Cisco
200-150 · Question #107
200-150 Question #107: Real Exam Question with Answer & Explanation
The correct answer is B: All frames generated within the Layer 2 domain will be flooded unless the destination is contained. When a switch MAC address table is full, frames for unknown destinations are flooded while frames for MAC addresses already in the table are still forwarded normally.
Cisco Data Center Networking Technologies
Question
A network engineer notices that the MAC address table on a network switch is full. What type of Layer 2 network behavior will occur while the network MAC address table remains full?
Options
- AAll frames generated within the Layer 2 domain will be flooded, regardless of the destination or
- BAll frames generated within the Layer 2 domain will be flooded unless the destination is contained
- CThe switch will reset the MAC address table, removing all existing learned MAC addresses.
- DThe switch will automatically reduce the aging time of the MAC address table.
Explanation
When a switch MAC address table is full, frames for unknown destinations are flooded while frames for MAC addresses already in the table are still forwarded normally.
Common mistakes.
- A. Flooding does not occur regardless of destination - frames for MAC addresses already present in the full table are still forwarded normally, not flooded.
- C. Cisco switches do not automatically reset or clear the MAC address table upon reaching capacity; existing entries persist until they age out naturally.
- D. Automatically reducing the MAC address table aging time is not a standard built-in response to a full MAC table on Cisco switches.
Concept tested. Switch MAC address table overflow and unknown unicast flooding
Reference. https://www.cisco.com/c/en/us/support/docs/lan-switching/ethernet/10596-84.html
Topics
#MAC address table#CAM table overflow#frame flooding#Layer 2 behavior
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