Transport Layer - Toshiba E-STUDIO190F Service Manual

9.4.

Transport Layer

9.4.1. TCP (Transmission Control Protocol)
The TCP (Transmission Control Protocol) is an internetwork connection-oriented protocol that corresponds
to the OSI Transport layer. TCP provides full-duplex, end-to-end connections. When the end-to-end
communication acknowledgement is not required, the UDP (User Datagram Protocol) can be substituted for
the TCP at the Transport (host-to-host) level. TCP and UDP operate at the same layer.
The UDP is a connectionless oriented protocol.
IP Datagram
TCP segment
IP Header TCP Header Application Data
(20 byte) (20 byte) (vary)
TCP Segment in IP Datagram
Source Port (2 byte) Destination Port (2 byte)
Sequence Number (4 byte)
Acknowledgment Number (4 byte)
Reserved
Header Length
Control Flag
Window (6 byte)
(6 bit)
(4 bit) (6 bit)
Checksum (2 byte) Urgent Pointer (2 byte)
Option PAD
Data (Segment)
TCP Segment Outline
TCP Header Monitoring Sample
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