What command line is used to verify IP connectivity to a device?

The command line used to verify IP connectivity to a device is "ping." This command sends Internet Control Message Protocol (ICMP) echo request packets to the target device and listens for a response. The primary purpose of the ping command is to determine whether a device is reachable across an IP network. If the target device is online and correctly configured to respond, it will send back an echo reply, allowing the user to see not only if the device is reachable but also the round-trip time for the packets, which can be useful for diagnosing network issues.

In contrast, the other commands serve different purposes: "traceroute" identifies the path that packets take to reach a specific destination, which helps in understanding the route and possible points of failure in network connectivity but does not directly verify reachability. "ipconfig" displays network configuration information for a device, such as IP address and subnet mask, but does not test connectivity to other devices. "nslookup" is used to query DNS servers to obtain domain name resolution information, which assists in understanding domain-related issues rather than connectivity verification.