Which command would you use to test network connectivity?

The command used to test network connectivity is "ping." This utility is designed to check if a specific IP address or hostname is reachable across an IP network. When you use the ping command, it sends Internet Control Message Protocol (ICMP) Echo Request messages to the designated destination and waits for a response. A successful response indicates that the destination is reachable, while a timeout or error message suggests there may be connectivity issues.

Additionally, the other commands serve different purposes. "ipconfig" is used to view and manage the IP configuration of a Windows machine, showing details like the local IP address, subnet mask, and gateway. "tracert" (or traceroute in Unix-based systems) is utilized for tracing the path that packets take from the source to the destination, helping to identify where connection delays or failures occur, but it does not test for connectivity directly. "nslookup" is a network utility used to query Domain Name System (DNS) servers to obtain domain name or IP address mapping, assisting in validating DNS settings rather than testing connectivity.

Thus, the focus of the "ping" command on establishing basic connectivity makes it the appropriate choice for this purpose.