Which proto_state indicates that a TCP connection is actively being listened on?

The correct proto_state that indicates a TCP connection is actively being listened on is represented by the value 09. In the context of the Transmission Control Protocol (TCP), a listening state is one where a server application is waiting for incoming connections on a specific port. This is essential for establishing reliable communication between clients and servers.

When the proto_state is 09, it signifies that the associated application is actively prepared to accept incoming TCP requests. This state is critical for ensuring that services are available and can respond to client requests. Properly managing this state is key to maintaining secure and efficient network operations.

Understanding the various proto_states and their meanings helps in network troubleshooting and performance assessment, ensuring that services are running as expected.