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Nokia 4A0-105 Exam - Topic 7 Question 128 Discussion

In IEEE 802.1ag, how are loops detected?
B) The MEP sees its own CFM frames returned to itself.
A) Spanning-tree BPDUs are returned to the sender.
C) This is not a function of IEEE 802.lag but of 802.1D
D) The record field of the CFM frame keeps track of chassis-mac addresses.

Nokia 4A0-105 Exam - Topic 7 Question 128 Discussion

Actual exam question for Nokia's 4A0-105 exam
Question #: 128
Topic #: 7
[All 4A0-105 Questions]

In IEEE 802.1ag, how are loops detected?

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Suggested Answer: B

by Sommer at Jun 16, 2026, 05:59 AM

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Tamekia
13 days ago
C makes sense too. It’s about 802.1D, not 802.1ag.
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Portia
18 days ago
I’m leaning towards A. BPDUs are crucial for loop detection.
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Claudio
23 days ago
I think B is correct. The MEP needs to see its own frames.
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Jacob
28 days ago
D is interesting, but I’m not sure how it fits in.
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Devora
1 month ago
Wait, really? I didn't know that about CFM frames!
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Graciela
1 month ago
C is totally right, loops are 802.1D stuff.
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Gilberto
1 month ago
I thought it was A? Spanning-tree BPDUs are key!
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Cory
2 months ago
B is correct! MEP sees its own frames.
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Goldie
2 months ago
I vaguely recall that 802.1D deals with spanning tree, so I don't think that's what we're looking for here.
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Ryann
2 months ago
I feel like this question is similar to one we practiced about CFM frames, and I think option B is the right answer.
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Joseph
2 months ago
I remember something about BPDUs in spanning-tree, but I don't think that's related to 802.1ag.
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Nicholle
2 months ago
I think loops are detected when the MEP sees its own CFM frames returned, but I'm not entirely sure.
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