Question 18

netstat -an is the appropriate command for viewing active connections and listening ports.

The command "netstat -an" displays all active connections and listening ports on a Windows machine, making it the most suitable choice for troubleshooting network issues.

A) netstat -an

This option is correct as it provides a comprehensive list of all active TCP and UDP connections, along with the state of each connection. The '-a' switch shows all connections and listening ports, while the '-n' switch displays addresses and port numbers in numerical form, which simplifies the output for analysis.

B) arp -a

This option is incorrect because the "arp -a" command is used to display the Address Resolution Protocol (ARP) cache, which maps IP addresses to MAC addresses. It does not provide information about active connections or listening ports.

C) tracert

This option is incorrect as "tracert" is used to trace the route packets take to reach a specific network destination. While it helps in diagnosing network paths, it does not provide details about active connections or listening ports.

D) ipconfig

This option is also incorrect because "ipconfig" is a command used to display the current configuration of the network interfaces on a Windows machine. It provides information such as IP addresses and subnet masks but does not list active connections or listening ports.

Conclusion

In summary, "netstat -an" is the definitive command for viewing all active connections and listening ports, making it the best choice for troubleshooting network issues. The other options, while useful for different networking tasks, do not fulfill the requirement of monitoring active connections or listening ports.