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Juniper JN0-664 Exam
Service Provider Routing and Switching, Professional (JNCIP-SP) (Page 7 )

Updated On: 1-Feb-2026
Page 2 of 14
PDF with 96 Questions

Exhibit.



Referring to the exhibit; the 10.0.0.0/24 EBGP route is received on R5; however, the route is being hidden.
What are two solutions that will solve this problem? (Choose two.)

  1. On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy
  2. Add the external interface prefix to the IGP routing tables
  3. Add the internal interface prefix to the BGP routing tables.
  4. On R4, create a policy to change the BGP next hop to 172.16.1.1 and apply it to IBGP as an export policy

Answer(s): A,B

Explanation:

the default behavior for iBGP is to propagate EBGP-learned prefixes without changing the next-hop. This can cause issues if the next-hop is not reachable via the IGP. One solution is to use the next-hop self command on R4, which will change the next-hop attribute to its own loopback address. This way, R5 can reach the next-hop via the IGP and install the route in its routing table. Another solution is to add the external interface prefix (120.0.4.16/30) to the IGP routing tables of R4 and R5. This will also make the next-hop reachable via the IGP and allow R5 to use the route. According to 2, this is a possible workaround for a pure IP network, but it may not work well for an MPLS network.



Which two statements are correct regarding bootstrap messages that are forwarded within a PIM sparse mode domain? (Choose two.)

  1. Bootstrap messages are forwarded only to routers that explicitly requested the messages within the PIM sparse-mode domain
  2. Bootstrap messages distribute RP information dynamically during an RP election.
  3. Bootstrap messages are used to notify which router is the PIM RP
  4. Bootstrap messages are forwarded to all routers within a PIM sparse-mode domain.

Answer(s): B,D

Explanation:

Bootstrap messages are PIM messages that are used to distribute rendezvous point (RP) information dynamically during an RP election. Bootstrap messages are sent by bootstrap routers (BSRs), which are routers that are elected to perform the RP discovery function for a PIM sparse-mode domain. Bootstrap messages contain information about candidate RPs and their multicast groups, as well as BSR priority and hash mask length. Bootstrap messages are forwarded to all routers within a PIM sparse-mode domain using hop-by-hop flooding.



Exhibit



Which two statements about the configuration shown in the exhibit are correct? (Choose two.)

  1. This VPN connects customer sites that use different AS numbers.
  2. This VPN connects customer sites that use the same AS number
  3. A Layer 2 VPN is configured.
  4. A Layer 3 VPN is configured.

Answer(s): A,D

Explanation:

The configuration shown in the exhibit is for a Layer 3 VPN that connects customer sites that use different AS numbers. A Layer 3 VPN is a type of VPN that uses MPLS labels to forward packets across a provider network and BGP to exchange routing information between PE routers and CE routers. A Layer 3 VPN allows customers to use different routing protocols and AS numbers at their sites, as long as they can peer with BGP at the PE-CE interface. In this example, CE-1 is using AS 65530 and CE-2 is using AS 65531, but they can still communicate through the VPN because they have BGP sessions with PE-1 and PE-2, respectively.



You are configuring a BGP signaled Layer 2 VPN across your MPLS enabled core network. In this scenario, which statement is correct?

  1. You must assign a unique site number to each attached site's configuration.
  2. This type of VPN only supports Ethernet interfaces when connecting to CE devices.
  3. This type of VPN requires the support of the inet-vpn NLRI on all core BGP devices
  4. You must use the same route-distinguiaher value on both PE devices.

Answer(s): C

Explanation:

BGP signaled Layer 2 VPN is a type of VPN that uses BGP to distribute VPN labels and information for Layer 2 connectivity between sites over an MPLS network. BGP signaled Layer 2 VPN requires the support of the l2vpn NLRI on all core BGP devices1. The l2vpn NLRI is a new address family that carries Layer 2 VPN information such as the VPN identifier, the attachment circuit identifier, and the route distinguisher. The l2vpn NLRI is used for both auto-discovery and signaling of Layer 2 VPNs2. In this scenario, we are configuring a BGP signaled Layer 2 VPN across an MPLS enabled core network. Therefore, we need to ensure that all core BGP devices support the l2vpn NLRI.


Reference:

https://www.juniper.net/documentation/us/en/software/junos/vpn- l2/topics/concept/vpn-layer-2-overview.html
https://www.cisco.com/c/en/us/td/docs/ios- xml/ios/mp_l2_vpns/configuration/xe-16/mp-l2-vpns-xe-16-book/vpls-bgp-signaling-l2vpn-inter-as- option-a.html



Exhibit



Referring to the exhibit, you are receiving the 192.168 0 0/16 route on both R3 and R4 from your EBGP neighbor You must ensure that R1 and R2 receive both BGP routes from the route reflector In this scenario, which BGP feature should you configure to accomplish this behavior?

  1. add-path
  2. multihop
  3. multipath
  4. route-target

Answer(s): A

Explanation:

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.


Reference:

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe- 16/irg-xe-16-book/bgp-additional-paths.html



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