Lecture11 - Tue sday, May 6 Hom work #3 is poste e d Lab #4...

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1 Tuesday, May 6 Homework #3 is posted Lab #4 is posted Sign up Program #1 Due Friday, May 9 Evaluation criteria are posted Notes on implementation Let the socket API and TCP/IP protocols do their jobs!
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2 Today’s topics Introduction to the Network Layer Virtual Circuits Datagrams Forwarding Routing Quiz #2
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3 Transport layer / Network layer transport layer: logical communication between processes relies on, enhances, network layer services network layer: communication between hosts application physical transport network data link logical end-end transport
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4 Network layer network layer protocols run at end systems routers Sender side: get segments from transport layer encapsulates segments into datagrams routers examine header fields in all IP datagrams Receiver side: delivers segments to transport layer application transport network data link physical
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5 Two 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: process of planning trip from source to destination process of getting through single interchange
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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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Lecture11 - Tue sday, May 6 Hom work #3 is poste e d Lab #4...

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