TestOut Linux Pro Practice Test 2025 - Free Linux Pro Practice Questions and Study Guide

To start a network interface that has been stopped, the appropriate command is "ifup." This command is specifically designed to activate a network interface that is currently down. When you execute "ifup" followed by the name of the interface, the system will configure the network settings for that interface according to its configuration files, allowing it to communicate over the network.

For instance, if you have a network interface named eth0 that has been disabled, running the command "ifup eth0" would enable that interface, assuming that it is configured correctly in your network settings. This command ensures that the necessary network parameters, such as IP address, subnet mask, and gateway, are applied to the interface to make it operational.

In contrast, other commands mentioned do not serve the same function:

- The command "ifdown" is used to deactivate or bring down a network interface, which is the opposite of what is required in this case.

- Commands like "ip start" and "ip enable" do not exist in standard Linux networking command syntax, which makes them invalid options. Instead, the "ip" command suite is used for more advanced network configuration tasks, but it does not have a direct action like "start" or "enable" for