Transmission Control Protocol (TCP) ( ) , TCP/IP.
OSI.
TCP , , , , (. T/TCP). UDP , , , .
TCP, , , TCP .
, TCP , , - -. TCP . TCP. TCP , , .
TCP , . TCP 3 :
TCP .
1. , , SYN.
2. SYN, ACK.
3. SYN-RECEIVED ACK, ESTABLISHED.
, , . , , . , , . , , , . , , .
, , , TCP . . , . , . , , .
:
FIN ACK .
ACK, FIN, .
ACK, .