The "netstat -a" command is a command-line tool that can be used to display the status of all the network connections and listening ports on a server. The "netstat -a" command can show the protocol, local address, foreign address, and state of each connection or port. The network administrator can use this command to ensure the database engine is listening on a certain port by looking for the port number in the local address column and the "LISTENING" state in the state column. The other options are not commands that can be used to accomplish this goal, as they either do not display the listening ports, do not work on a server, or do not relate to the network. References: CISSP - Certified Information Systems Security Professional, Domain 4.
Communication and Network Security, 4.2 Secure network components, 4.2.2 Prevent or mitigate network attacks, 4.2.2.1 Network discovery and mapping; CISSP Exam Outline, Domain 4. Communication and Network Security, 4.2 Secure network components, 4.2.2 Prevent or mitigate network attacks, 4.2.2.1 Network discovery and mapping