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Exam ANS-C00 topic 1 question 365 discussion

Exam question from Amazon's ANS-C00
Question #: 365
Topic #: 1
[All ANS-C00 Questions]

A company is running services in a VPC with a CIDR block of 10.5.0.0/22. End users report that they no longer can provision new resources because some of the subnets in the VPC have run out of IP addresses.
How should a network engineer resolve this issue?

  • A. Add 10.5.2.0/23 as a second CIDR block to the VPC. Create a new subnet with a new CIDR block, and provision new resources in the new subnet.
  • B. Add 10.5.4.0/21 as a second CIDR block to the VPC. Assign a second network from this CIDR block to the existing subnets that have run out of IP addresses.
  • C. Add 10.5.4.0/22 as a second CIDR block to the VPC. Assign a second network from this CIDR block to the existing subnets that have run out of IP addresses.
  • D. Add 10.5.4.0/22 as a second CIDR block to the VPC. Create a new subnet with a new CIDR block, and provision new resources in the new subnet.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by walkwolf3 at Sept. 1, 2021, 11:37 p.m.
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walkwolf3
Highly Voted 3 years, 8 months ago
D 10.5.4.0/22 is the next available subnet, besides you can't assign a new subnet to an existing subent, add a new subnet is the correct option.
upvoted 6 times
ciao
3 years, 4 months ago
shouldn't the next available subnet be 10.5.2.0/22?
upvoted 1 times
kopper2019
3 years, 3 months ago
no, just use an network calculator in web, or keep it my mind /22 = +4
upvoted 1 times
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ExtHo
3 years, 4 months ago
CIDR 10.5.0.0/22 First Host IP 10.5.0.1 Last Host IP 10.5.3.254 so next should be 10.5.4.0/22
upvoted 3 times
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NariNaray
Most Recent 2 years, 5 months ago
Answer C: secondary cidr to existing cidr (which ran out of space). see following You can associate secondary IPv4 CIDR blocks with your VPC. source:https://docs.aws.amazon.com/vpc/latest/userguide/configure-your-vpc.html
upvoted 1 times
Balki
2 years, 5 months ago
See the answer fully. We cannot add new CIDR block to existing subnets. We can add it to existing VPC as a NEW Subnet
upvoted 1 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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