CCNA: Cisco Certified Network Associate — Question 874

Which port type supports the spanning-tree portfast command without additional configuration?

Answer options

• A. Layer 3 main interfaces
• B. Layer 3 subinterfaces
• C. trunk ports
• D. access ports

Correct answer: D

Explanation

The spanning-tree portfast command can be applied directly to access ports, enabling them to transition to the forwarding state immediately. Layer 3 main interfaces and subinterfaces, as well as trunk ports, do not support this command without additional configuration, making them unsuitable for this purpose.