| 单词 | TCP (Transmission Control Protocol) |
| 释义 | TCP (Transmission Control Protocol) • Reserved: 6 bits reserved for future use. • Code Bits: 6 bits that define the purpose and contents of the segment, e.g., acknowledgment, connection reset, and end of byte stream. • Window: 16 bits that advertise the size of the sender’s sliding receive window, that is, how much data the host computer is willing to accept, based on its buffer size. • Checksum: A 16-bit cyclic redundancy check (CRC) used for error control in the data field, as well as the header. • Urgent Pointer: 16 bits that identify urgent out-of-band data (i.e., data not part of the information stream). Such data is treated on a high-priority basis, in advance of data-stream octets that might be awaiting consumption by the destination hosts. Urgent data, for example, might include a keyboard sequence to interrupt or abort a program. • Options, If Any: 24 bits that address a variety of options, such as maximum segment size ( MSS). • Padding: 8 bits in an optional field used only when necessary to ensure that the TCP header extends to an exact multiple of 32 bits.This field is used only when the Options, If Any field is used. • Data: A variable-length field that contains the actual data content, or payload.When TCP is used in conjunction with IPv4, the minimum size of the data field is 536 octets, which is the minimum size of the IPv4 datagram, less 20 octets each for the standard IP and TCP headers. See also AlohaNet, application, byte, connection-oriented, CRC, datagram, error control, flow control, header, host, IETF, Internet, IP, NCP, octet, packet, payload, port, protocol, protocol suite, segment, segmentation, stream-oriented, TCP/IP, Transport Layer, UTP, virtual circuit, well-known port, and window. |
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