CCNA: Cisco Certified Network Associate — Question 14

What is the primary effect of the spanning-tree portfast command?

Answer options

• A. It immediately enables the port in the listening state.
• B. It immediately puts the port into the forwarding state when the switch is reloaded.
• C. It enables BPDU messages.
• D. It minimizes spanning-tree convergence time.

Correct answer: D

Explanation

The spanning-tree portfast command is used to minimize the time it takes for a port to transition to the forwarding state, thus reducing spanning-tree convergence time. Options A and B are incorrect because they do not accurately describe the function of portfast, and option C is irrelevant as portfast does not enable BPDU messages.