AWS Certified Advanced Networking – Specialty (ANS-C00) — Question 263

What is the IPv6 subnet CIDR used by a VPC?

Answer options

• A. /128
• B. /56
• C. /48
• D. /16

Correct answer: B

Explanation

The correct answer is /56, as it is the standard subnet size for IPv6 allocations in a VPC, allowing for a sufficient number of subnets. Options /128 and /48 are either too specific for a single device or too large for typical VPC use, while /16 is more common for IPv4 addresses.