ANS-C01 Network Design Practice Question
A company has a VPC with an IPv4 CIDR of 10.0.0.0/16. It needs to add an additional non-overlapping CIDR for new workloads. Which CIDR should be used?
⚠ Common exam trap
Candidates often assume any non-overlapping private IP range is acceptable, but they overlook that the new CIDR must also be from the same RFC 1918 address space and not conflict with any existing subnets, not just the VPC CIDR itself.
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
✓
10.1.0.0/16
(10.1.0.0/16) is correct because it provides a non-overlapping CIDR block that does not conflict with the existing VPC CIDR of 10.0.0.0/16. In AWS, when adding a secondary CIDR to a VPC, the new block must not overlap with the existing VPC CIDR or any of its subnets. The 10.1.0.0/16 range is entirely separate from 10.0.0.0/16, satisfying this requirement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
10.0.0.0/24
Why it's wrong here
This is a subset of the existing CIDR.
- ✓
10.1.0.0/16
Why this is correct
This CIDR is outside the existing 10.0.0.0/16 range.
- ✗
10.0.1.0/24
Why it's wrong here
This is also a subset of the existing CIDR.
- ✗
10.0.0.0/8
Why it's wrong here
This includes the existing CIDR, causing overlap.
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JA
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.