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Juniper JN0-664 Exam - Topic 7 Question 39 Discussion

You are configuring a Layer 3 VPN between two sites. You are configuring the vrf-target target : 65100:100 statement in your routing instance.In this scenario, which two statements describe the vrf-target configuration? (Choose two.)
B) This value is used to identify BGP routes learned from the remote PE device. and D) This value is used to add a target community to BGP routes advertised to the remote PE device.
A) This value is used to identify BGP routes learned from the local CE device.
C) This value is used to add a target community to BGP routes advertised to the local CE device.

Juniper JN0-664 Exam - Topic 7 Question 39 Discussion

Actual exam question for Juniper's JN0-664 exam
Question #: 39
Topic #: 7
[All JN0-664 Questions]

You are configuring a Layer 3 VPN between two sites. You are configuring the vrf-target target : 65100:100 statement in your routing instance.

In this scenario, which two statements describe the vrf-target configuration? (Choose two.)

Show Suggested Answer Hide Answer
Suggested Answer: B, D

The `vrf-target` statement in a Layer 3 VPN configuration is used to control the import and export of VPN routes by attaching a target community to the routes. This helps in defining which VPN routes should be imported into or exported from a particular VRF (Virtual Routing and Forwarding) instance.

1. **Understanding VRF Target**:

- The `vrf-target` statement specifies the extended community attributes (route targets) that are used to control the import and export of routes in a VRF.

- These attributes help in identifying which routes should be shared between different VRFs, particularly across different PE (Provider Edge) devices.

2. **Statements Analysis**:

- **A. This value is used to identify BGP routes learned from the local CE device.**

- Incorrect. The `vrf-target` attribute is not used to identify routes learned from the local CE device. It is used to manage routes between PE devices and within the provider's MPLS network.

- **B. This value is used to identify BGP routes learned from the remote PE device.**

- Correct. The `vrf-target` value helps in identifying which routes from remote PE devices should be imported into the local VRF. It essentially acts as a filter for importing BGP routes with matching target communities.

- **C. This value is used to add a target community to BGP routes advertised to the local CE device.**

- Incorrect. Routes advertised to the local CE device do not use the `vrf-target` attribute. Instead, these routes are typically managed within the local VRF routing table.

- **D. This value is used to add a target community to BGP routes advertised to the remote PE device.**

- Correct. When advertising routes from the local PE to remote PE devices, the `vrf-target` value is added to these routes. This target community ensures that the correct routes are shared across the VPN.

**Conclusion**:

The correct statements about the `vrf-target` configuration in a Layer 3 VPN scenario are:

**B. This value is used to identify BGP routes learned from the remote PE device.**

**D. This value is used to add a target community to BGP routes advertised to the remote PE device.**

**Reference**:

- Juniper Networks Documentation on VRF Target: [VRF Target Configuration](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/layer-3-vpns.html)

- MPLS and VPN Architectures by Ivan Pepelnjak and Jim Guichard


by Shawnda at Oct 24, 2024, 07:08 PM

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Aimee
9 months ago
Totally agree, it's all about the remote PE device!
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Audria
9 months ago
Wait, I thought vrf-target was only for local routes?
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Glenn
9 months ago
The target community is crucial for route advertisement!
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Eric
10 months ago
I think it's more about the local CE device, right?
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Viola
10 months ago
It's definitely for identifying routes from the remote PE device.
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Sharika
10 months ago
I’m leaning towards option D because it seems logical that the vrf-target would be used for routes going to the remote PE device.
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Nana
10 months ago
I feel like option C sounds familiar, but I can't recall if it's specifically for the local CE or something else.
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Juliann
10 months ago
I remember practicing a similar question where the vrf-target was used to manage route advertisements. I think it might be about the remote PE device.
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Amber
11 months ago
I think the vrf-target is related to how routes are identified, but I'm not sure if it's for local or remote devices.
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Leonida
11 months ago
Okay, I think I've got it. The VRF target is used to identify the BGP routes learned from the remote PE device, and to add a target community to the routes advertised to the local CE device. I'll mark those two options.
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Izetta
11 months ago
I'm a bit confused on this one. The VRF target seems to be involved in identifying routes, but I'm not sure if it's for the local CE or the remote PE. I'll need to re-read the question carefully.
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Darnell
11 months ago
I've seen this type of question before. The VRF target is used to add a community to the BGP routes, right? I think the key is understanding how that community is used on the remote PE device.
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Lenna
11 months ago
Okay, let's see. The VRF target is used to identify BGP routes, so I'm guessing it's related to the route exchange between the CE and PE devices. I'll need to review my notes on that.
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Vashti
11 months ago
Hmm, this looks like a tricky one. I'll need to think carefully about the VRF target configuration and how it's used in a Layer 3 VPN setup.
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Paz
2 years ago
I agree with the first candidate. The vrf-target is all about route distribution between the local and remote sites in a Layer 3 VPN setup.
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Mirta
2 years ago
This is such a straightforward question. I bet the exam writers are trying to trip us up with these seemingly easy questions. Better double-check the options just in case!
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Annice
2 years ago
Hmm, this question is a piece of cake! Obviously, the vrf-target is used for route identification and route tagging. Gotta love these networking fundamentals.
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Dorsey
2 years ago
B) This value is used to identify BGP routes learned from the remote PE device.
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Brock
2 years ago
A) This value is used to identify BGP routes learned from the local CE device.
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Tegan
2 years ago
B) This value is used to identify BGP routes learned from the remote PE device.
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Malcom
2 years ago
A) This value is used to identify BGP routes learned from the local CE device.
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Milly
2 years ago
Option B and D are correct. The vrf-target value is used to identify routes learned from the remote PE and add a target community to routes advertised to the remote PE.
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Malinda
2 years ago
D) This value is used to add a target community to BGP routes advertised to the remote PE device.
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Tamar
2 years ago
B) This value is used to identify BGP routes learned from the remote PE device.
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Myra
2 years ago
I believe the vrf-target is also used to add a target community to BGP routes advertised to the remote PE device.
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Devorah
2 years ago
I think the vrf-target is used to identify BGP routes learned from the local CE device.
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