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Question 1 - JN0-664 discussion

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Exhibit

Referring to the exhibit, a working L3VPN exists that connects VPN-A sites CoS is configured correctly to match on the MPLS EXP bits of the LSP, but when traffic is sent from Site-1 to Site-2, PE-2 is not classifying the traffic correctly

What should you do to solve the problem?

A.
Configure the explicit-null statement on PE-1.
Answers
A.
Configure the explicit-null statement on PE-1.
B.
Configure the explicit-null statement on PE-2
Answers
B.
Configure the explicit-null statement on PE-2
C.
Configure VPN prefix mapping for the PE-1_to_PE-2 LSP
Answers
C.
Configure VPN prefix mapping for the PE-1_to_PE-2 LSP
D.
Set a static CoS value for the PE-1_to_PE-2 LSP
Answers
D.
Set a static CoS value for the PE-1_to_PE-2 LSP
Suggested answer: A

Explanation:

The explicit-null statement enables the PE router to send an MPLS label with a value of 0 (explicit null) instead of an IP header for packets destined to the VPN customer sites. This allows the penultimate hop router (the router before the egress PE router) to preserve the EXP bits of the MPLS label and pass them to the egress PE router.The egress PE router can then use these EXP bits to classify the traffic according to the CoS policy2. In this example, PE-1 should configure the explicit-null statement under [edit protocols mpls label-switched-path PE-1_to_PE-2] hierarchy level.

asked 18/09/2024
Ahmed Emad
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