ANS-C01 Network Implementation Practice Question
A company has a VPC with an IPv4 CIDR block of 10.0.0.0/16. They need to add an IPv6 CIDR block to the VPC. Which action should they take?
⚠ Common exam trap
A common mix-up: candidates assume they can bring their own IPv6 address space (like with IPv4) or manually configure the CIDR, but AWS only supports Amazon-provided IPv6 CIDR blocks for VPCs.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Associate an Amazon-provided IPv6 CIDR block with the VPC.
Amazon VPC supports IPv6 through an Amazon-provided IPv6 CIDR block that is automatically allocated from Amazon's pool of global unicast addresses. You cannot bring your own IPv6 CIDR or manually assign one; the only supported method is to associate an Amazon-provided /56 IPv6 CIDR block with the VPC. This enables dual-stack networking, allowing resources to communicate over both IPv4 and IPv6.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Request an IPv6 CIDR block from your regional internet registry and associate it with the VPC.
Why it's wrong here
AWS does not support BYOIPv6 for VPC; you use Amazon-provided block.
- ✗
Enable IPv6 on the subnets directly without associating a VPC CIDR.
Why it's wrong here
Subnets require a VPC-level IPv6 CIDR.
- ✗
Manually assign a /56 IPv6 CIDR block to the VPC.
Why it's wrong here
AWS assigns the block automatically.
- ✓
Associate an Amazon-provided IPv6 CIDR block with the VPC.
Why this is correct
Amazon provides a /56 block from their pool.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.