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Exam ANS-C00 topic 1 question 200 discussion

Exam question from Amazon's ANS-C00
Question #: 200
Topic #: 1
[All ANS-C00 Questions]

If you have one VPC peered with two VPCs with overlapping CIDRs, which route will be more preferred?

  • A. 10.1.0.0/16
  • B. 10.0.0.0/8
  • C. 10.1.1.5/32
  • D. 10.1.1.0/24
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Suggested Answer: C 🗳️
10.1.1.5/32. The most specific route is preferred.

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ChauPhan
Highly Voted 3 years, 7 months ago
C. 10.1.1.5/32, most specific
upvoted 12 times
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MohamedSherif1
Most Recent 3 years ago
C. 10.1.1.5/32
upvoted 1 times
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Royce341
3 years, 2 months ago
Bad question with not enough info.. It depends which route is local to the VPC in question where the routes are being selected. Local route is always preferred. On top of that, you cannot create a /32 route inside a VPC - it must be an externally route learned from outside the VPC (in which case it can't be local). Then again on top of that - you cannot VPC peer with overlapping networks to begin with.
upvoted 2 times
AleZ67
3 years, 2 months ago
Question is about VPC A peering both with VPC B and VPC C where B and C overlaps. That's possible. It's also possible to add a /32 route with a peering as target. So, it's C.
upvoted 2 times
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bp339
3 years, 2 months ago
You cannot create a VPC peering connection between VPCs with matching or overlapping IPv4 CIDR blocks. https://docs.aws.amazon.com/vpc/latest/peering/invalid-peering-configurations.html
upvoted 2 times
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BB_norway
3 years, 4 months ago
But we can't have peering with two VPCs with overlapping CIDRs, right?
upvoted 1 times
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AzureDP900
3 years, 4 months ago
C is more specific.
upvoted 1 times
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AzureDP900
3 years, 4 months ago
C is correct answer
upvoted 1 times
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hugo1111
3 years, 5 months ago
I understand if the question is asking which route will be used... but I dont understand why vpc peering can have cidr overlapping...it makes me confusing.. https://docs.aws.amazon.com/vpc/latest/peering/invalid-peering-configurations.html
upvoted 3 times
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eeghai7thioyaiR4
3 years, 7 months ago
Ans: C ? I dunno, the more specific
upvoted 1 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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