ANS-C01 Network Design Practice Question
A company has a VPC with an IPv4 CIDR of 10.0.0.0/16. It needs to connect to two other VPCs: VPC B (10.1.0.0/16) and VPC C (10.2.0.0/16). The company wants to use AWS Transit Gateway. Which THREE configurations are required to enable full mesh connectivity between all three VPCs?
⚠ Common exam trap
Watch out — candidates often think separate route tables are needed for isolation (Option A) or that VPN attachments are required for security (Option B), but full mesh connectivity simply requires a single Transit Gateway route table with routes pointing to each VPC attachment and all attachments associated with that route table.
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
✓
Associate each VPC attachment with the Transit Gateway route table.
Associating each VPC attachment with the Transit Gateway route table is necessary for the Transit Gateway to know which attachments can communicate. Without this association, the Transit Gateway would not forward traffic between the VPCs, even if routes are present in the route table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create separate Transit Gateway route tables for each VPC to isolate traffic.
Why it's wrong here
Separate route tables would isolate, not enable full mesh.
- ✗
Create a VPN attachment to each VPC for encrypted communication.
Why it's wrong here
VPN attachments are for on-premises, not needed for VPC-to-VPC over Transit Gateway.
- ✓
Associate each VPC attachment with the Transit Gateway route table.
Why this is correct
Association allows the VPC to use the route table.
- ✓
Create a Transit Gateway and attach each VPC to it.
Why this is correct
Attachments allow VPCs to connect to the Transit Gateway.
- ✓
Create a Transit Gateway route table and add static routes for each VPC CIDR pointing to the respective attachment.
Why this is correct
Routes enable traffic between VPCs.
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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.