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Nokia 4A0-113 Exam - Topic 9 Question 51 Discussion

A router receives an OSPF database description packet from a neighbor that references an LSA, which is already in the router's LSDB. The sequence number in the DBD packet is lower than the sequence number of the LSA in the LSDB.What action does the router take?
A) The router sends a link-state update to its neighbor.
B) The router sends a link-state acknowledgement to its neighbor.
C) The router updates the information in its LSDB with the information received from its neighbor.
D) The router sends a link-state request to its neighbor.
E) The router takes no action.

Nokia 4A0-113 Exam - Topic 9 Question 51 Discussion

Actual exam question for Nokia's 4A0-113 exam
Question #: 51
Topic #: 9
[All 4A0-113 Questions]

A router receives an OSPF database description packet from a neighbor that references an LSA, which is already in the router's LSDB. The sequence number in the DBD packet is lower than the sequence number of the LSA in the LSDB.

What action does the router take?

Show Suggested Answer Hide Answer
Suggested Answer: A

by Janey at Feb 02, 2023, 11:31 PM

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Gussie
8 months ago
That's interesting, I didn't know that!
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Cheryll
9 months ago
Nah, it actually takes no action if the seq number is lower.
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Xenia
9 months ago
Wait, are you sure? I thought it would update the LSDB.
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Peter
9 months ago
Totally agree with that!
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Sharee
9 months ago
The router sends a link-state acknowledgement to its neighbor.
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Lawana
9 months ago
I feel like the router should send a request for more recent info, but I can't recall if that's the right move in this scenario.
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Mozell
9 months ago
This seems similar to a practice question we did where the router just ignores the older LSA. I think it might be option E.
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Devon
9 months ago
I'm not entirely sure, but I remember something about the router not needing to take action if the sequence number is lower.
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Rikki
10 months ago
I think the router should send a link-state acknowledgment since it already has a newer LSA in its LSDB.
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Levi
10 months ago
Continuous integration is an important DevOps practice, so I'll need to make sure I understand the details to answer this properly.
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Dong
10 months ago
Okay, I think I've got a handle on this. The key is understanding the impact on the tablespace and whether any DML operations are allowed during the execution of the command.
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Martha
1 year ago
This question is a real head-scratcher. I bet the OSPF gurus are laughing at us mere mortals right now. Anyway, I'm sticking with option B.
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Mabel
1 year ago
I'm a bit confused here. If the sequence number is lower, does that mean the neighbor's information is outdated? I'll go with option B just to be safe.
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Tijuana
1 year ago
It's better to be safe and acknowledge the neighbor's outdated information.
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Jacqueline
1 year ago
That makes sense, acknowledging the outdated information is important.
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Rosann
1 year ago
I agree, sending a link-state acknowledgement is the correct action.
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Arminda
1 year ago
Neighbor's information is outdated if the sequence number is lower.
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Freeman
1 year ago
Haha, the router 'takes no action'? That's like a tech support person telling me to 'turn it off and on again'. I'm confident option B is the correct answer.
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Emiko
1 year ago
Wait, why would the router send a link-state update? The neighbor's information is outdated, so that doesn't make sense. I'm going with option B.
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Andra
1 year ago
Yeah, acknowledging the outdated information is the appropriate action here.
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Eleonore
1 year ago
Agreed, option B makes more sense. Acknowledgement is the way to go.
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Val
1 year ago
Neighbor's information is outdated, so sending an update doesn't make sense.
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Scarlet
1 year ago
Hmm, the sequence number is lower, so the router shouldn't update its LSDB. I think option B is the right choice here.
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Tresa
1 year ago
Okay, that makes sense. Option B it is.
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Edda
1 year ago
No, because the sequence number is lower, so acknowledging the packet is the right move.
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Billye
1 year ago
Got it, thanks for clarifying.
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Jeannetta
1 year ago
No, because the sequence number is lower, so acknowledging the packet is the right move.
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Phung
1 year ago
But wouldn't sending a link-state update be more appropriate?
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Keshia
1 year ago
But wouldn't sending a link-state update be more appropriate?
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Tayna
1 year ago
I agree, option B makes sense in this scenario.
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Audry
1 year ago
I agree, option B makes sense in this scenario.
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Leonie
1 year ago
I believe the correct answer is C) The router updates the information in its LSDB with the information received from its neighbor. It makes sense to keep the LSDB up to date.
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Iluminada
1 year ago
I agree with Freida. The router should update its LSDB to reflect the most recent information.
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Freida
1 year ago
I think the router updates the information in its LSDB with the information received from its neighbor.
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