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Juniper JN0-664 certification exam is a computer-based test that consists of 65 multiple-choice questions. Candidates have 120 minutes to complete the exam, and they must achieve a passing score of 65% or higher to earn the certification. JN0-664 Exam is administered by Pearson VUE, and it can be taken at any Pearson VUE testing center worldwide.

Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q36-Q41):

NEW QUESTION # 36
Exhibit

You are running a service provider network and must transport a customer's IPv6 traffic across your IPv4-based MPLS network using BGP You have already configured mpis ipv6-tunneling on your PE routers.
Which two statements are correct about the BGP configuration in this scenario? (Choose two.)

A. You must configure family inet6 add-path between PE and CE routers.
B. You must configure family inet6 unicast between PE routers.
C. You must configure family inet6 unicast between PE and CE routers.
D. You must configure family inet6 labeled-unicast between PE routers.

Answer: C,D

Explanation:
To transport IPv6 traffic over an IPv4-based MPLS network using BGP, you need to configure two address families: family inet6 labeled-unicast and family inet6 unicast. The former is used to exchange IPv6 routes with MPLS labels between PE routers, and the latter is used to exchange IPv6 routes without labels between PE and CE routers. The mpis ipv6-tunneling command enables the PE routers to encapsulate the IPv6 packets with an MPLS label stack and an IPv4 header before sending them over the MPLS network.

NEW QUESTION # 37
Your organization manages a Layer 3 VPN for multiple customers To support advanced route than one BGP community on advertised VPN routes to remote PE routers.
Which routing-instance configuration parameter would support this requirement?

A. vrf-target import
B. vrf-import
C. vrf-export
D. vrf-target export

Answer: D

Explanation:
The vrf-target export parameter is used to specify one or more BGP extended community attributes that are attached to VPN routes when they are exported from a VRF routing instance to remote PE routers. This parameter allows you to control which VPN routes are accepted by remote PE routers based on their import policies. You can specify more than one vrf-target export value for a VRF routing instance to support advanced route filtering or route leaking scenarios.

NEW QUESTION # 38
Which three statements about IS-IS in a multi-area network are correct? (Choose three.)

A. External L2 PDUs are only flooded to the local area's L2 routers.
B. Internal L1 PDUs are flooded to all L1 routers in other areas.
C. External L2 PDUs are flooded to all L2 routers in other areas.
D. Internal L1 PDUs are flooded to the local area's L2 routers.
E. Internal L1 PDUs are only flooded to the local area's L1 routers.

Answer: C,D,E

Explanation:
Intermediate System to Intermediate System (IS-IS) is a link-state routing protocol designed to move information efficiently within a computer network, a group of physically connected computers or similar devices. It operates in two levels, Level 1 (L1) and Level 2 (L2), and supports hierarchical routing within a multi-area network.
Let's analyze each statement to determine its correctness in the context of IS-IS multi-area networks.
1. **Statement A: Internal L1 PDUs are flooded to the local area's L2 routers.**
- This statement is correct. L1 PDUs (Protocol Data Units) are flooded within the L1 area and also to the L2 routers that are present in the same area. These L2 routers act as the boundary routers that connect the local L1 area to other L1 areas via L2.
2. **Statement B: External L2 PDUs are flooded to all L2 routers in other areas.**
- This statement is correct. L2 PDUs are flooded throughout the entire L2 backbone, which includes all L2 routers in different areas. This ensures that inter-area routing information is shared across the network.
3. **Statement C: Internal L1 PDUs are flooded to all L1 routers in other areas.**
- This statement is incorrect. Internal L1 PDUs are only flooded within the local L1 area. They do not cross L1 area boundaries; inter-area communication is handled by L2 routers.
4. **Statement D: Internal L1 PDUs are only flooded to the local area's L1 routers.**
- This statement is correct. Internal L1 PDUs are indeed only flooded within their local L1 area, and do not go beyond it.
5. **Statement E: External L2 PDUs are only flooded to the local area's L2 routers.**
- This statement is incorrect. External L2 PDUs are flooded to all L2 routers throughout the IS-IS network, not just to those in the local area. This allows L2 routers to maintain a complete map of the network's topology.
**Conclusion**:
Given the analysis, the correct answers are:
**A. Internal L1 PDUs are flooded to the local area's L2 routers.**
**B. External L2 PDUs are flooded to all L2 routers in other areas.**
**D. Internal L1 PDUs are only flooded to the local area's L1 routers.**
**Reference**:
- Juniper Networks Documentation on IS-IS: [IS-IS Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/is-is-routing-overview.html)
- RFC 1195, Use of OSI IS-IS for Routing in TCP/IP and Dual Environments: [RFC 1195](https://tools.ietf.org/html/rfc1195) which details the operation of IS-IS in multi-area networks.

NEW QUESTION # 39

Click the Exhibit button.
Referring to the exhibit, which two statements are correct about BGP routes on R3 that are advertised to R1?
(Choose two.)

A. By default, the next-hop value for these routes is changed by R3 before being sent to R1.
B. By default, all BGP attributes values must be removed before advertising the routes to R1.
C. By default, the next-hop value for these routes is not changed by R3 before being sent to R1.
D. By default, the BGP local-preference value that is assigned on R3 is advertised to R1.

Answer: C,D

Explanation:
In the exhibit, we see an internal BGP (iBGP) setup within AS 65512, and an external BGP (eBGP) connection between R3 and ISP-A (AS 65511). The questions focus on the behavior of BGP routes advertised from R3 to R1 within the same AS.
1. **BGP Next-Hop Attribute (Option A and D)**:
- In iBGP, the next-hop attribute is **not** changed when a route is advertised to another iBGP peer. This means that when R3 advertises a route to R1, it retains the original next-hop value as learned from the eBGP peer (ISP-A).
- Therefore, Option D is correct: "By default, the next-hop value for these routes is not changed by R3 before being sent to R1."
2. **BGP Attributes (Option B and C)**:
- BGP attributes such as local preference, AS-path, and others are crucial for BGP route selection. The local preference attribute is used within an AS to indicate the preferred path for outbound traffic.
- When R3 advertises BGP routes to R1, it includes the local preference value assigned to those routes. This value is not removed and is propagated within the iBGP mesh.
- Therefore, Option C is correct: "By default, the BGP local-preference value that is assigned on R3 is advertised to R1."
**References**:
- Juniper Networks documentation on BGP behavior provides detailed insights into the propagation of BGP attributes within iBGP and eBGP contexts. Specifically, the Junos OS documentation covers the default behavior of next-hop and local preference attributes in BGP configurations.
- Junos OS BGP Configuration Guide: [Junos OS BGP Configuration Guide](https://www.juniper.net
/documentation/en_US/junos/topics/concept/bgp-overview.html)
- For a deeper understanding of BGP attributes and their default behaviors, the "Juniper Networks Day One:
Exploring BGP" book is an excellent resource.

NEW QUESTION # 40
You are attempting to summarize routes from the 203.0.113.128/25 IP block on R8 to AS 64500.
You implement the export policy shown in the exhibit and all routes from the routing table stop being advertised.
In this scenario, which two steps would you take to summarize the route in BGP? (Choose two.)

A. Add the set routing-options aggregate route 203.0.113.128/25 command.
B. Add the set protocols bgp family inet unicast add-path command to allow additional routes to the RIB tables.
C. Replace exact in the export policy with orlonger.
D. Remove the from protocol bgp command from the export policy.

Answer: A,C

NEW QUESTION # 41
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