What is the primary function of the 'ping' command in networking?

The 'ping' command is primarily used to test connectivity between two IP devices. It operates by sending Internet Control Message Protocol (ICMP) echo request packets to the target host and listens for responses. If a reply is received, it indicates that the target device is reachable over the network, and it can also provide information about the round-trip time for the packets. This simple yet powerful tool is essential for troubleshooting network issues, verifying the operational state of a device, and ensuring that a connection exists between local and remote networks.

While other options refer to different networking functions, such as configuring devices remotely, monitoring traffic, or securing connections, none of these tasks fall within the primary purpose of the 'ping' command. The focus on sending and receiving echo requests and replies is what distinctly defines 'ping' as a utility for testing connectivity.