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Nokia 4A0-100 Exam - Topic 9 Question 49 Discussion

Router R3 receives an LSA with the sequence number 111 from router R4 and then receives another copy of the LSA with a sequence number 112 from router R2. What does router R3 do with the LSA from R2?
C) R3 discards the LSA received from R2 and sends an ACK to R2.
A) R3 discards the LSA received from R2 and sends a copy of the LSA from its link state base to R2.
B) R3 installs the LSA received from R2 in its link state database and floods a copy to its neighbors.
D) R3 installs the LSA received from R2 in its link state database, sends an ACK to R2, and floods a copy to its neighbors.

Nokia 4A0-100 Exam - Topic 9 Question 49 Discussion

Actual exam question for Nokia's 4A0-100 exam
Question #: 49
Topic #: 9
[All 4A0-100 Questions]

Router R3 receives an LSA with the sequence number 111 from router R4 and then receives another copy of the LSA with a sequence number 112 from router R2. What does router R3 do with the LSA from R2?

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Suggested Answer: C

by Fletcher at May 06, 2022, 06:50 PM

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Rosina
7 months ago
Yep, R3 just keeps the latest LSA for accuracy!
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Ashlyn
7 months ago
Just to clarify, R3 sends an ACK to R2, right?
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Avery
7 months ago
Wait, are we sure about that? I thought R3 might install it instead.
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Belen
8 months ago
Totally agree, sequence numbers matter!
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Marilynn
8 months ago
R3 will discard the LSA from R2 since it has a lower sequence number.
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Stephaine
8 months ago
I feel like R3 would send an ACK to R2 if it discards the LSA, but I can't recall if that's the right choice here.
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Mitsue
8 months ago
I remember a practice question where the router installed the LSA if it was newer, so maybe R3 installs the one from R2?
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Truman
8 months ago
I think R3 should discard the LSA from R2 since it already has a newer one from R4, but I'm not entirely sure.
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Shantay
8 months ago
I’m leaning towards option D because it seems like R3 should acknowledge and flood the new LSA, but I need to double-check the sequence number rules.
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Cheryl
8 months ago
Incremental backup is the way to go on this type of question. I've seen it come up before on exams.
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