200-301 · Question #1346
200-301 Question #1346: Real Exam Question with Answer & Explanation
The correct answer is A: floods unknown destinations to all ports except the receiving port. When a switch receives a frame destined for an unknown MAC address, it floods the frame to all its ports, excluding the port it was received on, to ensure the frame reaches its intended recipient.
Question
How does frame switching function on a switch?
Options
- Afloods unknown destinations to all ports except the receiving port
- Bbuffers and forwards frames with less than 5 CRCs
- Cforwards frames to a neighbor port using CDP
- Dsends frames with unknown destinations to a multicast group
Explanation
When a switch receives a frame destined for an unknown MAC address, it floods the frame to all its ports, excluding the port it was received on, to ensure the frame reaches its intended recipient.
Common mistakes.
- B. The number of CRCs is not a standard forwarding criterion; frames with valid CRCs are forwarded, while corrupted ones are discarded.
- C. CDP (Cisco Discovery Protocol) is a Layer 2 protocol for discovering neighbor devices and their capabilities, not for forwarding user data frames.
- D. Frames with unknown unicast destinations are flooded to all ports (except ingress), not specifically sent to a multicast group.
Concept tested. Switch frame forwarding (unknown unicast)
Reference. https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/10570-41.html
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