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The JN0-664 certification exam is a professional level exam, which means that it is intended for individuals who have a significant amount of experience in the service provider industry. JN0-664 exam consists of 65 multiple-choice questions, and individuals are allotted 120 minutes to complete the exam. The passing score for the JN0-664 exam is 65%, and individuals who pass the exam will receive the JNCIP-SP certification.

The JN0-664 exam is a highly valued certification for any network professional who wishes to specialize in service provider networks. Service Provider, Professional (JNCIP-SP) certification provides professionals with the necessary knowledge and skills to configure, manage, and troubleshoot complex service provider networks. It also helps professionals to demonstrate their expertise in Junos OS and related platforms. Passing the JN0-664 Exam is a significant achievement and can open up several career opportunities in the service provider industry.

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Juniper JN0-664 Certification Exam consists of 65 multiple-choice questions that must be completed within 120 minutes. JN0-664 exam is available in several languages, including English, Japanese, and Chinese. To prepare for the exam, candidates can take advantage of a variety of resources, including Juniper Networks training courses, study guides, and practice tests.

Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q48-Q53):

NEW QUESTION # 48
You are asked to protect your company's customers from amplification attacks. In this scenario, what is Juniper's recommended protection method?

A. ASN prepending
B. BGP FlowSpec
C. destination-based Remote Triggered Black Hole
D. unicast Reverse Path Forwarding

Answer: B

NEW QUESTION # 49
Referring to the exhibit, which statement is correct?

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

Answer: D

NEW QUESTION # 50
Exhibit

Click the Exhibit button-Referring to the exhibit, which two statements are correct about BGP routes on R3 that are learned from the ISP-A neighbor? (Choose two.)

A. The BGP local-preference value that is used by ISP-A is not advertised to R3.
B. The next-hop value for these routes is changed by ISP-A before being sent to R3.
C. All BGP attribute values must be removed before receiving the routes.
D. By default, the next-hop value for these routes is not changed by ISP-A before being sent to R3.

Answer: A,D

Explanation:
BGP is an exterior gateway protocol that uses path vector routing to exchange routing information among autonomous systems. BGP uses various attributes to select the best path to each destination and to propagate routing policies. Some of the common BGP attributes are AS path, next hop, local preference, MED, origin, weight, and community. BGP attributes can be classified into four categories: well-known mandatory, well-known discretionary, optional transitive, and optional nontransitive. Well-known mandatory attributes are attributes that must be present in every BGP update message and must be recognized by every BGP speaker.
Well-known discretionary attributes are attributes that may or may not be present in a BGP update message but must be recognized by every BGP speaker. Optional transitive attributes are attributes that may or may not be present in a BGP update message and may or may not be recognized by a BGP speaker. If an optional transitive attribute is not recognized by a BGP speaker, it is passed along to the next BGP speaker. Optional nontransitive attributes are attributes that may or may not be present in a BGP update message and may or may not be recognized by a BGP speaker. If an optional nontransitive attribute is not recognized by a BGP speaker, it is not passed along to the next BGP speaker. In this question, we have four routers (R1, R2, R3, and R4) that are connected in a full mesh topology and running IBGP. R3 receives the 192.168.0.0/16 route from its EBGP neighbor and advertises it to R1 and R4 with different BGP attribute values. We are asked which statements are correct about the BGP routes on R3 that are learned from the ISP-A neighbor. Based on the information given, we can infer that the correct statements are:
By default, the next-hop value for these routes is not changed by ISP-A before being sent to R3. This is because the default behavior of EBGP is to preserve the next-hop attribute of the routes received from another EBGP neighbor. The next-hop attribute indicates the IP address of the router that should be used as the next hop to reach the destination network.
The BGP local-preference value that is used by ISP-A is not advertised to R3. This is because the local-preference attribute is a well-known discretionary attribute that is used to influence the outbound traffic from an autonomous system. The local-preference attribute is only propagated within an autonomous system and is not advertised to external neighbors.
References: : https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html :
https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html :
https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13759-37.html

NEW QUESTION # 51
Which two statements about IS-IS are correct? (Choose two.)

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

Answer: A,B

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.**
**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 and use of IS-IS, including the roles of PSNPs and CSNPs.

NEW QUESTION # 52
Exhibit

You are troubleshooting the connection between AS 64496 and AS 64497 and notice that only one of the paths is being used for traffic forwarding.
Referring to the exhibit, which three actions will ensure that R1 is configured properly for load balancing BGP routes? (Choose three.)

A. Verify that the multipath option is configured under protocols bgp on both R2 and R3.
B. Verify that the multipath option is configured under protocols bgp on R1.
C. Verify that there is a load balancing export policy under routing-options for the received BGP routes on R1.
D. Verify that the routing table on R1 has BGP routes for 203.0.113.128/25 with multiple next hops.
E. Verify that an import load balancing policy exists under protocols bgp for the received BGP routes on R1.

Answer: B,C,D

Explanation:
https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/topic-map/load-balancing-bgp-session.html

NEW QUESTION # 53
......

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