Exam: 200-301: Cisco Certified Network Associate (CCNA) 0 Likes
When a switch receives a frame for a known destination MAC address (CCNA 200-301)
When a switch receives a frame for a known destination MAC address, how is the frame handled?
A. flooded to all ports except the one from which it originated
B. forwarded to the first available port
C. sent to the port identified for the known MAC address
D. broadcast to all ports
Solution
Correct answer: C. sent to the port identified for the known MAC address.
When a switch receives a frame for a known destination MAC address, it checks its MAC address table (also known as the CAM table) to determine which port the destination device is connected to. If the MAC address is found in the table, the switch will forward the frame to the specific port associated with that MAC address. This is known as unicast forwarding.
The other options are incorrect because:
A. Flooding to all ports except the one from which it originated is what happens when the switch does not know the destination MAC address, not when it does.
B. Sending the frame to the first available port is not a valid forwarding method, as it would not guarantee delivery to the correct destination.
D. Broadcasting to all ports is what happens when the destination MAC address is unknown or is a broadcast address (FF:FF:FF:FF:FF:FF), not when the MAC address is known.
Category: Network Fundamentals