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To pass the JN0-664 Exam, candidates must demonstrate a deep understanding of service provider routing and be able to configure and troubleshoot complex network scenarios. Successful candidates will earn the Juniper Networks Certified Internet Professional (JNCIP-SP) certification, which is a valuable credential for networking professionals seeking to advance their careers in the service provider industry.

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Upon successfully passing the Juniper JN0-664 Certification Exam, candidates will be awarded the Juniper Networks Certified Internet Professional (JNCIP-SP) certification. Service Provider, Professional (JNCIP-SP) certification is valid for three years, after which candidates must recertify by passing a current version of the JNCIP-SP exam or by completing a relevant Juniper Networks certification.

Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q85-Q90):

NEW QUESTION # 85
Which two statements about IS-IS are correct? (Choose two.)

A. CSNPs are used to acknowledge a received LSP.
B. CSNPs are used to request a missing LSP.
C. PSNPs are used to acknowledge a received LSP.
D. PSNPs are used to request a missing LSP.

Answer: C,D

Explanation:
Intermediate System to Intermediate System (IS-IS) is a link-state routing protocol used to move information efficiently within a computer network. It uses a series of Protocol Data Units (PDUs) to manage the network's topology and ensure consistency across all routers in the network. Specifically, Link State PDUs (LSPs), Complete Sequence Number PDUs (CSNPs), and Partial Sequence Number PDUs (PSNPs) play crucial roles in this process.
1. **PSNPs (Partial Sequence Number PDUs)**:
- **Acknowledge a received LSP**: PSNPs are used to acknowledge the receipt of LSPs. When a router receives an LSP, it sends a PSNP back to the sender to confirm that the LSP has been received.
- **Request a missing LSP**: PSNPs are also used to request missing LSPs. If a router identifies a missing LSP based on sequence numbers, it can send a PSNP to request the specific LSP from its neighbors.
2. **CSNPs (Complete Sequence Number PDUs)**:
- **Summarize LSPs**: CSNPs are used to summarize all the LSPs known to a router. They are typically sent at regular intervals to provide a complete list of LSPs in a database. They are not used to acknowledge or request specific LSPs but provide an overview of all LSPs for database synchronization.
Based on this understanding, let's evaluate the statements:
- **A. PSNPs are used to acknowledge a received LSP.**
- Correct. PSNPs serve the purpose of acknowledging LSPs received from other routers.
- **B. CSNPs are used to acknowledge a received LSP.**
- Incorrect. CSNPs are not used for acknowledging LSPs; they are used to provide a summary of all LSPs.
- **C. CSNPs are used to request a missing LSP.**
- Incorrect. CSNPs are not used to request missing LSPs; this is the role of PSNPs.
- **D. PSNPs are used to request a missing LSP.**
- Correct. PSNPs are used to request specific missing LSPs when a router detects that it is missing information.
**Conclusion**:
The correct statements about IS-IS are:
**A. PSNPs are used to acknowledge a received LSP.**
**D. PSNPs are used to request a missing LSP.**
**References**:
- 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 and use of IS-IS, including the roles of PSNPs and CSNPs.

NEW QUESTION # 86
You are a network architect for a service provider and want to offer Layer 2 services to your customers. You want to use EVPN for Layer 2 services in your existing MPLS network.
Which two statements are correct in this scenario? (Choose two.)

A. VXLAN must be configured on all PE routers.
B. EVPN uses Type 3 routes to join a multicast tree to flood traffic.
C. Segment routing must be configured on all PE routers.
D. EVPN uses Type 2 routes to advertise MAC address and IP address pairs learned using ARP snooping.

Answer: B,D

NEW QUESTION # 87
Exhibit

Referring to the exhibit, which two statements are true? (Choose two.)

A. This route is learned through EBGP
B. The devices advertising this route into EVPN are 10 0 2 12 and 10.0.2.22.
C. The device advertising this route into EVPN is 192.168.101.5.
D. This is an EVPN Type-2 route.

Answer: C,D

Explanation:
This is an EVPN Type-2 route, also called a MAC/IP advertisement route, that is used to advertise host IP and MAC address information to other VTEPs in an EVPN network. The route type field in the EVPN NLRI has a value of 2, indicating a Type-2 route. The device advertising this route into EVPN is 192.168.101.5, which is the IP address of the VTEP that learned the host information from the local CE device. This IP address is carried in the MPLS label field of the route as part of the VXLAN encapsulation.

NEW QUESTION # 88
Exhibit

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

A. The connection has not flapped since it was initiated.
B. There has been a VLAN ID mismatch.
C. The PE router has the capability to pop flow labels
D. The PE is attached to a single local site.

Answer: A,D

Explanation:
The output is from the show l2vpn connections command on a Juniper router. This command is used to verify the status of Layer 2 VPN (L2VPN) pseudowires between Provider Edge (PE) routers.
Breakdown of Key Information:
* Instance: vpn-A
* This is the L2VPN instance being monitored.
* Connection Status (St)
* The connection status is "Up", meaning the pseudowire is operational.
* Local Site: CE1-2 (2)
* The PE router is attached to a single local site (CE1-2).
* Uptime & Connection Flaps
* The output shows the last time the connection was up:
Time last up: Apr 11 14:35:27 2020
* The "# Up trans" value is 1, meaning this connection has been established once and has not flapped since it was initiated.
* VLAN ID Mismatch Check
* The legend includes "VM - VLAN ID mismatch", but this status is not present in the connection output.
* This means there is NO VLAN ID mismatch.
* Flow Labels
* The Flow Label Transmit is No, and the Flow Label Receive is No.
* This means the PE router does NOT have the capability to pop flow labels.

NEW QUESTION # 89
Exhibit

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 protocols bgp family inet unicast add-path command to allow additional routes to the RIB tables. -
B. Replace exact in the export policy with orlonger.
C. Add the set routing-options static route 203.0.113.123/25 discard command.
D. Remove the from protocol bgp command from the export policy.

Answer: B,C

Explanation:
To summarize routes from the 203.0.113.128/25 IP block on R8 to AS 64500, you need to do the following:
* Add the set routing-options static route 203.0.113.128/25 discard command. This creates a static route for the summary prefix and discards any traffic destined to it. This is necessary because BGP can only advertise routes that are present in the routing table.
* Replace exact in the export policy with orlonger. This allows R8 to match and advertise any route that is equal or more specific than the summary prefix. The exact term only matches routes that are exactly equal to the summary prefix, which is not present in the routing table.

NEW QUESTION # 90
......

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