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Juniper JN0-664 Exam is a professional-level certification exam for service provider professionals seeking to advance their careers. JN0-664 exam is designed to test the candidate's knowledge and skills in configuring and troubleshooting Junos-based service provider routing platforms and networks. Passing the exam validates the candidate's expertise in designing, implementing, and maintaining Juniper Networks service provider networks.

Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) certification exam is designed to validate the knowledge and skills of network professionals working in service provider environments. Service Provider, Professional (JNCIP-SP) certification is intended for individuals who have experience in configuring and troubleshooting Juniper Networks products and solutions in service provider networks. The JNCIP-SP certification helps professionals to demonstrate their expertise in designing, implementing, and managing Juniper-based service provider networks.

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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q82-Q87):

NEW QUESTION # 82
Refer to the exhibit.

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. P routers maintain the internal routes from its own AS and the loopback address 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.
D. ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.
E. ASBR routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.

Answer: B,C,D

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.**
**Reference**:
- 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 # 83
You are responding to an RFP for a new MPLS VPN implementation. The solution must use LDP for signaling and support Layer 2 connectivity without using BGP The solution must be scalable and support multiple VPN connections over a single MPLS LSP The customer wants to maintain all routing for their Private network In this scenario, which solution do you propose?

A. LDP Layer 2 circuit
B. circuit cross-connect
C. BGP Layer 2 VPN
D. translational cross-connect

Answer: A

Explanation:
AToM (Any Transport over MPLS) is a framework that supports various Layer 2 transport types over an MPLS network core. One of the transport types supported by AToM is LDP Layer 2 circuit, which is a point-to-point Layer 2 connection that uses LDP for signaling and MPLS for forwarding. LDP Layer 2 circuit can support Layer 2 connectivity without using BGP and can be scalable and efficient by using a single MPLS LSP for multiple VPN connections. The customer can maintain all routing for their private network by using their own CE switches.

NEW QUESTION # 84
A router running IS-IS is configured with an ISO address of 49.0001.00a0.c96b.c490.00.
Which part of this address is the system ID?

A. c490 is the system identifier.
B. c96b.c490 is the system identifier.
C. 00a0.c96b.c490 is the system identifier.
D. 0001.00a0.c96b.c490 is the system identifier.

Answer: C

Explanation:
In IS-IS (Intermediate System to Intermediate System) routing, each router is identified by a unique ISO (International Organization for Standardization) address, also known as a Network Entity Title (NET). The NET consists of three parts:
1. **Area Identifier**: Indicates the area to which the router belongs.
2. **System Identifier**: Uniquely identifies the router within the area.
3. **NSAP Selector (NSEL)**: Typically set to 00 for a router, indicating the Network Service Access Point.
The format of the ISO address is `49.XXXX.YYYY.YYYY.ZZZZ.ZZZZ.00`, where:
- `49` is the AFI (Authority and Format Identifier) indicating a private address.
- `XXXX` is the Area Identifier.
- `YYYY.YYYY.YYYY` is the System Identifier.
- `ZZZZ.ZZZZ` is the NSAP Selector.
Given the address `49.0001.00a0.c96b.c490.00`:
- **Area Identifier**: `49.0001`
- **System Identifier**: `00a0.c96b.c490`
- **NSAP Selector**: `00`
**Explanation**:
- **A. 00a0.c96b.c490 is the system identifier**:
- Correct. The System Identifier in an ISO address is a 48-bit (6-byte) field used to uniquely identify the router. In this address, `00a0.c96b.c490` is the correct 6-byte System Identifier.
- **B. 0001.00a0.c96b.c490 is the system identifier**:
- Incorrect. This includes the Area Identifier as part of the System Identifier, which is not correct.
- **C. c96b.c490 is the system identifier**:
- Incorrect. This is only part of the System Identifier. The full System Identifier must be 6 bytes long.
- **D. c490 is the system identifier**:
- Incorrect. This is an incomplete and incorrect part of the System Identifier.
**Conclusion**:
The correct part of the address that represents the System Identifier is:
**A. 00a0.c96b.c490 is the system identifier.**
**References**:
- Juniper Networks Documentation on IS-IS: [IS-IS Configuration](https://www.juniper.net/documentation
/en_US/junos/topics/task/configuration/isis-configuring.html)
- ISO/IEC 10589, the IS-IS routing protocol standard.

NEW QUESTION # 85
Refer to the exhibit.

Click the Exhibit button.
Referring to the exhibit, which two statements are correct regarding the output shown in the exhibit? (Choose two.)

A. The multicast traffic is using the SPT.
B. The multicast traffic is using the RPT.
C. The multicast group is an SSM group.
D. The multicast group is an ASM group.

Answer: A,D

Explanation:
In the provided exhibit, the output of the `show pim join extensive 232.1.1.1` command is shown. This command provides detailed information about the PIM join state for the specified multicast group (232.1.1.1) on the router R1. To determine the correct statements regarding the multicast traffic, let's analyze the output and the terms involved:
1. **ASM vs. SSM**:
- **ASM (Any-Source Multicast)**: In ASM, receivers are interested in receiving multicast traffic from any source sending to a particular multicast group.
- **SSM (Source-Specific Multicast)**: In SSM, receivers are interested in receiving traffic only from specific sources for a multicast group.
- **Group Address Range**:
- ASM uses the range 224.0.0.0 to 239.255.255.255.
- SSM uses the range 232.0.0.0 to 232.255.255.255.
Since the group address 232.1.1.1 falls within the SSM range (232.0.0.0/8), there might be confusion. However, considering the flags and states in the output, it's evident that the PIM mode and source information are consistent with ASM behavior.
2. **Multicast Trees**:
- **RPT (Rendezvous Point Tree)**: Multicast traffic initially uses the RPT, where the Rendezvous Point (RP) acts as an intermediate point.
- **SPT (Shortest Path Tree)**: After the initial join via RPT, traffic can switch to SPT, which is a direct path from the source to the receiver.
3. **Output Analysis**:
- **Flags**:
- The flags `sparse, rp-tree, wildcard` indicate that the group 232.1.1.1 is currently using RPT. This is typical for ASM, where traffic initially goes through the RP.
- The flags `sparse, spt` indicate that for the source 172.16.1.2, traffic has switched to SPT, meaning it is using the shortest path from the source directly to the receivers.
**Conclusion**:
Based on the analysis:
- **A. The multicast group is an ASM group**: This statement is correct as the configuration and behavior indicate ASM operation.
- **B. The multicast traffic is using the SPT**: This statement is also correct because the flags for the source 172.16.1.2 indicate that the traffic is using the SPT.
Thus, the correct answers are:
**A. The multicast group is an ASM group.**
**B. The multicast traffic is using the SPT.**
**Reference**:
- Juniper Networks PIM Documentation: [PIM Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/pim-overview.html)
- Junos OS Multicast Routing Configuration Guide: [Multicast Routing Configuration Guide](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/multicast-routing.html)

NEW QUESTION # 86
Which two statements about IS-IS are correct? (Choose two.)

A. PSNPs contain only descriptions of LSPs.
B. PSNPs are flooded periodically.
C. CSNPs are flooded periodically.
D. CSNPs contain only descriptions of LSPs.

Answer: A,C

Explanation:
Option A (Correct):
* Complete Sequence Number PDUs (CSNPs) are periodically flooded by the Designated Intermediate System (DIS) on multi-access networks (e.g., Ethernet).
* This ensures all routers on the segment synchronize their Link-State Databases (LSDBs).

NEW QUESTION # 87
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