ANS-C01 Network Implementation Practice Question
A company is implementing a network segmentation strategy using AWS Transit Gateway. They have three VPCs: production, development, and shared services. They need to ensure that production and development VPCs can both access shared services, but cannot communicate with each other. Which THREE configurations are required?
⚠ Common exam trap
It's easy for candidates to assume a single transit gateway route table is sufficient for all attachments, overlooking that separate route tables are required to enforce isolation between specific VPCs while allowing shared access.
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 a route table for the shared services VPC that allows routes to both production and development
The shared services VPC needs a transit gateway route table with routes to both the production and development VPC attachments so that return traffic from shared services can reach those VPCs. Without these routes, the transit gateway would drop return packets, breaking bidirectional communication.
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 a route table for the shared services VPC that allows routes to both production and development
Why this is correct
Shared services must be able to send traffic back.
- ✓
Attach each VPC to the transit gateway
Why this is correct
Attachments are required for connectivity.
- ✓
Create a separate route table for the production and development VPCs that allows only routes to shared services
Why this is correct
Separate route tables isolate traffic.
- ✗
Create a VPC peering connection between production and development
Why it's wrong here
VPC peering would allow direct communication.
- ✗
Use a single transit gateway route table for all attachments
Why it's wrong here
Single route table would allow all-to-all communication.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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