Implementing Cisco IP Switched Networks (CCNP SWITCH, legacy) — Question 118

Which switchport feature will block the packet with unknown MAC address from sending it via port?

Answer options

• A. Switchport block unicast
• B. Packet with unknown MAC will be dropped
• C. Switchport portfast
• D. Switchport protect

Correct answer: A

Explanation

The correct answer is A, as the 'Switchport block unicast' feature is specifically designed to stop packets with unknown MAC addresses from being sent out through the port. Option B is misleading because while packets with unknown MACs are indeed dropped, it does not specify the switchport feature responsible for this action. Options C and D pertain to different functionalities that do not address the issue of blocking unknown MAC addresses.