200-301 · Question #1185
Which switching feature removes unused MAC addresses from the MAC address table, which allows new MAC addresses to be added?
The correct answer is A. MAC address aging. MAC address aging is a switching feature that automatically removes MAC address entries from the MAC address table if no traffic is seen from those addresses for a configured period.
Question
Which switching feature removes unused MAC addresses from the MAC address table, which allows new MAC addresses to be added?
Options
- AMAC address aging
- BMAC move
- CMAC address auto purge
- Ddynamic MAC address learning
How the community answered
(48 responses)- A88% (42)
- B2% (1)
- C6% (3)
- D4% (2)
Why each option
MAC address aging is a switching feature that automatically removes MAC address entries from the MAC address table if no traffic is seen from those addresses for a configured period.
MAC address aging ensures that the MAC address table remains current and does not become saturated with stale entries; entries for which no frames are received for a specified aging time are automatically flushed, freeing up space and improving table efficiency.
MAC move describes a scenario where a MAC address is learned on a new port, causing its entry to be updated, rather than removing an unused MAC address.
MAC address auto purge is not a standard or commonly recognized switching term for this feature; the correct term is MAC address aging.
Dynamic MAC address learning is the process of adding new MAC addresses to the table when frames are received, not the process of removing old, unused ones.
Concept tested: Switch MAC address aging
Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/consolidated/configuration_guide/b_consolidated_3850_3se_config_guide/b_consolidated_3850_3se_config_guide_chapter_01000.html#concept_3992019460594B0A824A456C9A20E040
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