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The JN0-664 exam is a comprehensive assessment that covers a wide range of topics such as OSPF, IS-IS, BGP, MPLS, LDP, RSVP-TE, and more. Candidates are expected to have a deep understanding of the service provider network architecture, including core, edge, and access networks. They must also be familiar with advanced service provider technologies such as virtualization, automation, and software-defined networking.

Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) Certification Exam is a professional-level certification exam designed for network engineers and administrators who specialize in service provider networks. JN0-664 exam validates the skills needed to configure, manage, and troubleshoot Juniper Networks service provider routing platforms and networks.

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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q23-Q28):

NEW QUESTION # 23
You must alter class-of-service values in packets on the outbound interface of an edge router.
In this scenario, which CoS component allows you to accomplish this task?

A. scheduler
B. rewrite rules
C. output policer
D. forwarding classes

Answer: B

Explanation:
Class of Service (CoS) in networking is used to manage traffic by classifying, scheduling, and sometimes modifying packets to ensure network performance and Quality of Service (QoS). Different CoS components are used to achieve these goals. Let's analyze each option to determine which CoS component allows you to alter class-of-service values on the outbound interface of an edge router.
1. **Output Policer**:
- Policing is used to control the rate of traffic sent to or from a network interface. It can drop or remark traffic that exceeds a certain rate.
- Policing is not typically used to alter CoS values but to enforce traffic limits.
2. **Scheduler**:
- A scheduler is responsible for managing the order in which packets are transmitted out of an interface based on their CoS markings. It can allocate bandwidth and prioritize traffic.
- The scheduler manages how packets are queued and sent but does not alter the CoS values of packets.
3. **Rewrite Rules**:
- Rewrite rules are used to modify the CoS values of packets, such as DSCP (Differentiated Services Code Point) or 802.1p bits, as they exit an interface.
- Rewrite rules can alter the class-of-service values in the packet headers to match the desired policies of the outbound interface.
- Therefore, rewrite rules are the correct component for altering CoS values on an outbound interface.
4. **Forwarding Classes**:
- Forwarding classes are used to categorize packets into different traffic classes within a router for QoS handling.
- They help in defining how packets should be treated by the scheduler but do not directly modify the CoS values.
**Conclusion**:
To alter class-of-service values in packets on the outbound interface of an edge router, the correct CoS component to use is:
**C. rewrite rules**
**References**:
- Juniper Networks Documentation on CoS: [Class of Service Overview](https://www.juniper.net
/documentation/en_US/junos/topics/concept/class-of-service-overview.html)
- Junos OS CoS Configuration Guide: [Rewrite Rules](https://www.juniper.net/documentation/en_US/junos
/topics/topic-map/class-of-service-rewrite-rules.html)

NEW QUESTION # 24
When building an interprovider VPN, you notice on the PE router that you have hidden routes which are received from your BGP peer with family inet labeled-unica3t configured.
Which parameter must you configure to solve this problem?

A. Under the protocols ospf hierarchy, add the traffic-engineering parameter.
B. Under the family inet labeled-unicast hierarchy, add the resolve-vpn parameter.
C. Under the family inet labeled-unicast hierarchy, add the explicit null parameter.
D. Under the protocols mpls hierarchy, add the traffic-engineering parameter

Answer: B

Explanation:
The resolve-vpn parameter is a BGP option that allows a router to resolve labeled VPN-IPv4 routes using unlabeled IPv4 routes received from another BGP peer with family inet labeled-unicast configured. This option enables interprovider VPNs without requiring MPLS labels between ASBRs or using VRF tables on ASBRs. In this scenario, you need to configure the resolve-vpn parameter under [edit protocols bgp group external family inet labeled-unicast] hierarchy level on both ASBRs.

NEW QUESTION # 25

Click the Exhibit button.
You are troubleshooting an issue for a customer site that uses 10.10.0.0/24 in AS 65224, but you see another AS in the AS path.
Referring to the exhibit, what is the cause of the problem?

A. The local AS is receiving two equal cost routes to 10.10.0.0/24.
B. AS 65000 is pre-pending AS 65137 to route advertisements.
C. AS 65137 is advertising the 10.10.0.0/24 prefix.
D. The local AS is in the process of withdrawing the route from AS 65137.

Answer: B

Explanation:
In the given exhibit, you are observing the BGP routing information for the prefix 10.10.0.0/24. The AS path for this prefix shows `65000 {65137 65224}`. To understand the issue, let's analyze each aspect of the information provided and the options given:
1. **AS Path Analysis**:
- The AS path attribute in BGP is a list of AS numbers that a route advertisement has traversed.
- In this case, the AS path `65000 {65137 65224}` indicates that the route to 10.10.0.0/24 has been advertised through AS 65000, which includes AS 65137 and AS 65224.
2. **Understanding AS Path Prepending**:
- AS path prepending is a technique used by AS administrators to artificially lengthen the AS path.
- By adding their own AS number multiple times into the AS path, they make a route less attractive to others.
- Here, AS 65000 is showing `65137` as part of its AS path, suggesting it might be prepending to manipulate routing decisions.
3. **Options Analysis**:
- **Option A**: "AS 65000 is pre-pending AS 65137 to route advertisements."
- This option suggests that AS 65000 is deliberately adding AS 65137 to the AS path. This matches the observed AS path, where AS 65000 has prepended `65137`.
- Therefore, this is the correct explanation.
- **Option B**: "The local AS is receiving two equal cost routes to 10.10.0.0/24."
- There is no evidence in the exhibit to support the presence of two equal-cost routes.
- **Option C**: "The local AS is in the process of withdrawing the route from AS 65137."
- Route withdrawal would not cause the AS path to include `65000 {65137 65224}`.
- **Option D**: "AS 65137 is advertising the 10.10.0.0/24 prefix."
- While AS 65137 is part of the path, it does not explain the presence of AS 65000 in the path, making this option incorrect.
**Conclusion**:
The AS path `65000 {65137 65224}` is indicative of AS 65000 prepending AS 65137. Therefore, the correct answer is:
**A. AS 65000 is pre-pending AS 65137 to route advertisements.**
**References**:
- Juniper Networks documentation on BGP AS path manipulation and prepending techniques.
- BGP Best Practices and Routing Policies: [Juniper Networks BGP Best
Practices](https://www.juniper.net/documentation/en_US/junos/topics/concept/bgp-best-practices-routing-policie
- RFC 4271, A Border Gateway Protocol 4 (BGP-4): [RFC 4271](https://tools.ietf.org/html/rfc4271) which describes the behavior and attributes of BGP, including AS path prepending.

NEW QUESTION # 26
Exhibit

Referring to the exhibit, which statement is correct?

A. The route-diatinguisher configuration will stop routes from being shared between CE-1 and CE-2.
B. The vrf-target configuration will stop routes from being shared between CE-1 and CE-2.
C. The vrf-target configuration will allow routes to be shared between CE-1 and CE-2.
D. The route-distinguisher configuration will allow overlapping routes to be shared between CE-1 and CE-2.

Answer: C

Explanation:
In the exhibit, we see two VRF (Virtual Routing and Forwarding) instances, CE-1 and CE-2, configured on a Juniper router. Each VRF is associated with a route-distinguisher (RD) and a vrf-target value.
Understanding the Role of vrf-target
The vrf-target is used to define Route Targets (RT), which control the import and export of VPN routes in MPLS Layer 3 VPNs (L3VPNs).
If two VRFs share the same RT, they will import each other's routes, allowing communication between them.
In this case, both VRFs have the same vrf-target:
vrf-target target:65512:100;
Since both CE-1 and CE-2 have the same RT (65512:100), they will import and export each other's routes, enabling route sharing between them.
Understanding route-distinguisher (RD)
The RD (Route Distinguisher) only ensures uniqueness of overlapping IP prefixes within the MPLS network.
It does not control route sharing between VRFs.
In the exhibit, both VRFs have the same RD (65512:1), but this does not influence whether they share routes.
Correct Answer Selection
A (Correct): The vrf-target configuration enables route sharing between CE-1 and CE-2 since they have the same RT (65512:100).
B (Incorrect): The vrf-target does the opposite-it allows sharing, not blocking.
C (Incorrect): The route-distinguisher only provides unique route identification, but does not affect route sharing.
D (Incorrect): Again, route-distinguisher has no impact on route sharing.
Reference from Juniper Official Documentation
✅ Juniper Documentation - Junos MPLS VPNs Configuration Guide:
"Route targets (vrf-target) are used to control the import and export of VPN routes between different VRFs. VRFs with the same route target can import and export routes to each other, enabling inter-VRF communication." Thus, the correct answer is:
✅ A. The vrf-target configuration will allow routes to be shared between CE-1 and CE-2.

NEW QUESTION # 27
Which two statements describe PIM-SM? (Choose two)

A. Traffic is initially flooded to all routers and an S,G is maintained for each group
B. Traffic is only forwarded to routers that request to join the distribution tree.
C. Routers without receivers must periodically prune themselves from the SPT.
D. Routers with receivers send join messages to their upstream neighbors.

Answer: B,D

Explanation:
Explanation
PIM sparse mode (PIM-SM) is a multicast routing protocol that uses a pull model to deliver multicast traffic.
In PIM-SM, routers with receivers send join messages to their upstream neighbors toward a rendezvous point (RP) or a source-specific tree (SPT). The RP or SPT acts as the root of a shared distribution tree for a multicast group. Traffic is only forwarded to routers that request to join the distribution tree by sending join messages.
PIM-SM does not flood traffic to all routers or prune routers without receivers, as PIM dense mode does.

NEW QUESTION # 28
......

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