ANS-C01 Network Implementation Practice Question
A company is setting up AWS Client VPN to allow remote employees to access resources in a VPC. The VPC has a CIDR block of 10.0.0.0/16. The Client VPN endpoint is associated with a subnet 10.0.1.0/24. The company wants to assign client IP addresses from a different CIDR range than the VPC to avoid overlap. Which client CIDR range should the company specify?
⚠ Common exam trap
Candidates may mistakenly assume only one specific private range is allowed, but any non-overlapping RFC 1918 range works. The trap is focusing on size rather than the overlap condition.
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
✓
172.16.0.0/12
The client CIDR range must not overlap with the VPC CIDR (10.0.0.0/16) or any on-premises networks. Both 172.16.0.0/12 (A) and 192.168.0.0/16 (D) are private RFC 1918 ranges that do not overlap, making them valid choices. Options B and C overlap with the VPC CIDR and are invalid. Note: This question accepts multiple correct answers (multi-select).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
172.16.0.0/12
Why this is correct
172.16.0.0/12 is a private RFC 1918 range that does not overlap with the VPC CIDR (10.0.0.0/16). It is a valid client CIDR range.
- ✗
10.0.0.0/16
Why it's wrong here
10.0.0.0/16 overlaps with the VPC CIDR (10.0.0.0/16), causing routing conflicts. Invalid.
- ✗
10.0.0.0/8
Why it's wrong here
10.0.0.0/8 overlaps with the VPC CIDR (which is within 10.0.0.0/8), causing routing conflicts. Invalid.
- ✓
192.168.0.0/16
Why this is correct
192.168.0.0/16 is a private RFC 1918 range that does not overlap with the VPC CIDR (10.0.0.0/16). It is a valid client CIDR range.
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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.