| 单词 | Figure T-2 |
| 释义 | Figure T-2 The standard size of the TCP header is 20 octets, as illustrated in Figure T-2, although 4 additional octets may be used to accommodate options.The header fields are as follows: • Source Port: 16 bits that define the TCP port number used by the source application program.TCP ports are logical points of connection. • Destination Port: 16 bits that define the TCP port number used by the destination application program. • Sequence Number: 32 bits that identify the position of the data in the TCP segment relative to the entire originating byte stream. • Acknowledgment Number: 32 bits that identify the acknowledgment number of the octet that the source expects to receive next.The acknowledgment number explicitly acknowledges that all previous data octets associated with all previous segments were received correctly. • HLEN: 4 bits that specify the segment header length. 74570c20.qxd 9/12/07 12:44 AM Page 478 |
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