ANS-C01 Network Design Practice Question
A company is designing a multi-VPC architecture in the same region. The VPCs need to communicate with each other using private IP addresses. The company must minimize cost and operational overhead. Which solution should the company use?
⚠ Common exam trap
Candidates often choose Transit Gateway (Option D) because it is a modern, centralized solution, but they overlook the specific constraint of minimizing cost and operational overhead for a small number of VPCs, where VPC peering is simpler and cheaper.
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
✓
Create VPC peering connections between each pair of VPCs.
VPC peering connections provide direct, private IP connectivity between VPCs using the AWS global network, with no bandwidth bottlenecks or single points of failure. It is the most cost-effective solution for a small number of VPCs (e.g., fewer than 10) as there are no hourly charges for the peering connection itself—only data transfer costs. This minimizes operational overhead compared to managing VPN tunnels or a Transit Gateway, as peering is a simple, one-to-one relationship that does not require additional appliances or complex routing policies.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set up AWS Site-to-Site VPN connections between each VPC.
Why it's wrong here
VPN is more expensive and complex than peering.
- ✗
Use ClassicLink to connect the VPCs.
Why it's wrong here
ClassicLink is for EC2-Classic, not VPC-to-VPC.
- ✓
Create VPC peering connections between each pair of VPCs.
Why this is correct
VPC peering is simple, low-cost, and uses private IPs.
- ✗
Create a Transit Gateway and attach all VPCs.
Why it's wrong here
Transit Gateway is more expensive and complex than peering for few VPCs.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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