- A
10.0.1.0/24
Within 10.0.0.0/16.
- B
10.0.3.0/24
Within VPC CIDR.
- C
10.0.5.0/24
Within VPC CIDR.
- D
10.1.0.0/24
Why wrong: Outside VPC CIDR.
- E
10.0.0.0/8
Why wrong: Not a subnet; overlaps but not valid as a subnet within /16.
Question 1,576 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 has a VPC with a CIDR of 10.0.0.0/16. They need to create subnets for a three-tier application. Which THREE subnet CIDR blocks are valid within this VPC?
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
✓
10.0.1.0/24
Option A (10.0.1.0/24) is a valid subnet within the VPC CIDR 10.0.0.0/16 because its entire address range (10.0.1.0–10.0.1.255) falls within the VPC's address space. The /24 subnet mask is smaller than the VPC's /16, so it is a proper subset. AWS VPCs allow any RFC 1918 private IP range as long as the subnet CIDR is fully contained within the VPC CIDR.
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.
- ✓
10.0.1.0/24
Why this is correct
Within 10.0.0.0/16.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
10.0.3.0/24
Why this is correct
Within VPC CIDR.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
10.0.5.0/24
Why this is correct
Within VPC CIDR.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
10.1.0.0/24
Why it's wrong here
Outside VPC CIDR.
- ✗
10.0.0.0/8
Why it's wrong here
Not a subnet; overlaps but not valid as a subnet within /16.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that any private IP range can be used as a subnet as long as it starts with 10.x.x.x, but the subnet must be a strict subset of the VPC CIDR, not just any overlapping range.
Detailed technical explanation
How to think about this question
When creating subnets in AWS, the subnet CIDR must be a contiguous block fully contained within the VPC CIDR, and the subnet mask must be between /16 and /28 (inclusive) for a /16 VPC. AWS uses the network address and broadcast address of each subnet, so a /24 subnet like 10.0.1.0/24 reserves 10.0.1.0 as the network identifier and 10.0.1.255 as the broadcast address, leaving 251 usable IPs for resources. This is governed by RFC 1878 for subnetting and AWS's VPC documentation.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Visual reference
What to study next
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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: 10.0.1.0/24 — Option A (10.0.1.0/24) is a valid subnet within the VPC CIDR 10.0.0.0/16 because its entire address range (10.0.1.0–10.0.1.255) falls within the VPC's address space. The /24 subnet mask is smaller than the VPC's /16, so it is a proper subset. AWS VPCs allow any RFC 1918 private IP range as long as the subnet CIDR is fully contained within the VPC CIDR.
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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