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Exam AWS Certified Advanced Networking - Specialty ANS-C01 All Questions

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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 116 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 116
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A network engineer is designing hybrid connectivity with AWS Direct Connect and AWS Transit Gateway. A transit gateway is attached to a Direct Connect gateway and 19 VPCs across different AWS accounts. Two new VPCs are being attached to the transit gateway. The IP address administrator has assigned 10.0.32.0/21 to the first VPC and 10.0.40.0/21 to the second VPC. The prefix list has one CIDR block remaining before the prefix list reaches the quota for the maximum number of entries.

What should the network engineer do to advertise the routes from AWS to on premises to meet these requirements?

  • A. Add 10.0.32.0/21 and 10.0.40.0/21 to both AWS managed prefix lists.
  • B. Add 10.0.32.0/21 and 10.0.40.0/21 to the allowed prefix list.
  • C. Add 10.0.32.0/20 to both AWS managed prefix lists.
  • D. Add 10.0.32.0/20 to the allowed prefix list.
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Suggested Answer: D 🗳️
by Balasmaniam at June 9, 2023, 12:31 p.m.
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norimune
Highly Voted 1 year, 4 months ago
Selected Answer: D
Correct Answer: D The VPC route to send to on-premises is sent by entering the allowed prefix value of DXGW. Since only one remaining frame is used for route information, it is necessary to aggregate two routes
upvoted 10 times
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WherecanIstart
Most Recent 8 months, 1 week ago
Selected Answer: D
D is correct as you have to summarize both subnets into one. x.x.32.0/21 x.x.40.0/21 Both routes/subnets have 4 bits in common in the third octet. 0 0 1 0 0 0 0 0 = 32 0 0 1 0 1 0 0 0 = 40 When summarized you will have 20 network bits which gives you a /20.
upvoted 1 times
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Marfee400704
8 months, 3 weeks ago
I think that it's correct answer is D.
upvoted 1 times
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Certified101
1 year, 3 months ago
Selected Answer: D
If only one CIDR block can be added to the prefix list (due to reaching the maximum quota), then it will be impossible to add both 10.0.32.0/21 and 10.0.40.0/21 separately. However, by aggregating the two CIDR blocks into a single CIDR block (10.0.32.0/20), the network engineer can still add the routes for both VPCs to the allowed prefix list. This is because 10.0.32.0/20 covers IP addresses from 10.0.32.0 to 10.0.47.255, which includes the addresses from both 10.0.32.0/21 (10.0.32.0 to 10.0.39.255) and 10.0.40.0/21 (10.0.40.0 to 10.0.47.255).
upvoted 3 times
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Balasmaniam
1 year, 5 months ago
Selected Answer: B
I think its should be answer : B
upvoted 1 times
Balasmaniam
1 year, 5 months ago
back with answer : D..
upvoted 4 times
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