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Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) Certification Exam is a professional-level certification offered by Juniper Networks for individuals who want to demonstrate their expertise in the field of service provider routing and switching technologies. Service Provider, Professional (JNCIP-SP) certification exam is designed to test the knowledge, skills, and abilities of candidates in configuring, verifying, and troubleshooting Juniper Networks service provider routing and switching technologies.

Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) Exam is a certification course that focuses on the knowledge and skills required for configuring and managing Juniper Networks Service Provider networks. JN0-664 Exam is designed for experienced service provider network professionals who wish to validate their advanced knowledge of Junos OS, networking technologies, and related platforms. The JN0-664 exam also covers a wide range of topics that help professionals to design, deploy, and troubleshoot advanced service provider networks.

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Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) Exam is a certification exam designed for individuals who wish to demonstrate their knowledge and expertise in Juniper Networks Service Provider Routing and Switching technologies. JN0-664 Exam is the second level of certification in the Juniper Networks Service Provider Routing and Switching track, and it is intended for networking professionals who have a solid understanding of networking protocols and technologies.

Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q38-Q43):

NEW QUESTION # 38
Exhibit

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

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

Answer: B,C

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.

NEW QUESTION # 39

Click the Exhibit hutton.
You are configuring an interprovider Option C Layer 3 VPN to connect two customer sites.
Referring to the exhibit, which three statements are correct? (Choose three.)

A. ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.
B. P routers maintain the internal routes from its own AS and the loopback address from the other AS PEs.
C. P routers only maintain the internal routes from their own AS.
D. ASBR routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.
E. PE routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.

Answer: A,C,E

Explanation:
Interprovider Option C for Layer 3 VPNs involves the use of Autonomous System Boundary Routers (ASBRs) to exchange labeled VPN-IPv4 routes between different Autonomous Systems (AS). This option requires BGP sessions between ASBRs, and the VPN routes are carried end-to-end using MPLS labels. Here' s a detailed analysis of the roles of different routers in this scenario:
1. **ASBR Routers**:
- ASBRs are responsible for exchanging VPN-IPv4 routes between different ASes.
- **A. ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.**
- Correct. ASBRs maintain routes to internal destinations within their own AS, and they also need to know the loopback addresses of PEs in the other AS to set up the BGP sessions and MPLS tunnels.
2. **PE Routers**:
- PE routers are responsible for maintaining VPN routes and label information to forward VPN traffic correctly.
- **B. PE routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.**
- Correct. PE routers need to maintain:
- Internal routes within their AS for routing.
- Loopback addresses of other AS PEs for establishing MPLS LSPs.
- L3VPN routes to provide end-to-end VPN connectivity.
3. **P Routers**:
- P routers are the core routers that do not participate in BGP VPN routing but forward labeled packets based on MPLS labels.
- **C. P routers only maintain the internal routes from their own AS.**
- Correct. P routers maintain the internal routing information to forward packets within the AS and use MPLS labels for forwarding VPN packets. They do not maintain VPN routes or routes from other ASes.
4. **Incorrect Statements**:
- **D. P routers maintain the internal routes from its own AS and the loopback address from the other AS PEs.
**
- Incorrect. P routers do not need to maintain the loopback addresses of other AS PEs. They only maintain internal routing and MPLS label information.
- **E. ASBR routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.**
- Incorrect. ASBR routers do not maintain L3VPN routes. They exchange labeled VPN-IPv4 routes with other ASBRs and forward them to PE routers.
**Conclusion**:
The correct answers are:
**A. ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.**
**B. PE routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.**
**C. P routers only maintain the internal routes from their own AS.**
**References**:
- Juniper Networks Documentation on Interprovider VPNs: [Interprovider VPN Configuration](https://www.
juniper.net/documentation/en_US/junos/topics/topic-map/mpls-vpn-interprovider.html)
- MPLS and VPN Architectures, CCIP Edition by Ivan Pepelnjak and Jim Guichard

NEW QUESTION # 40
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.)

A. 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
B. Add the external interface prefix to the IGP routing tables
C. Add the internal interface prefix to the BGP routing tables.
D. On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy

Answer: B,D

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.
The reason why the route is being hidden is that R5 cannot reach the BGP next hop 10.0.0.1, which is the address of R1. R5 does not have a route to 10.0.0.0/24 in its routing table, and neither does R4. Therefore, R5 cannot resolve the BGP next hop and marks the route as hidden.
There are two solutions that will solve this problem:
Option A: On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy. This way, R5 will receive the route with a next hop of 172.16.1.2, which is reachable via the IGP. This solution is also known as next-hop-self1.
Option B: Add the external interface prefix to the IGP routing tables. This way, R4 and R5 will learn a route to 10.0.0.0/24 via the IGP and be able to resolve the BGP next hop. This solution is also known as recursive lookup2.
Option C is not correct because adding the internal interface prefix to the BGP routing tables will not help R5 reach the BGP next hop 10.0.0.1.
Option D is not correct because changing the BGP next hop to 172.16.1.1 on R4 will not help R5 either, since R5 does not have a route to 172.16.1.1 in its routing table.
References: 1: Configuring Next-Hop-Self for IBGP Peers 2: Understanding Recursive Lookup

NEW QUESTION # 41
Exhibit

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

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

Answer: B,C

Explanation:
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.

NEW QUESTION # 42
Exhibit

You want to implement the BGP Generalized TTL Security Mechanism (GTSM) on the network Which three statements are correct in this scenario? (Choose three)

A. BGP GTSM requires a firewall filter to discard packets with incorrect TTL.
B. BGP GTSM requires a TTL of 1 to be configured between neighbors.
C. BGP GTSM requires a TTL of 255 to be configured between neighbors.
D. You can implement BGP GTSM between R2 and R1.
E. You can implement BGP GTSM between R2, R3, and R4

Answer: A,C,D

Explanation:
https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/ref/statement/multihop-edit-protocols- bgp.html

NEW QUESTION # 43
......

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