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Exam JN0-664 topic 1 question 17 discussion

Actual exam question from Juniper's JN0-664
Question #: 17
Topic #: 1
[All JN0-664 Questions]

You are configuring a BGP signaled Layer 2 VPN across your MPLS enabled core network. Your PE-2 device connects to two sites within the same VPN.
In this scenario, which statement is correct?

  • A. You must create a unique Layer 2 VPN routing instance for each site on the PE-2 device.
  • B. By default on PE-2, the site’s local ID is automatically assigned a value of 0 and must be configured to match the total number of attached sites.
  • C. You must use separate physical interfaces to connect PE-2 to each site.
  • D. By default on PE-2, the remote site IDs are automatically assigned based on the order that you add the interfaces to the site configuration.
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Suggested Answer: D 🗳️
by daff177 at Feb. 23, 2024, 12:59 p.m.

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zineeddine
Highly Voted 9 months ago
Selected Answer: D
BGP Layer 2 VPNs use BGP to distribute endpoint provisioning information and set up pseudowires between PE devices. BGP uses the Layer 2 VPN (L2VPN) Routing Information Base (RIB) to store endpoint provisioning information, which is updated each time any Layer 2 virtual forwarding instance (VFI) is configured. The prefix and path information is stored in the L2VPN database, which allows BGP to make decisions about the best path. In BGP Layer 2 VPNs, each site has a unique site ID that identifies it within a VFI. The site ID can be manually configured or automatically assigned by the PE device. By default, the site ID is automatically assigned based on the order that you add the interfaces to the site configuration. The first interface added to a site configuration has a site ID of 1, the second interface added has a site ID of 2, and so on.
upvoted 6 times
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daff177
Most Recent 9 months, 1 week ago
D i assume
upvoted 1 times
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