ANS-C01 Network Implementation Practice Question
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?
⚠ Common exam trap
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.
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
(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.
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.
- ✓
10.0.3.0/24
Why this is correct
Within VPC CIDR.
- ✓
10.0.5.0/24
Why this is correct
Within VPC CIDR.
- ✗
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.
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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.