文档介绍：Chapter 3 Transport Layer
Computer Networking: A Top Down Approach 4th edition. Jim Kurose, Keith Ross Addison-Wesley, July 2007.
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1
Transport Layer
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: connection-oriented transport
TCP congestion control
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Transport Layer
Chapter 3 outline
Transport-layer services
Multiplexing and demultiplexing
Connectionless transport: UDP
Principles of reliable data transfer
Connection-oriented transport: TCP
segment structure
reliable data transfer
flow control
connection management
Principles of congestion control
TCP congestion control
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Transport Layer
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
more than one transport protocol available to a