For a technician to test network connectivity to a remote host on a Unix Server, which of the following commands should they run?

To test network connectivity to a remote host on a Unix Server, the most effective command to use is PING. This command sends Internet Control Message Protocol (ICMP) echo request packets to the specified IP address or hostname and waits for an echo reply. By successfully receiving a reply, the technician can confirm that the remote host is reachable over the network, which is critical for diagnosing network connectivity issues.

The other options have different purposes and are not suitable for directly testing connectivity to a remote host. IPCONFIG, for example, is a command used in Windows for displaying network configuration details and is not applicable in a Unix environment. ARP is used for viewing or modifying the Address Resolution Protocol cache, which maps IP addresses to MAC addresses, but it does not test connectivity. IFCONFIG is used for configuring network interfaces on Unix/Linux systems, providing information about the local network interfaces rather than testing connectivity to a remote host.