Cisco Certified Network Associate (CCNA) Practice Exam

Which command would you use to enter interface configuration mode for a router?

1. (config)#interface INTERFACE

2. (config-if)#interface

3. (config)#set interface

4. (config-if)#interface set

The correct answer is: (config)#interface INTERFACE

To enter interface configuration mode for a router, the command utilized follows the syntax of specifying the interface type and its identifier. The correct command allows the user to access the settings specific to that interface, enabling configuration options like IP address assignment, encapsulation type, and other interface-specific parameters. The format `(config)#interface INTERFACE` signifies that you are in global configuration mode and intend to move into the configuration for a specific interface. By replacing "INTERFACE" with the actual name of the interface (such as FastEthernet0/1 or GigabitEthernet1), you effectively direct the system to the desired interface configuration area. This command is foundational in network device configuration since interfaces on routers and switches are where many critical settings occur, and it's essential to be in the correct mode to make those changes. The clarity of the command structure is key in Cisco IOS, allowing for streamlined configuration processes. Utilizing any other command formats presented in the options does not lead to the intended interface configuration mode. For instance, simply typing `(config-if)#interface` or similar variations does not adhere to the correct syntax and would not yield the expected result of entering interface configuration mode.