As shown in the figure, packet obtaining software is used to obtain some packets on...

The packet capture in the figure shows three TCP packets exchanged between 192.168.1.2 and 192.168.1.1 . The first packet from 192.168.1.2 → 192.168.1.1 contains the [SYN] flag. In TCP communication, the SYN flag indicates that a host is requesting to establish a TCP connection . This is the first step of the TCP three-way handshake process.

The second packet from 192.168.1.1 → 192.168.1.2 contains [SYN, ACK] , meaning the destination host acknowledges the request and agrees to establish the connection while sending its own synchronization request. The third packet from 192.168.1.2 → 192.168.1.1 contains [ACK] , confirming the response and completing the connection establishment process.

This sequence ( SYN → SYN/ACK → ACK ) clearly indicates the TCP connection establishment procedure , not termination. TCP connection termination normally involves FIN and ACK flags rather than SYN.

Although the capture shows ports such as nfs > http , the packets shown only represent the TCP handshake and do not confirm application-layer login activities such as Telnet or HTTP authentication. Therefore, the correct statement is that the terminal is sending a TCP connection establishment request to 192.168.1.1 .