ANS-C01 Network Management and Operations Practice Question
A company is using AWS Transit Gateway to connect multiple VPCs and on-premises networks via VPN. The network team notices that traffic between two VPCs in different regions is being dropped intermittently. What is the most likely cause?
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
✓
Transit Gateway cannot route traffic between VPCs in different regions without inter-region peering
AWS Transit Gateway is a regional resource. To route traffic between VPCs in different regions, you must explicitly configure Transit Gateway inter-region peering. Without it, Transit Gateway cannot route traffic across regions, causing intermittent drops if traffic attempts to traverse regions. Option B is incorrect because security groups are stateful and would not cause intermittent drops. Option C is incorrect because route propagation issues typically cause persistent failures, not intermittent drops. Option D is incorrect because NAT Gateway is used for outbound internet traffic, not inter-VPC traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Transit Gateway cannot route traffic between VPCs in different regions without inter-region peering
Why this is correct
Transit Gateway is regional; inter-region connectivity requires explicit peering.
- ✗
Security groups in the source VPC are blocking traffic
Why it's wrong here
Security groups are stateful and would block traffic consistently, not intermittently.
- ✗
Route tables in the Transit Gateway are not propagating routes correctly
Why it's wrong here
Route propagation issues would cause consistent failures, not intermittent drops.
- ✗
NAT Gateway in the source VPC is causing asymmetric routing
Why it's wrong here
NAT Gateway is for internet-bound traffic, not for inter-VPC traffic.
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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.