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

Question

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

Answer

A. MAC address aging

Explanation

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.

Reference

• Cisco Business 220 Series Switches Administration Guide – Mac Address Tables [Cisco Business 220 Series Smart Switches] – Cisco
• Configuring MAC Address Tables – Cisco
• Cisco IOS LAN Switching Command Reference – mac address-group through revision [Support] – Cisco
• Solved: mac-address-table aging-time and port security – Cisco Community
• MAC Address Entry Learning and Aging – S1720, S2700, S5700, and S6720 V200R011C10 Configuration Guide – Ethernet Switching – Huawei

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.