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Exam ANS-C00 topic 1 question 54 discussion

Exam question from Amazon's ANS-C00
Question #: 54
Topic #: 1
[All ANS-C00 Questions]

An organization launched an IPv6-only web portal to support IPv6-native mobile clients. Front-end instances launch in an Amazon VPC associated with an appropriate IPv6 CIDR. The VPC IPv4 CIDR is fully utilized. A single subnet exists in each of two Availability Zones with appropriately configured IPv6 CIDR associations. Auto Scaling is properly configured, and no Elastic Load Balancing is used.
Customers say the service is unavailable during peak load times. The network engineer attempts to launch an instance manually and receives the following message: `There are not enough free addresses in subnet `˜subnet-12345678' to satisfy the requested number of instances.`
What action will resolve the availability problem?

  • A. Create a new subnet using a VPC secondary IPv6 CIDR, and associate an IPv6 CIDR. Include the new subnet in the Auto Scaling group.
  • B. Create a new subnet using a VPC secondary IPv4 CIDR, and associate an IPv6 CIDR. Include the new subnet in the Auto Scaling group.
  • C. Resize the IPv6 CIDR on each of the existing subnets. Modify the Auto Scaling group maximum number of instances.
  • D. Add a secondary IPv4 CIDR to the Amazon VPC. Assign secondary IPv4 address space to each of the existing subnets.
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by ohcan at Dec. 1, 2019, 11:12 a.m.
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ohcan
Highly Voted 3 years, 7 months ago
After studying more carefully, EC2 instances must have IPv4 in addition to IPv6, so is the IPv4 range which has to be extended. As a subnet CDIR cannot be modified we need to create a new one, associate the new IPv4 an the existing IPv6, and add it to the group. I've tested in my aws account.
upvoted 20 times
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2cool2touch
Highly Voted 3 years, 7 months ago
based on what @ohcan tested, answer is B
upvoted 13 times
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Raphaello
Most Recent 1 year, 1 month ago
Selected Answer: D
That's an old question. Not EC2 can be launched in IPv6-only subnets. No need to associate IPv4 anymore. https://aws.amazon.com/blogs/networking-and-content-delivery/introducing-ipv6-only-subnets-and-ec2-instances/ But..supposed we are still back in the days, D is the correct answer cause the scenario says "The VPC IPv4 CIDR is fully utilized."
upvoted 1 times
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clooudy
3 years ago
Selected Answer: B
Answer B
upvoted 1 times
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StelSen
3 years, 6 months ago
Option:B. Instead of googling, I tried to create VPC with IPV6 and tried to create Subnets. And I have to use ipv4 CIDR for sure. Ipv6 can be optional. No option to resize/edit ipv4/6 ranges. So Option-B
upvoted 2 times
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Huntkey
3 years, 6 months ago
You can add a secondary CIDR to the VPC but you can't do it with a subnet. You have to add a new subnet with the new CIDR you added to the VPC. I think B is more proper
upvoted 3 times
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Scunningham99
3 years, 6 months ago
D is the right answer, adding a new subnet is. It possible as you have used all of your ranges hence you need a new cidr. Ipv6is restricted on the number of ipv4 addresses
upvoted 1 times
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Kentik
3 years, 6 months ago
B is correct
upvoted 1 times
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gltr
3 years, 7 months ago
D, as previously pointed out every EC2 will get an IPv4 address and to create new IPv4s in a VPC we can add a new CIDR range to it (since 2017) https://aws.amazon.com/about-aws/whats-new/2017/08/amazon-virtual-private-cloud-vpc-now-allows-customers-to-expand-their-existing-vpcs/
upvoted 4 times
jason2009
3 years, 6 months ago
Not sure if you have even configured VPC subnet. How on earth could you add secondary CIDR to a subnet? I mean, did you even try it?
upvoted 1 times
JohnnyBG
3 years, 5 months ago
#YesICan https://docs.aws.amazon.com/vpc/latest/userguide/VPC_Subnets.html#vpc-resize my pleasure
upvoted 1 times
JohnnyBG
3 years, 5 months ago
ohhh to a subnet ! #NoIcan't
upvoted 1 times
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luckymuki
3 years, 7 months ago
B is the most accurate answer
upvoted 2 times
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BillyC
3 years, 7 months ago
B for me
upvoted 4 times
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Meetra
3 years, 7 months ago
D. cidr cant resized. add ipv4 as all stacks are ipv4+6
upvoted 3 times
Meetra
3 years, 7 months ago
its B . ipv4 needs ipv6 with it for this to work
upvoted 8 times
Smart
3 years, 7 months ago
Also, cannot add secondary IPv4 to existing subnet.
upvoted 1 times
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ohcan
3 years, 8 months ago
I think I got it. CDIRs cannot be resized, right?. Then A is the right one
upvoted 2 times
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ohcan
3 years, 8 months ago
Actually confusing about this Q. As the EC2 instances are IPv6 only and well configure, so nothing to do with IPv4. So B and D are wrong. Now I'm not sure if A or C.
upvoted 1 times
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