What is the correct order of commands to enter interface-configuration mode for port fa0/1 starting from User Exec prompt?

To access interface-configuration mode for port fa0/1 starting from the User Exec prompt, the correct sequence of commands is crucial for effective configuration. The first command, "enable," is necessary to transition from User Exec mode to Privileged Exec mode, where more advanced commands can be entered. This step is essential because interface configurations can only be made in the Privileged Exec context.

After entering Privileged Exec mode, the next command is "configure terminal." This command puts the device into Global Configuration mode, where you can configure a variety of device settings. It is a necessary step before entering any specific interface configuration.

Finally, the command "interface fastethernet0/1" is used to enter the specific interface configuration mode for the port you're interested in. At this point, you can modify settings specifically related to fa0/1.

Therefore, the sequence of commands "enable," followed by "configure terminal," and then "interface fastethernet0/1" is the correct order to achieve the desired mode transition for configuring an interface, effectively allowing the user to apply configurations as intended.