ICND1: Interconnecting Cisco Networking Devices Part 1 (CCENT, legacy) — Question 67

How are MAC addresses removed from a MAC address table?

Answer options

• A. They are removed automatically if they remain inactive for the duration of the switch aging timer.
• B. They are removed automatically on a FIFO basis when the address-table limit has been reached.
• C. They must be manually cleared from the table.
• D. They are removed automatically if they remain inactive for the duration of the global MAC address timer.

Correct answer: D

Explanation

The correct answer is D because MAC addresses are removed from the table after being inactive for a certain amount of time defined by the global MAC address timer. Option A is incorrect because it refers specifically to the switch aging timer, which is not the global timer mentioned in the question. Option B is wrong because it describes a FIFO removal process rather than inactivity-based removal, and Option C is incorrect as it suggests manual intervention is needed, which is not true for inactive addresses.