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Question 1

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Exhibit Referring to the exhibit, a working L3VPN exists that connects VPN-A sites CoS is configured correctly to match on the MPLS EXP bits of the LSP, but when traffic is sent from Site-1 to Si

Question 2

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Exhibit You want to implement the BGP Generalized TTL Security Mechanism (GTSM) on the network Which three statements are correct in this scenario? (Choose three)

Question 3

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Which two statements are correct about a sham link? (Choose two.)

Question 4

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Exhibit R1 and R8 are not receiving each other's routes Referring to the exhibit, what are three configuration commands that would solve this problem? (Choose three.)

Question 5

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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

Question 6

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After a recent power outage, your manager asks you to investigate ways to automatically reduce the impact caused by suboptimal routing in your OSPF and OSPFv3 network after devices reboot. Which th

Question 7

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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 yo

Question 8

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You want to ensure that L1 IS-IS routers have only the most specific routes available from L2 IS-IS routers. Which action accomplishes this task?

Question 9

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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 p

Question 10

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Exhibit A network designer would like to create a summary route as shown in the exhibit, but the configuration is not working. Which three configuration changes will create a summary route? (Cho

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Related questions

Exhibit R1 and R8 are not receiving each other's routes Referring to the exhibit, what are three configuration commands that would solve this problem? (Choose three.)

Exhibit A network designer would like to create a summary route as shown in the exhibit, but the configuration is not working. Which three configuration changes will create a summary route? (Choose three.)

Refer to the exhibit. Click the Exhibit button. Referring to the exhibit, you must provide VRF Internet access over a single connection for VPN-A Site 1, which connects to PE-1. Which two statements are correct in this scenario? (Choose two.)

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?

Exhibit You want to implement the BGP Generalized TTL Security Mechanism (GTSM) on the network Which three statements are correct in this scenario? (Choose three)

Exhibit. Referring to the exhib.t, what must be changed to establish a Level 1 adjacency between routers R1 and R2?

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.)

Exhibit Referring to the exhibit, a working L3VPN exists that connects VPN-A sites CoS is configured correctly to match on the MPLS EXP bits of the LSP, but when traffic is sent from Site-1 to Site-2, PE-2 is not classifying the traffic correctly What should you do to solve the problem?

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?

Your network is receiving the 203.0.113.0/24 network using EBGP from AS 64500 and AS 64501. Both of these advertisements have identical local-preference values, AS-path lengths, and BGP origin codes. You want to influence the way your AS sends traffic to the 203.0.113.0/24 network. In this scenario, which attribute would you consider next when selecting the best path?

Question 92 - JN0-664 discussion

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Which two statements about IS-IS are correct? (Choose two.)

A.

PSNPs are used to acknowledge a received LSP.

B.

CSNPs are used to acknowledge a received LSP.

C.

CSNPs are used to request a missing LSP.

D.

PSNPs are used to request a missing LSP.

Suggested answer: A, 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.**

**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.

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asked 18/09/2024

Cheah Eng Soon

34 questions

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Your answer: A B C D

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