Cisco Certified Network Associate (CCNA) Practice Exam

Which type of connection utilizes the command 'no shutdown'?

1. Ethernet connection

2. Serial connection

3. Wireless connection

4. Fiber connection

The correct answer is: Serial connection

The command 'no shutdown' is commonly used in networking to enable an interface on a router or switch. When this command is applied to a serial connection, it serves to activate that specific interface, allowing for data transmission. By default, many interfaces on Cisco devices are administratively shut down, meaning they will not transmit or receive data until explicitly enabled using the 'no shutdown' command. In the context of Ethernet, wireless, and fiber connections, the command is still applicable, but its most notable use and frequent association in practice is with serial connections, especially in the context of point-to-point communications found in many routing scenarios. Understanding how and when to use 'no shutdown' is crucial for configuring interfaces properly across various types of connections.