Huawei Certified ICT Associate – Data Center Network (HCIA-DCN) — Question 131

Which of the following statements are true about the dynamic MAC address table? (Choose all that apply.)

Answer options

• A. After a device is reset, an interface card is hot swapped, or an interface card is reset, the saved entries on the device or interface card are not lost.
• B. After a device is reset, an interface card is hot swapped, or an interface card is reset, dynamic MAC address entries on the device or interface card are lost.
• C. You can obtain the number of users communicating on an interface by checking the number of specified dynamic MAC address entries.
• D. Dynamic MAC address entries are obtained by learning the source MAC addresses of packets received by an interface, and can be aged out.

Correct answer: B, D

Explanation

The correct answer is B and D because dynamic MAC address entries do get lost when a device is reset or an interface card is reset, which aligns with option B. Meanwhile, option D is accurate because dynamic MAC addresses are learned from incoming packets and can expire after a certain period. Options A and C are incorrect as they misrepresent the behavior of the dynamic MAC address table regarding resets and the method of user count determination.