lec-11 - What's Next Transport Layer Transport Layer...

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28 Aug 2008  BITS C481 (Computer Networks) 1 What’s Next… Transport Layer Transport Layer Services Multiplexing/Demultiplexing Connectionless and Connection Oriented TCP and UDP Reliable data transfer Flow control Congestion control
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28 Aug 2008  BITS C481 (Computer Networks) 2 Transport services and protocols Provide logical communication between app processes running on different hosts Transport protocols run in end systems Send side: breaks app messages into segments , passes to network layer Rcv side: reassembles segments into messages, passes to app layer Protocols Internet: TCP and UDP application transport network data link physical application transport network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical logical end-end transport
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28 Aug 2008  BITS C481 (Computer Networks) 3 Transport vs. network layer Network layer: logical communication between hosts Transport layer: logical communication between processes Relies on, enhances, network layer services Household analogy: 12 kids sending letters to 12 kids Processes = kids App messages = letters in envelopes Hosts = houses Transport protocol = Ann and Bill Network-layer protocol = postal service
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