- A
172.16.0.0/12
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.
- B
10.0.0.0/16
Why wrong: 10.0.0.0/16 overlaps with the VPC CIDR (10.0.0.0/16), causing routing conflicts. Invalid.
- C
10.0.0.0/8
Why wrong: 10.0.0.0/8 overlaps with the VPC CIDR (which is within 10.0.0.0/8), causing routing conflicts. Invalid.
- D
192.168.0.0/16
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.
Question 1,370 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
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).
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
AWS Client VPN uses a client CIDR range to assign IP addresses to connected clients from a pool that is separate from the VPC's subnet CIDR. This range is used for the client's tunnel interface and must not overlap with the VPC CIDR or any routes in the association's route table. Under the hood, the Client VPN endpoint creates a virtual network interface in the associated subnet and uses the client CIDR to allocate IPs via DHCP, ensuring that traffic from clients is correctly routed without conflicting with VPC resources. In real-world scenarios, choosing a /16 within 192.168.0.0/16 is common because it provides ample address space while avoiding overlap with typical 10.0.0.0/8 or 172.16.0.0/12 corporate networks.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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).
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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.
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