What is the correct proto_state value for the CLOSE_WAIT state?

The CLOSE_WAIT state is an important part of the TCP connection lifecycle, indicating that the local end of the connection has received a connection termination request from the remote side (a FIN segment) but has not yet sent its own FIN to confirm the closure of the connection.

In the context of proto_state values, each state in the TCP connection lifecycle is assigned a specific numerical code. The value associated with the CLOSE_WAIT state is 06. This numerical representation helps in identifying and managing TCP states programmatically within firewall and networking software.

Understanding the role of the CLOSE_WAIT state clarifies why the proto_state value of 06 is the correct answer; it accurately represents the state in which the local application is still processing the connection and has yet to fully close it. This distinguishes it from the other states, each of which corresponds to different stages in the life of a TCP connection.