U of I CS 438 - Transport Layer (58 pages)

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Transport Layer



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Transport Layer

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Lecture Notes


Pages:
58
School:
University of Illinois
Course:
Cs 438 - Communication Networks
Communication Networks Documents

Unformatted text preview:

Transport Layer 1 Chapter 3 Transport Layer Our goals understand principles behind transport layer services multiplexing demultiplexing reliable data transfer flow control congestion control learn about transport layer protocols in the Internet UDP connectionless transport TCP connectionoriented transport TCP congestion control 2 Chapter 3 outline 3 1 Transport layer services 3 2 Multiplexing and demultiplexing 3 3 Connectionless transport UDP 3 4 Principles of reliable data transfer 3 5 Connection oriented transport TCP segment structure reliable data transfer flow control connection management 3 6 Principles of congestion control 3 7 TCP congestion control 3 Transport services and protocols network data link physical network data link physical ns tra network data link physical network data link physical rt po network data link physical nd e nd le ca gi lo 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 more than one transport protocol available to apps Internet TCP and UDP application transport network data link physical application transport network data link physical 4 Transport vs network layer network layer logical communication between hosts transport layer logical communication between processes relies on enhances network layer services Household analogy sending letters processes people app messages letters in envelopes hosts houses transport protocol sorting and collecting mail within house network layer protocol postal service 5 Internet transport layer protocols reliable in order delivery TCP no frills extension of best effort IP services not available network data link physical network data link physical network data link physical rt po unreliable unordered delivery UDP network data link physical network data link physical ns tra congestion control flow



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