Question 430
An AWS network engineer must address this specific condition: One tenant can unexpectedly reach another through a shared Transit Gateway despite separate VPC security groups. Which implementation or operational change BEST meets the requirement?
Explanation
Correct Answer
Routing segmentation is needed in addition to security-group controls for least-privilege multi-VPC topology. Confirm the change by checking that a path analysis finds no permitted transit route between tenant CIDRs.
Incorrect Answers
Organization membership alone does not necessarily authorize use of every privately owned network resource. It does not directly achieve the required result: a path analysis finds no permitted transit route between tenant CIDRs. The constraint is that routing segmentation is needed in addition to security-group controls for least-privilege multi-VPC topology.
An attached TGW does not automatically redirect packets that a VPC subnet table sends elsewhere. In this situation, routing segmentation is needed in addition to security-group controls for least-privilege multi-VPC topology. The proposed change does not ensure a path analysis finds no permitted transit route between tenant CIDRs.
IP connectivity and DNS namespace visibility are separate controls in multi-account architectures. The needed control instead targets Transit Gateway routing policies can expose paths between VPCs that were expected to be isolated; it succeeds when a path analysis finds no permitted transit route between tenant CIDRs.






AWS Certified Advanced Networking - Specialty ANS-C01 Practice Tests