This ANS-C01 practice question tests your understanding of network design. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 and needs to connect to another VPC with CIDR 10.0.0.0/16 via VPC Peering. They encounter an error because of overlapping CIDRs. Which TWO actions can resolve this issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a new VPC with a non-overlapping CIDR and peer with that
Option B is correct because creating a new VPC with a non-overlapping CIDR and establishing a VPC peering connection resolves the conflict. VPC peering requires that the CIDR blocks of the two VPCs do not overlap, as overlapping ranges prevent proper route table entries and cause routing ambiguity. By using a non-overlapping CIDR, you enable direct connectivity between the VPCs without IP address conflicts.
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.
✗
Use a subnet-level peering connection
Why it's wrong here
VPC Peering is at VPC level, not subnet.
✓
Create a new VPC with a non-overlapping CIDR and peer with that
Why this is correct
New VPC can be peered.
Related concept
Read the scenario before looking for a memorised answer.
✗
Modify the CIDR of one VPC to a non-overlapping range
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think they can modify a VPC's CIDR after creation or use subnet-level peering, but AWS does not support either, and they may overlook Transit Gateway as a valid solution for overlapping CIDRs.
Detailed technical explanation
How to think about this question
VPC peering relies on route table entries that must have unique destination CIDRs to avoid ambiguity; overlapping CIDRs cause the VPC router to be unable to determine which VPC to forward traffic to, leading to dropped packets. AWS Transit Gateway (Option D) can handle overlapping CIDRs by using separate route tables per attachment, allowing traffic to be isolated and routed correctly without IP conflicts. In real-world scenarios, overlapping CIDRs often occur during mergers or acquisitions, and Transit Gateway is the preferred solution when renumbering VPCs is not feasible.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a new VPC with a non-overlapping CIDR and peer with that — Option B is correct because creating a new VPC with a non-overlapping CIDR and establishing a VPC peering connection resolves the conflict. VPC peering requires that the CIDR blocks of the two VPCs do not overlap, as overlapping ranges prevent proper route table entries and cause routing ambiguity. By using a non-overlapping CIDR, you enable direct connectivity between the VPCs without IP address conflicts.
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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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.
Question Discussion
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