SAP-C02 Practice Question: Design Solutions for Organizational Complexity
A company uses AWS Organizations with a multi-account setup. The central IT team manages a shared services VPC in the network account, which hosts a NAT gateway, a VPN connection to the on-premises network, and a transit gateway. Several application accounts have VPCs attached to the transit gateway. Recently, the application teams report that they cannot reach the on-premises network through the VPN. The network team confirms that the VPN is up and routes are propagated in the transit gateway route tables. However, the application VPCs are not receiving the routes. What is the MOST likely cause?
⚠ Common exam trap
A common mix-up: candidates confuse route propagation with route table association — candidates often assume that if routes are propagated into the transit gateway route table, all attached VPCs automatically receive them, but AWS requires an explicit association between the VPC attachment and the route table for route distribution.
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
✓
The transit gateway route tables are not associated with the application VPC attachments.
The most likely cause is that the transit gateway route tables are not associated with the application VPC attachments. Even if the VPN routes are propagated into the transit gateway route tables, the application VPCs will not receive those routes unless their VPC attachments are explicitly associated with the correct transit gateway route table. Without this association, the transit gateway does not propagate routes to the attached VPCs, leaving them unable to reach the on-premises network.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The application VPCs have route tables that override the transit gateway routes with local routes.
Why it's wrong here
Local routes are implicit and cannot be overridden; the issue is likely with route propagation.
- ✗
The VPN connection is not configured to advertise the on-premises CIDR to the transit gateway.
Why it's wrong here
The question states routes are propagated in the transit gateway route tables, so this is not the issue.
- ✗
The application VPCs have security groups that block traffic to the on-premises network.
Why it's wrong here
Security groups are stateful and operate at the instance level, not at the routing level; they would not prevent route propagation.
- ✓
The transit gateway route tables are not associated with the application VPC attachments.
Why this is correct
For routes to be effective, the transit gateway route table that contains the VPN routes must be associated with the VPC attachments; otherwise, they won't receive the routes.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAP-C02 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 SAP-C02 exam.