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Cisco CCNA 200-301: Switching feature removes unused MAC address


Which switching feature removes unused MAC addresses from the MAC address table, which allows new MAC addresses to be added?

A. MAC address aging
B. MAC move
C. MAC address auto purge
D. dynamic MAC address learning


A. MAC address aging


The switching feature that removes unused MAC addresses from the MAC address table, allowing new MAC addresses to be added, is:

A. MAC address aging

MAC address aging is a feature commonly found in Ethernet switches. It is used to remove inactive or unused MAC addresses from the MAC address table after a certain period of time. By default, the MAC address table has a limited capacity, and if it becomes full, the switch may not be able to learn new MAC addresses. MAC address aging solves this problem by periodically checking the activity status of MAC addresses and removing those that have not been seen or used within a specific timeframe. This frees up space in the MAC address table, allowing new MAC addresses to be learned and added.

Option B, MAC move, refers to the process of a device with a specific MAC address moving from one port to another within a network. It does not specifically relate to removing unused MAC addresses.

Option C, MAC address auto purge, is not a standard term or feature in switching. It does not accurately describe the process of removing unused MAC addresses.

Option D, dynamic MAC address learning, is the process by which a switch learns MAC addresses by examining the source MAC addresses of incoming frames. It does not specifically address the removal of unused MAC addresses.

Therefore, the correct answer is A. MAC address aging.


Cisco Certified Network Associate (CCNA) 200-301 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Cisco Certified Network Associate (CCNA) 200-301 exam and earn Cisco Certified Network Associate (CCNA) 200-301 certification.

Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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