Lecture Data communications and networks: Chapter 23 - Forouzan

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Nội dung

Chapter 23 - Process-to-process delivery: UDP, TCP, and SCTP. Chapter 23 discusses three transport layer protocols in the Internet: UDP, TCP, and SCTP. The first, User Datagram Protocol (UDP), is a connectionless, unreliable protocol that is used for its efficiency. The second, Transmission Control Protocol (TCP), is a connection-oriented, reliable protocol that is a good choice for data transfer. The third, Stream Control Transport Protocol (SCTP) is a new transport-layer protocol designed for multimedia applications.

Chapter 23 Process-to-Process Delivery: UDP, TCP, and SCTP 23.1 Copyright © The McGrawHill Companies, Inc. Permission required for reproduction or display 23-1 PROCESS-TO-PROCESS DELIVERY The transport layer is responsible for processto process delivery—the delivery of a packet, part of a message, from one process to another. Two processes communicate in a client/server relationship, as we will see later. Topics discussed in this section: Client/Server Paradigm Multiplexing and Demultiplexing Connectionless Versus ConnectionOriented Service Reliable Versus Unreliable Three Protocols 23.2 Note The transport layer is responsible for process-to-process delivery 23.3 Figure 23.1 Types of data deliveries 23.4 Figure 23.2 Port numbers 23.5 Figure 23.3 IP addresses versus port numbers 23.6 Figure 23.4 IANA ranges 23.7 Figure 23.5 Socket address 23.8 Figure 23.6 Multiplexing and demultiplexing 23.9 Figure 23.7 Error control 23.10 Note In an SCTP packet, control chunks come before data chunks 23.75 Figure 23.32 General header 23.76 Table 23.5 Chunks 23.77 Note A connection in SCTP is called an association 23.78 Note No other chunk is allowed in a packet carrying an INIT or INIT ACK chunk A COOKIE ECHO or a COOKIE ACK chunk can carry data chunks 23.79 Figure 23.33 Fourway handshaking 23.80 Note In SCTP, only DATA chunks consume TSNs; DATA chunks are the only chunks that are acknowledged 23.81 Figure 23.34 Simple data transfer 23.82 Note The acknowledgment in SCTP defines the cumulative TSN, the TSN of the last data chunk received in order 23.83 Figure 23.35 Association termination 23.84 Figure 23.36 Flow control, receiver site 23.85 Figure 23.37 Flow control, sender site 23.86 Figure 23.38 Flow control scenario 23.87 Figure 23.39 Error control, receiver site 23.88 Figure 23.40 Error control, sender site 23.89 ... Figure? ?23. 1 Types of? ?data? ?deliveries 23. 4 Figure? ?23. 2 Port numbers 23. 5 Figure? ?23. 3 IP addresses versus port numbers 23. 6 Figure? ?23. 4 IANA ranges 23. 7 Figure? ?23. 5 Socket address 23. 8 Figure? ?23. 6 Multiplexing? ?and? ?demultiplexing... Figure? ?23. 6 Multiplexing? ?and? ?demultiplexing 23. 9 Figure? ?23. 7 Error control 23. 10 Figure? ?23. 8 Position of UDP, TCP,? ?and? ?SCTP in TCP/IP suite 23. 11 2 3- 2 USER DATAGRAM PROTOCOL (UDP) The User Datagram Protocol ... Table? ?23. 2 Wellknown ports used by TCP 23. 23 Figure? ?23. 13 Stream delivery 23. 24 Figure? ?23. 14 Sending? ?and? ?receiving buffers 23. 25 Figure? ?23. 15 TCP segments 23. 26 Note The bytes of data being transferred in

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