Nokia 4A0-C02 Exam - Topic 10 Question 78 Discussion

Actual exam question for Nokia's 4A0-C02 exam

Question #: 78
Topic #: 10

Packets arrive at the VPRN SAP on PE1 with DSCP marking of all. According to the QoS policies applied at routers PE1, P, and PE2, what is the DSCP value of packets egressing router PE2? (All the SDPs are MPLS-encapsulated, and all interfaces are using their default trust states).

Aaf11

Baf12

Caf31

Daf33

Show Suggested Answer

Suggested Answer: B

by Shenika at Dec 22, 2023, 07:39 PM

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Fatima

8 months ago

Totally agree with af11, makes sense with the default trust states.

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Nobuko

8 months ago

Wait, are we sure about that? I thought it was af33!

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Erick

8 months ago

Definitely af31, that's the standard for MPLS.

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Francoise

9 months ago

I think it should be af12, not sure about af11.

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Kiera

9 months ago

PE2 will egress with af11 based on the policies.

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Azalee

9 months ago

I think I remember that PE1 applies some marking based on the incoming DSCP, but I’m not clear on how that translates to PE2. I hope I can remember the right mappings!

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Richelle

9 months ago

I feel a bit confused about the specific mappings for AF classes. I think AF11 and AF12 are lower priority, but I can't recall which one would be correct here.

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Isaiah

9 months ago

This question seems similar to one we practiced where we had to determine DSCP values after passing through multiple routers. I think the default trust state means the original DSCP should remain intact.

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Junita

9 months ago

I remember studying DSCP values and how they map to different QoS classes, but I'm not sure how the MPLS encapsulation affects the egressing packets.

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Kattie

9 months ago

This seems straightforward. The key is understanding how the QoS policies are applied at each router. If I can map out the DSCP value changes, I should be able to determine the final DSCP value at PE2.

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Albina

10 months ago

Okay, I think I've got this. The packets arrive at PE1 with DSCP marking of all, so the QoS policy at PE1 must be modifying that. Then the MPLS encapsulation and trust state at the other routers will also impact the final DSCP value. I'll work through it step-by-step.

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Nu

10 months ago

This looks like a tricky DSCP marking question. I'll need to carefully review the QoS policies applied at each router to determine the final DSCP value.

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Maurine

10 months ago

Hmm, I'm a bit confused by the wording of the question. I'll need to make sure I understand the MPLS encapsulation and default trust state details before I can answer this.

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Hobert

10 months ago

I've got a good handle on IPv6 routing, so I think I can figure this out. I'll carefully consider each answer choice and match it to the information given in the question.

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Zona

10 months ago

This looks like a tricky question about the item master. I'll need to carefully read through each statement and think about what I know about item master organizations and attributes.

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