200-301 · Question #358
200-301 Question #358: Real Exam Question with Answer & Explanation
The correct answer is C: It floods the frame to all interfaces except Fa0/1.. When a switch receives a frame with a destination MAC address not found in its MAC address table, it floods the frame out of all interfaces except the one it was received on.
Question
How does a switch process a frame received on Fa0/1 with the destination MAC address of 0e38.7363.657b when the table is missing the address?
Options
- Alt drops the frame immediately.
- BIt forwards the frame back out of interface Fa0/1.
- CIt floods the frame to all interfaces except Fa0/1.
- DIt holds the frame until the MAC address timer expires and then drops the frame.
Explanation
When a switch receives a frame with a destination MAC address not found in its MAC address table, it floods the frame out of all interfaces except the one it was received on.
Common mistakes.
- A. A switch does not drop frames simply because the destination MAC address is unknown; it floods them to ensure delivery.
Concept tested. Switch MAC address table learning and unknown unicast flooding
Reference. https://www.cisco.com/c/en/us/support/docs/lan-switching/ethernet-switching/10574-5.html
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