13 - Intro to Network Layer

13 - Intro to Network Layer - Last Lecture TCP 1 2...

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Last Lecture: TCP 1. Multiplexing and Demultiplexing 2. Byte-stream service ! Stream of bytes sent and received, not stream of packets 3. Reliable data transfer ! A combination of go-back-N and selective repeat, and performance tuning heuristics 4. Connection management ! Connection establishment and tear down 5. Flow control ! Prevent sender from overflowing receiver 6. Congestion control ! ! General principles & How TCP does it SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 1
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This Lecture: Network Layer 1. Design goals and issues ! ! Debate around service model/design principle question 2. Routing and Forwarding 3. Addressing, Fragmentation and reassembly 4. Internet Routing Protocols and Inter-networking 5. Router design 6. Congestion Control, Quality of Service 7. More on the Internet’s Network Layer SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 2
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Network Layer’s Main Tasks SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 4 o Carry packets from a source (host) to a destination efficiently o Provide “carrier” services to the transport layer application transport network data link physical application transport network data link physical 1. Send data 2. Receive data
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Basic Design Questions ! What services to provide to the transport layer? ! Connection oriented vs connectionless ! Any other Quality of Service (QoS) guarantee? ! How to implement those services “efficiently” on top of various different intermediate networks? ! Routing ! Forwarding (datagram, virtual circuit, source routing) ! Addressing ! Fragmentation and reassembly !
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