ExamGecko
Search Search Login
Home Home / Juniper / JN0-664
Question list
Search
Search

List of questions

Search
Open VPLUS File
Convert VPLUS to PDF

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 89 - JN0-664 discussion

Report
Export

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.
ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.
Answers
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.
Answers
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.
Answers
C.
P routers only maintain the internal routes from their own AS.
D.
P routers maintain the internal routes from its own AS and the loopback address from the other AS PEs.
Answers
D.
P routers maintain the internal routes from its own AS and the loopback address 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.
Answers
E.
ASBR routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.
Suggested answer: A, B, C

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

Show Answer
asked 18/09/2024
Michael Sheard
45 questions
PreviousPreviousNextNext
User
Your answer:
0 comments
Sorted by

Leave a comment first

ExamGecko

Copyright @2023 ExamGecko | All right reserved

Mail us: [email protected]
About us
Contact us
Twitter X
Facebook
Medium
Convert VPLUS to PDF
Open VPLUS files Easily and Quickly
Privacy Policy
Disclaimer
Terms