What does the command netstat -a display?

The command "netstat -a" is used to display all active connections on a system, including both listening and established connections. This command provides a comprehensive view of all the network connections that are currently active, showing both TCP and UDP connections. It lists the local and remote addresses, along with their respective ports, and indicates the state of the TCP connections (such as ESTABLISHED, LISTENING, TIME_WAIT, etc.).

This information is crucial for troubleshooting network issues, monitoring network traffic, or understanding which services are currently running and accessible on a given machine. The ability to see all active connections can help in diagnosing connectivity problems or security issues, such as unauthorized access or network scanning activities.

The other options, while related to network information, do not accurately describe the comprehensive nature of the output provided by "netstat -a." For instance, connection statistics only focus on analytical data rather than active connections. Monitoring only listening ports would exclude established connections, and network latency information pertains to response time data rather than active connection status. Thus, the option chosen correctly encompasses the full range of connections displayed by the command.