process of planning trip from source to destination 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 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 4-8 Chapter 4: Network Layer 4. 1 Introduction 4.2 Virtual circuit and datagram networks 4.4 IP: Internet Protocol Datagram format IPv4 addressing ICMP 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 4.3 What’s inside a router
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Network Layer 4-9 Network layer connection and connection-less service Datagram network provides network-layer connectionless service VC network provides network-layer connection service Analogous to the transport-layer services, but: Service: host-to-host No choice: network provides one or the other Implementation: in the core
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Network Layer 4-10 Virtual circuits Call/conmnection 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
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Chapter4 - Chapter 4 Network Layer This se of slide is e...

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