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Huawei H12-891_V1.0 Exam - Topic 3 Question 73 Discussion

Actual exam question for Huawei's H12-891_V1.0 exam
Question #: 73
Topic #: 3
[All H12-891_V1.0 Questions]

In MPLSVPN, in order to distinguish between IPv4 prefixes that use the same address space, the RD value is added to the IPv4 address, and the following options are described correctly as ?

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Suggested Answer: B

by Floyd at Nov 19, 2025, 11:14 PM

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Cora
8 hours ago
D) Wait, does the PE really add RD to the route? Sounds complicated!
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Jeanice
6 days ago
C) Yep, RD as an extended community in BGP makes sense.
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Willard
11 days ago
B) is correct, uniqueness is key for PE devices!
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Rodrigo
16 days ago
Hmm, I wonder if the exam will also ask about the difference between RD and RT. That's a tricky one!
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Phil
21 days ago
A) is not quite right. The RD is used to distinguish between IPv4 prefixes, not to control VPN routing information publication.
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Tijuana
26 days ago
B) is correct too. Each VPN instance on a PE device has a unique RD value.
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Wilson
1 month ago
C) is also correct. The RD is encapsulated in the BGP Update message as an extended community attribute.
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Ashleigh
1 month ago
D) is the correct answer. The RD is added to the IPv4 prefix to create a globally unique VPN-IPv4 route.
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Bambi
1 month ago
For the last option, I believe the PE adds the RD to the route, but I'm not clear on how it translates to a globally unique VPN-IPv4 route.
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Ozell
2 months ago
I practiced a question similar to this, and I recall that the RD is indeed encapsulated in the BGP Update message as an extended community attribute.
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Kristofer
2 months ago
Hmm, I'm not sure about the details of how the RD is used in the Update message. I'll need to double-check the BGP extended community attributes to make sure I understand that part correctly.
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Ciara
2 months ago
The key here is that the RD value is unique per VPN instance on the PE device. This allows the PE to differentiate between IPv4 prefixes that might overlap between different VPNs. I'm pretty confident I can identify the correct answer based on this understanding.
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Rashida
2 months ago
A) is spot on, RD really helps with routing control.
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Karma
2 months ago
I think each VPN instance does need a unique RD on the same PE device, but I might be mixing it up with other attributes.
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Pamela
2 months ago
I remember that the RD is crucial for distinguishing routes, but I'm not entirely sure if it controls the publication of routing info.
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Glory
3 months ago
I feel option A is important for controlling routing info.
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Laura
3 months ago
Okay, I think I've got this. The RD value is used to make the IPv4 prefix globally unique when it's advertised in the MPLS VPN network. The PE device adds the RD to the IPv4 prefix to create a VPN-IPv4 route that can be shared across the public network.
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Makeda
3 months ago
I'm a bit confused about the RD value and how it's used to distinguish between IPv4 prefixes. I'll need to review the MPLS VPN concepts again to make sure I understand this properly.
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Izetta
3 months ago
Exactly! It ensures the routes are globally unique.
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