CCNA: Cisco Certified Network Associate — Question 330

What is the benefit of configuring PortFast on an interface?

Answer options

• A. The frames entering the interface are marked with the higher priority and then processed faster by a switch.
• B. After the cable is connected, the interface is available faster to send and receive user data.
• C. Real-time voice and video frames entering the interface are processed faster.
• D. After the cable is connected, the interface uses the fastest speed setting available for that cable type.

Correct answer: B

Explanation

The correct answer is B because configuring PortFast allows the interface to bypass the usual STP (Spanning Tree Protocol) transition times, enabling it to become active immediately after the cable is connected. Options A, C, and D are incorrect as they misrepresent the functionality of PortFast, which specifically speeds up the interface availability for data traffic rather than prioritizing frames or adjusting speed settings.