What command must be entered to configure an interface on a Cisco router?

What command must be entered to configure an interface on a Cisco router?

• A. set interface
• B. interface [type] [number]
• C. config interface
• D. ip configure [type] [number]

Answer: (B)

To configure an interface on a Cisco router, the command "interface [type] [number]" is utilized. This command allows the network administrator to specify which interface is to be configured, such as a FastEthernet or GigabitEthernet interface, followed by the specific interface identifier. This structure is essential because it directs the command-line interface to enter the configuration mode for that particular interface, enabling further configuration commands to be applied directly to it. For example, entering "interface FastEthernet 0/1" indicates that the configuration actions that follow will affect the FastEthernet interface designated as 0/1. This command format is a fundamental aspect of navigating and configuring devices within Cisco's IOS, as it creates a specific context for the configurations that will be implemented. In contrast, the other choices do not reflect the correct syntax used by Cisco devices for interface configuration. "set interface" is not a valid command in Cisco IOS, while "config interface" and "ip configure [type] [number]" do not match the prescribed structure established by Cisco for accessing interface settings within the configuration mode. Each of these alternatives lacks the precise syntax required, which is essential for successful router management.

To configure an interface on a Cisco router, the command "interface [type] [number]" is utilized. This command allows the network administrator to specify which interface is to be configured, such as a FastEthernet or GigabitEthernet interface, followed by the specific interface identifier. This structure is essential because it directs the command-line interface to enter the configuration mode for that particular interface, enabling further configuration commands to be applied directly to it.

For example, entering "interface FastEthernet 0/1" indicates that the configuration actions that follow will affect the FastEthernet interface designated as 0/1. This command format is a fundamental aspect of navigating and configuring devices within Cisco's IOS, as it creates a specific context for the configurations that will be implemented.

In contrast, the other choices do not reflect the correct syntax used by Cisco devices for interface configuration. "set interface" is not a valid command in Cisco IOS, while "config interface" and "ip configure [type] [number]" do not match the prescribed structure established by Cisco for accessing interface settings within the configuration mode. Each of these alternatives lacks the precise syntax required, which is essential for successful router management.