Which command is used to display or set the IP address, netmask, and router values for a network interface?

The command used to display or set the IP address, netmask, and router values for a network interface is indeed the 'ip' command. This command is part of the iproute2 package, which provides a modern suite of tools for managing networking in Linux. It has largely replaced the older 'ifconfig' command, which was commonly used in earlier systems.

The 'ip' command can accomplish a variety of tasks, including displaying current network interface settings, configuring new network interfaces, and managing routing tables. For instance, you might use the 'ip addr' sub-command to display the current IP address and netmask of a network interface, or 'ip addr add' to assign a new IP address.

While it's true that 'ifconfig' can also be used to set and display an interface's IP address and netmask, it is considered deprecated in many modern Linux distributions and does not support many advanced features available in the 'ip' command.

The other commands listed do not serve the same purpose as the 'ip' command. 'route' is primarily used for managing the routing table, and 'ping' is a diagnostic tool used to test connectivity to a network host. Thus, the 'ip' command is the most comprehensive and current