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Juniper Exam JN0-664 Topic 3 Question 45 Discussion

Actual exam question for Juniper's JN0-664 exam
Question #: 45
Topic #: 3
[All JN0-664 Questions]

Click the Exhibit button.

Referring to the exhibit, which statement is correct?

Show Suggested Answer Hide Answer
Suggested Answer: A

The exhibit shows the configuration of a VRF (Virtual Routing and Forwarding) instance on a Juniper PE router. Let's break down the key components:

VRF Configuration (VPN-A)

The instance type is VRF, meaning this is an L3VPN (Layer 3 VPN).

The routing instance contains a static route (10.1.0.0/16 next-hop 10.1.0.1).

The interface ge-0/0/2.0 is assigned to the VRF.

Route Distinguisher (RD): 172.17.20.1:1

VRF-Export Policy: vpn-a-export

VRF-Target: target:65512:1 (This defines which routes will be imported into the VRF).

VRF Export Policy (vpn-a-export)

The vpn-a-export policy adds two BGP communities (route targets) to exported VPN routes:

community add vpn-a-target;

community add vpn-m-target;

accept;

The vpn-a-target community corresponds to target:65512:1.

The vpn-m-target community corresponds to target:65512:2.

Policy-Options (Community Definitions)

community vpn-a-target members target:65512:1;

community vpn-m-target members target:65512:2;

This confirms that routes exported from this VRF will have BOTH target:65512:1 and target:65512:2.

Evaluating the Answer Choices

Option A: 'VPN routes are exported with the target:65512:1 and target:65512:2 route targets.'

The vpn-a-export policy explicitly adds both vpn-a-target (65512:1) and vpn-m-target (65512:2) to exported routes.

This is correct.

Option B: 'You cannot use the vrf-target and vrf-export statements in the same VRF.'

This is incorrect.

Juniper allows the use of both vrf-target and vrf-export in the same VRF:

vrf-target is used for importing routes.

vrf-export defines export policies (which can add additional route targets).

This is incorrect.

Option C: 'VPN routes with the target:65512:1 and target:65512:2 route targets are imported.'

The vrf-target target:65512:1; statement only controls importing routes.

The import policy does not include target:65512:2, so routes tagged with target:65512:2 alone would not be imported into this VRF.

This is incorrect.

Option D: 'VPN routes are exported with only the target:65512:1 route target.'

The export policy (vpn-a-export) clearly adds both 65512:1 and 65512:2.

This is incorrect.

Final Answer:

A. VPN routes are exported with the target:65512:1 and target:65512:2 route targets.

Verification from Juniper Documentation

Juniper MPLS L3VPN Configuration Guide confirms that vrf-target is used for importing, while vrf-export can be used for exporting multiple route targets.

Juniper Routing Policy Documentation states that export policies can add multiple BGP communities (route targets).

RFC 4364 (BGP/MPLS IP VPNs) defines the use of route targets for VPN route control.


Contribute your Thoughts:

Norah
16 days ago
Haha, I bet the exam writer was having a field day coming up with these tricky VRF options. I'm sticking with C, though. Seems the most straightforward answer.
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Ellsworth
23 days ago
I'm not sure, but I think B is incorrect.
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Niesha
25 days ago
Wow, this question is really testing our VRF knowledge! I'm going to go with C, since the exhibit clearly shows the import route targets.
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Veta
25 days ago
I'm leaning towards D, based on the exhibit.
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Leonardo
29 days ago
D seems more logical to me. VPN routes are typically exported with a single route target, not multiple ones.
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Janae
13 days ago
User 3: I'm not sure, but D does seem more logical.
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Paulina
18 days ago
User 2: Yeah, I agree. VPN routes usually have a single route target.
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Matilda
20 days ago
User 1: I think D is the correct answer.
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Melissa
1 months ago
I disagree, I believe it's C.
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Paulina
1 months ago
I think the correct statement is A.
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Stefanie
1 months ago
I think the correct answer is C. The VPN routes with the target:65512:1 and target:65512:2 route targets are imported, as stated in the exhibit.
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Karrie
18 days ago
C) VPN routes with the target:65512:1 and target:65512:2 route targets are imported.
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Christene
1 months ago
A) VPN routes are exported with the target:65512:1 and target:65512:2 route targets.
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