ANS-C01 Network Management and Operations Practice Question
A company uses AWS Transit Gateway to connect multiple VPCs and on-premises networks. The network team notices that traffic from a specific VPC to an on-premises network is being dropped. All other VPCs can reach the on-premises network. Which configuration should be checked first?
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
✓
Check the Transit Gateway route tables
The issue is isolated to one VPC, so route tables are the most likely cause. Transit Gateway route tables might not have the route for the on-premises network propagated from that VPC's attachment.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Check the on-premises firewall rules
Why it's wrong here
Since other VPCs can reach on-premises, the firewall is not blocking all traffic; the issue is specific to one VPC.
- ✗
Check the VPC's security groups
Why it's wrong here
Security groups are stateful and apply at the instance level; if the issue is at the network layer, route tables are more likely.
- ✗
Check the VPC's network ACLs
Why it's wrong here
Network ACLs are stateless and apply at the subnet level, but the issue is specific to one VPC's traffic to on-premises; other VPCs work, so it's likely not a global ACL issue.
- ✓
Check the Transit Gateway route tables
Why this is correct
The Transit Gateway route table associated with the VPC attachment might be missing the route to the on-premises network.
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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.