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Exam 200-301 topic 1 question 13 discussion

Actual exam question from Cisco's 200-301
Question #: 13
Topic #: 1
[All 200-301 Questions]

What is the default behavior of a Layer 2 switch when a frame with an unknown destination MAC address is received?

  • A. The Layer 2 switch forwards the packet and adds the destination MAC address to its MAC address table.
  • B. The Layer 2 switch sends a copy of a packet to CPU for destination MAC address learning.
  • C. The Layer 2 switch floods packets to all ports except the receiving port in the given VLAN.
  • D. The Layer 2 switch drops the received frame.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️

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therandman
Highly Voted 4 years, 10 months ago
Sometimes called BUM traffic - Broadcast, Unknown Unicast, Multicast. These forms of traffic are "flooded" out all ports except the port the packet was received on.
upvoted 27 times
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ZUMY
Highly Voted 4 years ago
C is correct. Whenever a switch receive a frame, it look f MAC address table for a matching entry and if not found ,switch will forward to (Flood) all the ports in the switch except the port that received.
upvoted 15 times
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TomGreen41
Most Recent 4 weeks ago
Selected Answer: C
C is correct
upvoted 1 times
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Lao_Zhao
1 month, 1 week ago
Selected Answer: C
L2 switch flooding
upvoted 1 times
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Ginzo
1 month, 2 weeks ago
Selected Answer: C
C, but the wording should be "frame" and not "Packet". Frames are layer 2 and packets are layer 3.
upvoted 1 times
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alylong
5 months ago
Selected Answer: C
C is correct. It will flooded the frame out all ports except the port the packet was received on.
upvoted 1 times
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Trainee1
10 months, 3 weeks ago
C is correct and there is STP that helps to send the packets in designated ports to avoid collusions in the vlan.
upvoted 1 times
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[Removed]
1 year ago
Selected Answer: C
C is correct
upvoted 3 times
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KuyaErik101
1 year, 1 month ago
Selected Answer: C
Correct
upvoted 1 times
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pumaa
1 year, 2 months ago
C is definitely wrong............... if you are not studying well.
upvoted 1 times
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duongccna
1 year, 7 months ago
C, flood all port, except port was received
upvoted 1 times
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Hanagaki_Shinjiro
1 year, 8 months ago
C is corect, it can cause flooding
upvoted 1 times
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MSTAHIR
1 year, 9 months ago
Selected Answer C, unknown destination address, switch flood the frame to its all ports except the received one in the same VLAN.
upvoted 1 times
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[Removed]
2 years, 4 months ago
Selected Answer: C
Ref: Introduction to Networks Companion Guide (CCNAv7) “Chapter 7 Ethernet Switching … The MAC Address Table … Find the Destination MAC Address If the destination MAC address is a unicast address, the switch looks for a match between the destination MAC address of the frame and an entry in its MAC address table. If the destination MAC address is in the table, the switch forwards the frame out the specified port. If the destination MAC address is not in the table, the switch forwards the frame out all ports except the incoming port. This is called an unknown unicast. …”
upvoted 2 times
Omooba_Adeposi
1 year, 3 months ago
Helpful share, thanks
upvoted 1 times
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Masquerade
2 years, 4 months ago
Selected Answer: C
Answer is C. The Layer 2 switch floods packets to all ports except the receiving port in the given VLAN. When a Layer 2 switch receives a frame with an unknown destination MAC address, it will flood the frame to all ports in the same VLAN, except for the port from which the frame was received. This is done so that the destination device can receive the frame and respond with its MAC address.
upvoted 1 times
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msomali
3 years ago
Switches Flood traffic with unknown destination MAC Address out all ports apart from the one it received, They do not forward. They will only forward if the destination MAC Address is in the CAM Table. So from the question the keyword is "UNKNOWN MAC ADDRESS" and Letter C has the Keyword "FLOOD" thus C is the correct answer
upvoted 1 times
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npettijohn
3 years, 5 months ago
I would also like to add that if the source MAC address is not in the CAM table, then it will be added.
upvoted 1 times
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