Which Cisco IOS command is used to assign a description to an interface?
Correct Answer: A
Detailed Explanation: Assigning a description to an interface is a best practice in network management, as it helps administrators quickly understand the purpose, connection, or location of that interface. In Cisco IOS, the command used to assign a description is simply “description”—entered under the interface configuration mode. How It Works: When you access a specific interface in configuration mode (for example, using the command interface GigabitEthernet0/1), you can then type the “description” command followed by the text you wish to assign. For example: description Connection to Server Farm This command does not affect the functionality of the interface but serves as a useful annotation. The description is displayed when you view the interface configuration using commands such as show running-config or show interfaces description, making it easier to identify the interface’s purpose during troubleshooting or documentation reviews. Benefits of Using Interface Descriptions: Simplified Troubleshooting: When diagnosing network issues, clear interface descriptions help network administrators quickly locate relevant interfaces, reducing downtime and speeding up resolution times. Enhanced Documentation: Well-documented interfaces assist not only current administrators but also future team members who need to understand the network layout. This is particularly important in large-scale networks with many interconnected devices. Improved Network Management: During routine audits or configuration changes, having descriptive labels allows for easier verification of network designs and policies, ensuring that all connections are properly accounted for. Distinguishing the Command: The options provided (interface description, set description, ip description) are not valid Cisco IOS commands. The command structure in Cisco IOS is designed to be simple and intuitive. Once you are in the interface configuration mode, the only command needed to add a description is “description” followed by the desired text. Practical Use Cases: For example, in a campus network, an administrator might label interfaces connected to a specific building or department. In a data center, the description might indicate the type of equipment (e.g., “Uplink to Core Switch” or “Connection to Backup Storage”) to facilitate rapid identification during maintenance or emergency scenarios. For CCNA exam preparation, knowing how to configure interface descriptions is a fundamental skill. It is one of the many small yet important configuration tasks that contribute to effective network management and troubleshooting. In summary, to assign a description to an interface in Cisco IOS, you use the “description” command. This simple command improves documentation, simplifies troubleshooting, and aids in overall network management.
This CCNA practice question helps students prepare for Cisco networking certification exams by testing knowledge of network fundamentals, routing, switching, and network security concepts.