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Juniper Exam JN0-351 Topic 7 Question 17 Discussion

Actual exam question for Juniper's JN0-351 exam
Question #: 17
Topic #: 7
[All JN0-351 Questions]

Which two mechanisms are part of building and maintaining a Layer 2 bridge table? (Choose two.)

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Suggested Answer: B, C

Option B is correct.Flooding is a mechanism used in Layer 2 bridging where the switch sends incoming packets to all its ports except for the port where the packet originated1.This is done when the switch doesn't know the destination MAC address or when the packet is a broadcast or multicast1.

Option C is correct.Learning is another mechanism used in Layer 2 bridging where the switch learns the source MAC addresses of incoming packets and associates them with the port on which they were received23.This information is stored in a MAC address table, also known as a bridge table23.

Option A is incorrect.Blocking is a state in Spanning Tree Protocol (STP) used to prevent loops in a network2.It's not a mechanism used in building and maintaining a Layer 2 bridge table2.

Option D is incorrect.Listening is also a state in Spanning Tree Protocol (STP) where the switch listens for BPDUs to make sure no loops occur in the network before transitioning to the learning state2.It's not a mechanism used in building and maintaining a Layer 2 bridge table2.


by Josphine at Apr 28, 2024, 05:46 AM

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Gerald
5 months ago
So, learning and flooding?
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Bettye
6 months ago
Flooding makes sense too. It broadcasts unknown MACs.
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Marylou
6 months ago
For sure, but what about flooding?
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Gerald
6 months ago
I think learning is definitely one part.
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Bettye
6 months ago
Yeah, it's about Layer 2 bridge table mechanisms.
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Gerald
6 months ago
This question is tricky, isn't it?
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