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Exam JN0-663 topic 1 question 3 discussion

Actual exam question from Juniper's JN0-663
Question #: 3
Topic #: 1
[All JN0-663 Questions]


Referring to the exhibit, hosts in Site 1 and Site 2 are unable to communicate with each other through the Layer 3 VPN.
What is the problem?

  • A. The two sites are in the same AS.
  • B. The two sites are using the same instance type.
  • C. The two sites are using the same route target.
  • D. The two sites are using the same route distinguisher.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by Juniperguy at Aug. 12, 2021, 11:45 p.m.

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Juniperguy
Highly Voted 3 years, 8 months ago
As both routers are in the same AS: 65111, the PE wont export the route from the other CE, because it sees itself in the path. To overcome this as-override, has to be used, or put the customer in different AS. So answer A
upvoted 14 times
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NinjaCloud
Most Recent 2 years, 11 months ago
In case the PE see same ASN in the ASPATH the route is rejected to avoid any loop. The loop prevention mechanisms that PE can use: - as-override - advertise-peer-as - remove-private
upvoted 3 times
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kasqureshi
2 years, 11 months ago
A. The AS is same at both ends so, CE will reject the route seeing its own AS in the BGP update.
upvoted 1 times
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DirkBaert
3 years, 6 months ago
Correct = D, RD must be different on each PE
upvoted 2 times
kasqureshi
2 years, 11 months ago
RDs can be same for a vpn instance. A is the answer.
upvoted 1 times
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dodds
3 years, 4 months ago
I think the answer is A. RD can be the same on each PE. It must be different for each vrf.
upvoted 2 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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