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Juniper Exam JN0-637 Topic 4 Question 10 Discussion

Actual exam question for Juniper's JN0-637 exam
Question #: 10
Topic #: 4
[All JN0-637 Questions]

Click the Exhibit button.

You have configured a CoS-based VPN that is not functioning correctly.

Referring to the exhibit, which action will solve the problem?

Show Suggested Answer Hide Answer
Suggested Answer: D

Comprehensive Detailed Step-by-Step Explanation with All Juniper Security Reference

Understanding the Problem:

A CoS-based VPN has been configured but is not functioning correctly.

The exhibit shows that under the class-of-service configuration, six forwarding classes are defined.

Forwarding Classes in the Exhibit:

best-effort

ef-class

af-class

network-control

res-class

web-data

Juniper CoS-Based VPN Limitations:

Maximum Number of Forwarding Classes: In CoS-based VPNs (Layer 3 VPNs), there is a limitation on the number of forwarding classes that can be used.

Supported Forwarding Classes: Only up to four forwarding classes are supported in an L3VPN for CoS purposes.

Additional Reference:

Juniper TechLibrary:

'Configuring Class of Service for MPLS VPNs' - Discusses CoS considerations and limitations in MPLS L3VPN deployments.

Source: Juniper TechLibrary - CoS for VPNs

Juniper Networks Day One Book:

'Deploying MPLS Layer 3 VPNs' - Provides insights into CoS limitations and best practices for VPN deployments.


Juniper Networks Documentation:

'For Layer 3 VPNs, the maximum number of forwarding classes supported is four. If you configure more than four forwarding classes, CoS functionality might not work as expected.'

Source: Juniper TechLibrary - Class of Service Limitations in VPNs

Issue Identification:

The VPN is not functioning correctly because it exceeds the maximum number of supported forwarding classes for a CoS-based VPN.

Solution:

Option D: You must delete one forwarding class.

By reducing the number of forwarding classes to four or fewer, the CoS-based VPN will comply with the limitations and function correctly.

Why Other Options Are Incorrect:

Option A: You must change the loss priorities of the forwarding classes to low.

Changing loss priorities does not affect the limitation on the number of forwarding classes.

The issue is not related to loss priority settings but to the number of forwarding classes.

Option B: You must change the code point for the DB-data forwarding class to 10000.

There is no forwarding class named DB-data in the exhibit.

Changing a code point does not address the issue of exceeding the maximum number of forwarding classes.

Option C: You must use inet precedence instead of DSCP.

Switching from DSCP to IP Precedence does not resolve the issue of having too many forwarding classes.

The limitation on the number of forwarding classes remains the same regardless of the classification method used.

Conclusion:

To resolve the issue with the CoS-based VPN not functioning correctly due to exceeding the maximum number of forwarding classes, you must delete forwarding classes to reduce the total number to four or fewer.

Contribute your Thoughts:

Melodie
7 days ago
I'm so hungry, I could eat a whole forwarding class right now. Maybe that's the solution - just devour one of them and the problem will go away!
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Cherilyn
8 days ago
This question is giving me a headache. I'm just going to guess and hope for the best. Option C maybe? Using inet precedence instead of DSCP sounds like a random guess, but hey, it could work!
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Princess
9 days ago
Hey, this looks like a tricky one! I'm going to have to go with option B. Changing the code point for the DB-data forwarding class to 10000 seems like the way to go. It's the only one that mentions a specific value.
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Kati
11 days ago
Hmm, I'm not sure about this one. Maybe option D would work, but deleting a forwarding class seems like a drastic measure. I'll have to think about this one a bit more.
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Johnna
25 days ago
Hmm, I see your point. But I still think A is the best option because it will help prioritize the traffic correctly.
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Iluminada
25 days ago
I disagree, I believe the correct answer is B) You must change the code point for the DB-data forwarding class to 10000.
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Carmen
25 days ago
I think the answer is A. Changing the loss priorities of the forwarding classes to low seems like the most logical solution to the problem.
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Fallon
5 days ago
User 2: I disagree, I believe the correct answer is B.
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Jaleesa
18 days ago
User 1: I think the answer is A.
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Johnna
1 months ago
I think the answer is A) You must change the loss priorities of the forwarding classes to low.
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