CCNA: Cisco Certified Network Associate — Question 1222

What are two benefits of using the PortFast feature? (Choose two.)

Answer options

• A. Enabled interfaces are automatically placed in listening state.
• B. Enabled interfaces wait 50 seconds before they move to the forwarding state.
• C. Enabled interfaces never generate topology change notifications.
• D. Enabled interfaces come up and move to the forwarding state immediately.
• E. Enabled interfaces that move to the learning state generate switch topology change notifications.

Correct answer: C, D

Explanation

The correct answers are C and D because the PortFast feature allows interfaces to bypass the typical state transitions and go directly to the forwarding state, avoiding delays and preventing topology change notifications from being sent. Options A, B, and E incorrectly describe the behavior of interfaces with PortFast enabled, as they do not enter listening state, do not wait 50 seconds, and do not generate topology change notifications when transitioning to the forwarding state.