cnp3-ebook/protocols/tcp — English @ Weblate

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75 ../../protocols/tcp.rst:243

	English TCP reliable data transfer 26/10000 · 26
76 ../../protocols/tcp.rst:245

	English The original TCP data transfer mechanisms were defined in :rfc:`793`. Based on the experience of using TCP on the growing global Internet, this part of the TCP specification has been updated and improved several times, always while preserving the backward compatibility with older TCP implementations. In this section, we review the main data transfer mechanisms used by TCP. 375/10000 · 375
77 ../../protocols/tcp.rst:247

	English TCP is a window-based transport protocol that provides a bi-directional byte stream service. This has several implications on the fields of the TCP header and the mechanisms used by TCP. The three fields of the TCP header are : 227/10000 · 227
78 ../../protocols/tcp.rst:249

	English `sequence number`. TCP uses a 32 bits sequence number. The `sequence number` placed in the header of a TCP segment containing data is the sequence number of the first byte of the payload of the TCP segment. 206/10000 · 206
79 ../../protocols/tcp.rst:250

	English `acknowledgment number`. TCP uses cumulative positive acknowledgments. Each TCP segment contains the `sequence number` of the next byte that the sender of the acknowledgment expects to receive from the remote host. In theory, the `acknowledgment number` is only valid if the `ACK` flag of the TCP header is set. In practice, almost all [#fackflag]_ TCP segments have their `ACK` flag set. 388/10000 · 388
80 ../../protocols/tcp.rst:251

	English `window`. a TCP receiver uses this 16 bits field to indicate the current size of its receive window expressed in bytes. 119/10000 · 119
81 ../../protocols/tcp.rst:255

	English The Transmission Control Block 30/10000 · 30
82 ../../protocols/tcp.rst:257

	English For each established TCP connection, a TCP implementation must maintain a Transmission Control Block (:term:`TCB`). A TCB contains all the information required to send and receive segments on this connection :rfc:`793`. This includes [#ftcpurgent]_ : 250/10000 · 250
83 ../../protocols/tcp.rst:259

	English the local IP address 20/10000 · 20
84 ../../protocols/tcp.rst:260

	English the remote IP address 21/10000 · 21
85 ../../protocols/tcp.rst:261

	English the local TCP port number 25/10000 · 25
86 ../../protocols/tcp.rst:262

	English the remote TCP port number 26/10000 · 26
87 ../../protocols/tcp.rst:263

	English the current state of the TCP FSM 32/10000 · 32
88 ../../protocols/tcp.rst:264

	English the `maximum segment size` (MSS) 32/10000 · 32
89 ../../protocols/tcp.rst:265

	English `snd.nxt` : the sequence number of the next byte in the byte stream (the first byte of a new data segment that you send uses this sequence number) 146/10000 · 146
90 ../../protocols/tcp.rst:266

	English `snd.una` : the earliest sequence number that has been sent but has not yet been acknowledged 93/10000 · 93
91 ../../protocols/tcp.rst:267

	English `snd.wnd` : the current size of the sending window (in bytes) 61/10000 · 61
92 ../../protocols/tcp.rst:268

	English `rcv.nxt` : the sequence number of the next byte that is expected to be received from the remote host 101/10000 · 101
93 ../../protocols/tcp.rst:269

	English `rcv.wnd` : the current size of the receive window advertised by the remote host 80/10000 · 80
94 ../../protocols/tcp.rst:270

	English `sending buffer` : a buffer used to store all unacknowledged data 65/10000 · 65

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