ANS-C01 Network Design Practice Question
A company wants to connect multiple VPCs in different AWS Regions using AWS Transit Gateway. The company requires full mesh connectivity with centralized inspection of inter-Region traffic. Which TWO actions should the company take? (Choose TWO.)
⚠ Common exam trap
Candidates often confuse Transit Gateway peering with VPC peering, assuming VPC peering can provide transitive routing across multiple VPCs, or they mistakenly think VPN attachments are required for centralized inspection instead of using route tables and attachments.
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 Transit Gateway peering attachments between the Transit Gateways in each Region.
AWS Transit Gateway supports inter-Region peering attachments, which allow you to connect Transit Gateways in different Regions and route traffic between them using the AWS global network. Option D is correct because you can centralize traffic inspection by routing inter-Region traffic through a dedicated inspection VPC attached to one Transit Gateway, using separate route tables to force traffic through that VPC before forwarding it to the destination Region.
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 Transit Gateway peering attachments between the Transit Gateways in each Region.
Why this is correct
Peering attachments enable inter-Region connectivity.
- ✗
Create VPN attachments between each Transit Gateway and the inspection VPC.
Why it's wrong here
VPN attachments are not required; peering attachments are used.
- ✗
Use VPC peering connections between VPCs in different Regions.
Why it's wrong here
VPC peering does not scale for many VPCs.
- ✓
Route traffic through a central inspection VPC in one Region using Transit Gateway route tables.
Why this is correct
Central inspection can be done via route tables.
- ✗
Disable cross-Region peering on the Transit Gateway.
Why it's wrong here
Cross-Region peering is needed.
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Senior Network & Security Engineer · founder of Courseiva
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