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ANS-C01 · Question #73

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…

The correct answer is B. Create a new subnet using a VPC secondary IPv4 CIDR, and associate an IPv6 CIDR. Include. 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.

Submitted by katya_ua· Mar 6, 2026Design Network Solutions for AWS

Question

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-12345677' to satisfy the requested number of instances." What action will resolve the availability problem?

Options

  • ACreate a new subnet using a VPC secondary IPv6 CIDR, and associate an IPv6 CIDR. Include
  • BCreate a new subnet using a VPC secondary IPv4 CIDR, and associate an IPv6 CIDR. Include
  • CResize the IPv6 CIDR on each of the existing subnets. Modify the Auto Scaling group maximum
  • DAdd a secondary IPv4 CIDR to the Amazon VPC. Assign secondary IPv4 address space to each

How the community answered

(43 responses)
  • A
    28% (12)
  • B
    56% (24)
  • C
    12% (5)
  • D
    5% (2)

Explanation

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.

Topics

#VPC secondary IPv4 CIDR#Subnet creation#EC2 instance addressing#IPv6 VPC

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