Introducing Cisco Data Center Networking (DCICN) — Question 35

If a Nexus switch receives a frame and does not have an entry in its MAC table for the source, which action will take place?

Answer options

• A. The frame will be dropped.
• B. The frame will be flooded.
• C. The sender will be notified.
• D. The source address will be learned.

Correct answer: D

Explanation

The correct answer is D because when a switch receives a frame from a source not in its MAC table, it learns the source address and adds it to the table for future reference. Option A is incorrect because the frame is not dropped; it is processed. Option B is incorrect because flooding occurs if the destination is unknown, not the source. Option C is not correct, as the switch does not notify the sender of this event.