Cisco Certified Network Professional Practice Test

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for your Cisco Certified Network Professional Test with confidence. Study using flashcards and multiple choice questions, each with detailed hints and explanations. Ensure your success on the exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is the command to configure a Layer 3 interface?

switchport
no switchport
interface port-channel
channel-group number

The correct answer is: no switchport

To configure a Layer 3 interface on a Cisco device, the command used is "no switchport." This command disables Layer 2 switching on the interface, converting it into a Layer 3 interface, which is capable of routing IP packets. When a switch port is set to Layer 2 by default, it operates within the data link layer, allowing for the transmission of frames between devices on the same VLAN. By entering "no switchport," the interface is transformed into a router interface, enabling it to participate in routing protocols and handle IP addressing, which are critical functions for network layer operations. This command is essential in scenarios where IP routing needs to be performed on interfaces traditionally used for switching, allowing for greater flexibility in network design and implementation. For instance, in a network that requires routing between VLANs, configuring specific interfaces as Layer 3 is necessary to facilitate inter-VLAN routing. The other commands provided do not serve the purpose of configuring a Layer 3 interface. The "switchport" command is used to configure an interface as a Layer 2 switch port, while "interface port-channel" pertains to the configuration of bundled interfaces, and "channel-group number" is related to the Link Aggregation Control Protocol (LACP)