A: 连接请求 确认 传输数据 释放连接 确认 SYN,SEQ=100 SYN,ACK,SEQ=200,ACK=101 ACK,SEQ=101,ACK=201 SEQ=101 SEQ=201,ACK=301 SEQ=301,ACK=401 SEQ=401,ACK=501 SEQ=501,ACK=601 SEQ=601,ACK=613 FIN,SEQ=613,ACK=801 SEQ=801,ACK=614 SEQ=614,ACK=841 FIN,SEQ=841,ACK=614 SEQ=614,ACK=8412 B: 确认 传输数据及确认 确认 释放连接