Juniper Exam JN0-664 Topic 4 Question 8 Discussion

Actual exam question for Juniper's JN0-664 exam

Question #: 8
Topic #: 4

Exhibit

Referring to the exhibit, CE-1 is providing NAT services for the hosts at Site 1 and you must provide Internet access for those hosts

Which two statements are correct in this scenario? (Choose two.)

AYou must configure a static route in the main routing instance for the 10 1 2.0/24 prefix that uses the VPN-A.inet.0 table as the next hop

BYou must configure a static route in the main routing instance for the 203.0.113.1/32 prefix that uses the VPN-A.inet.0 table as the next hop.

CYou must configure a RIB group on PE-1 to leak a default route from the inet.0 table to the VPN-A.inet.0 table.

DYou must configure a RIB group on PE-1 to leak the 10 1 2.0/24 prefix from the VPN-A.inet.0 table to the inet.0 table.

Show Suggested Answer

Suggested Answer: A

BGP add-path is a feature that allows the advertisement of multiple paths through the same peering session for the same prefix without the new paths implicitly replacing any previous paths. This behavior promotes path diversity and reduces multi-exit discriminator (MED) oscillations. BGP add-path is implemented by adding a path identifier to each path in the NLRI. The path identifier can be considered as something similar to a route distinguisher in VPNs, except that a path ID can apply to any address family.Path IDs are unique to a peering session and are generated for each network3. In this question, we have a route reflector (RR) that receives two routes for the same prefix (192.168.0.0/16) from an EBGP neighbor. By default, the RR will only advertise its best path to its clients (R1 and R2). However, we want R1 and R2 to receive both routes from the RR. To achieve this, we need to configure BGP add-path on the RR and enable it to send multiple paths for the same prefix to its clients.

by Yvonne at Jul 09, 2023, 04:42 AM

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Dorothea

9 hours ago

Hmm, I'm not convinced. Wouldn't it be better to leak a default route from the inet.0 table to the VPN-A.inet.0 table instead? That way the hosts at Site 1 can access the Internet without having to configure a bunch of static routes.

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Jenise

22 days ago

Hold on, I'm not sure about that. Shouldn't we also configure a static route for the 203.0.113.1/32 prefix? That's the gateway for the Internet, right?

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Tabetha

25 days ago

I'm not sure about option C though. Do we really need to configure a RIB group on PE-1 to leak a default route?

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1 months ago

I think option A is correct because we need a static route for the 10.1.2.0/24 prefix.

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