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Exam JN0-663 topic 1 question 46 discussion

Actual exam question from Juniper's JN0-663
Question #: 46
Topic #: 1
[All JN0-663 Questions]


Referring to the exhibit, you need to implement VPLS between CE-A1 and CE-A2. You must ensure that no loops are created due to the multihoming of the connection from CE-A2 to PE2 and PE3.
Based on the type of VPLS, which two solutions will satisfy this requirement? (Choose two.)

  • A. In an LDP VPLS, configure a primary and backup neighbor.
  • B. In an LDP VPLS, configure multihoming and local preference on PE-2 and PE-3.
  • C. In a BGP VPLS, configure multihoming and local preference on PE-2 and PE-3.
  • D. In a BGP VPLS, configure a primary and backup neighbor.
Show Suggested Answer Hide Answer
Suggested Answer: AC 🗳️
by t567 at Aug. 16, 2021, 3:17 a.m.

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ztw3587t
1 year, 6 months ago
Selected Answer: AC
Is possible to Enable loop protection on that scenarios: 1 - Multihoming and local preference (BGP VPLS only) 2 - Primary and backup neighbor (LDP VPLS only) Because of that the correct asnwers are A and C.
upvoted 1 times
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mohdema
1 year, 11 months ago
Selected Answer: CD
https://www.juniper.net/documentation/us/en/software/junos/vpn-l2/topics/concept/vpns-configuring-vpls-multihoming.html If you want to enable multihoming for a VPLS routing instance, you cannot also enable LDP signaling. You can only enable BGP signaling.
upvoted 1 times
ztw3587t
1 year, 5 months ago
@modema The question is clear "Based on the type", i.e, for LDP-Signaled type is necessary to use primary/backup (Answer A) and for BGP-signaled type is necessary to use multihoming / local preference (Answer C).
upvoted 1 times
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Sparks026
2 years ago
Options A & C are correct - https://supportportal.juniper.net/s/article/MX-Example-Configuring-LDP-based-VPLS-using-primary-backup-for-redundancy?language=en_US https://www.juniper.net/documentation/us/en/software/junos/vpn-l2/topics/topic-map/vpls-bgp-multihoming.html
upvoted 1 times
mohdema
1 year, 11 months ago
In your link it clearly says : If you want to enable multihoming for a VPLS routing instance, you cannot also enable LDP signaling. You can only enable BGP signaling.
upvoted 1 times
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dodds
2 years, 6 months ago
A and C are correct, i think. It's in JI2V student guide
upvoted 3 times
mohdema
1 year, 11 months ago
If you want to enable multihoming for a VPLS routing instance, you cannot also enable LDP signaling. You can only enable BGP signaling.
upvoted 1 times
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nyanko
2 years, 8 months ago
The A might mean the following although both LDP and BGP are required. https://www.juniper.net/documentation/us/en/software/junos/vpn-l2/topics/topic-map/vpls-bgp-multihoming.html#example-configuring-vpls-multihoming-fec-1066
upvoted 1 times
mohdema
1 year, 11 months ago
You would need autodiscovery for that
upvoted 1 times
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mohdema
1 year, 11 months ago
If you want to enable multihoming for a VPLS routing instance, you cannot also enable LDP signaling. You can only enable BGP signaling.
upvoted 1 times
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oceans1908
2 years, 9 months ago
CD only possible with BGP configure primary and secondary and multihoming
upvoted 2 times
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t567
3 years, 3 months ago
If you want to enable multihoming for a VPLS routing instance, you cannot also enable LDP signaling. You can only enable BGP signaling.
upvoted 2 times
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C (25%)
B (20%)
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