Nokia 4A0-112 Exam - Topic 4 Question 9 Discussion

Actual exam question for Nokia's 4A0-112 exam

Question #: 9
Topic #: 4

Refer to the exhibit.

Routers R1 through R4 in the diagram have established IS-IS adjacencies. Router R1 is L1/L2 and is the DIS of its two broadcast interfaces. How many LSPs will it generate?

Show Suggested Answer

Suggested Answer: B

During the IP forwarding process, routers use the routing table to determine the next hop based on the destination IP address. The source IP address is not directly involved in the lookup process for forwarding.

The ARP table is used to map IP addresses to MAC addresses, specifically for resolving the MAC address of the next hop (destination MAC address) for forwarding packets within the local network.

by Weldon at Mar 18, 2025, 02:33 PM

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Lacresha

2 months ago

I agree, 3 makes the most sense here.

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Laticia

2 months ago

Definitely 2 LSPs, that's how it works!

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Heidy

2 months ago

R1 will generate 3 LSPs.

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Cecil

3 months ago

Wait, how can it be 5? That seems off.

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Norah

3 months ago

I thought it was 4 LSPs, not sure about this.

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Daisy

3 months ago

I remember reading that the DIS generates one LSP for each interface, so maybe it's 4 if we count both broadcast interfaces?

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Lashon

3 months ago

I feel like it might be 3 LSPs since R1 is both L1 and L2, but I could be mixing it up with another topic.

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Gearldine

4 months ago

I think I practiced a similar question where the DIS generated extra LSPs, but I can't recall the exact number.

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Mayra

4 months ago

I remember that L1/L2 routers generate one LSP for each level, but I'm not sure if the DIS role affects that count.

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Marvel

4 months ago

Okay, I think I've got it. R1 is the DIS, so it's generating 1 LSP per broadcast interface. And since it's L1/L2, it's generating 1 LSP per level, per interface. That's 2 LSPs per interface, so a total of 4 LSPs. I'm feeling good about this one!

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Selma

4 months ago

Ugh, this question is tripping me up. I know R1 is the DIS, but I'm not sure how that affects the number of LSPs it generates. And I'm not totally clear on how the L1/L2 designation comes into play here. I'm going to have to review my IS-IS notes again before I can feel confident about this.

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Mitzie

4 months ago

I've got this! R1 is the DIS, so it's generating LSPs for its two broadcast interfaces. And since it's L1/L2, it's generating LSPs for both levels. That means it's generating 4 LSPs total.

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Dahlia

5 months ago

Okay, I'm a little confused here. If R1 is L1/L2, does that mean it's generating LSPs for both levels? And if it has two broadcast interfaces, does that mean it's generating 2 LSPs per level? I'm not sure, I'll have to think this through more carefully.

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Annice

5 months ago

Hmm, let me think about this. Since R1 is the DIS on its two broadcast interfaces, it should be generating LSPs for each of those interfaces, so I'm going to go with 2.

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Refugia

10 months ago

Alright, let's think this through step-by-step. R1 has 2 broadcast interfaces, so that's 2 LSPs. Plus the database summary, so 3 LSPs. And since it's the DIS, one more for that. 4 LSPs, got it!

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