ANS-C01 Network Implementation Practice Question
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?
⚠ Common exam trap
Test-takers frequently 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.
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.
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.
- ✗
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
AWS Transit Gateway is tempting because it provides a highly scalable hub-and-spoke model for connecting numerous VPCs. However, for multiple VPCs solely within the same AWS account and Region, Transit Gateway introduces an additional network hop and management overhead compared to direct VPC Peering connections, which establish a direct network path. Transit Gateway would be the correct choice when connecting a large number of VPCs, especially across different accounts or Regions, to simplify routing and network management at scale.
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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.