- A
VPC peering connections
Simple, direct, scalable for multiple VPCs.
- B
AWS Site-to-Site VPN
Why wrong: VPN is for on-premises to AWS, not VPC-to-VPC.
- C
ClassicLink
Why wrong: ClassicLink is for linking EC2-Classic to VPC, not VPC-to-VPC.
- D
AWS Transit Gateway
Why wrong: Transit Gateway is more complex and costly; overkill for simple VPC peering.
Question 1,635 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 multiple VPCs that need to communicate with each other using private IP addresses. The VPCs are in the same AWS account and Region. Which AWS service provides the simplest and most scalable solution?
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
✓
VPC peering connections
VPC peering connections allow direct, private IP connectivity between VPCs using the AWS global network, with no single point of failure or bandwidth bottleneck. It is the simplest solution because it requires no additional hardware or software, and it scales horizontally by adding more peering connections as needed, though it does not support transitive routing.
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.
- ✓
VPC peering connections
Why this is correct
Simple, direct, scalable for multiple VPCs.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Site-to-Site VPN
Why it's wrong here
VPN is for on-premises to AWS, not VPC-to-VPC.
- ✗
ClassicLink
Why it's wrong here
ClassicLink is for linking EC2-Classic to VPC, not VPC-to-VPC.
- ✗
AWS Transit Gateway
Why it's wrong here
Transit Gateway is more complex and costly; overkill for simple VPC peering.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose AWS Transit Gateway (Option D) because it is a powerful hub-and-spoke solution, but the question asks for the 'simplest and most scalable' solution for multiple VPCs in the same account and Region, and VPC peering is simpler for small numbers of VPCs, while Transit Gateway adds unnecessary complexity and cost for this specific scenario.
Detailed technical explanation
How to think about this question
VPC peering uses the AWS backbone infrastructure to route traffic between VPCs without traversing the public internet, and it relies on route table entries and security group rules to control traffic. A subtle behavior is that VPC peering does not support transitive routing—if VPC A is peered with VPC B and VPC B with VPC C, traffic cannot flow from A to C through B; each pair must be directly peered. In a real-world scenario, a company with three VPCs (dev, test, prod) would need three separate peering connections, which is simple to manage, but scaling to dozens of VPCs would make Transit Gateway a better choice.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
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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: VPC peering connections — VPC peering connections allow direct, private IP connectivity between VPCs using the AWS global network, with no single point of failure or bandwidth bottleneck. It is the simplest solution because it requires no additional hardware or software, and it scales horizontally by adding more peering connections as needed, though it does not support transitive routing.
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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