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Exam 200-150 topic 1 question 15 discussion

Actual exam question from Cisco's 200-150
Question #: 15
Topic #: 1
[All 200-150 Questions]

What action does a switch take if the destination MAC address is unknown?

  • A. Discard frame
  • B. Send ICMP unreachable message to source
  • C. Flood packet on all ports
  • D. Compare destination IP address against an ACL to determine if it is permitted
  • E. Send gratuitous ARP on all ports and wait for reply before forwarding
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Suggested Answer: C 🗳️
"What happens though when the switch receives a frame with a destination MAC address that is not included in the table? In that case the switch will just broadcast/flood the frame with theunknown destination address to all of its ports (apart from the port where the frame came from).
This process is called unknown unicast flooding. "
http://telconotes.wordpress.com/2013/03/09/how-a-switch-works/
by snapper at Aug. 18, 2019, 6:08 p.m.

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snapper
5 years, 10 months ago
The given answer ("Flood packet on all ports") is wrong. It does NOT flood packets on all ports. First, it doesn't flood packets. It floods FRAMES. Second, it will flood frames out all ports EXCEPT the port the frame came in on.
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