Rosa can remote into a Linux server using a management IP address separate from the one users resolve via DNS. Which command should she run to start troubleshooting the server's network interface?

• A. nslookup
• B. traceroute
• C. ifconfig
• D. curl

Answer: (C)

When you need to troubleshoot a Linux server’s network setup, you start by examining how the interfaces are configured on the host itself. The ifconfig command shows the active network interfaces, their addresses, and whether each interface is up or down, along with MAC addresses and basic stats. This helps you verify that the management IP address is actually assigned to the correct interface and that that interface is up and usable for remote access. The other commands test areas outside the local interface: nslookup checks DNS name resolution, traceroute reveals the path packets take to a destination, and curl tests an HTTP service. Ifconfig is the quickest way to confirm the server’s own network interface state and configuration, which is the logical first step in diagnosing connectivity issues to a management IP.