SAP-C02 Practice Question: Design Solutions for Organizational Complexity
A company has a multi-account AWS environment with a central network account and multiple workload accounts. They want to use AWS Transit Gateway to connect VPCs across accounts. The network team has created a Transit Gateway in the network account and shared it using AWS Resource Access Manager (RAM) with the workload accounts. The workload accounts have created VPC attachments to the Transit Gateway. However, traffic is not flowing between the VPCs. The route tables in the workload VPCs have routes pointing to the Transit Gateway. 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
✓
The Transit Gateway route tables do not have routes for the attached VPCs.
The most likely cause is that the Transit Gateway route tables do not have routes for the attached VPCs. Even though the Transit Gateway is shared and VPC attachments are created, the Transit Gateway route tables must contain routes pointing to the attached VPCs for traffic to flow. By default, VPC attachments are not automatically propagated to the Transit Gateway route table. Option A is incorrect because route propagation is automatic when attachments are created, but only if the route table is configured for propagation. Option C is incorrect because security groups are stateful and allow return traffic; they would not block traffic between VPCs if the correct rules are in place. Option D is incorrect because VPC flow logs are a monitoring tool and do not affect traffic flow.
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 Transit Gateway is in a different AWS account, so route propagation is not automatic.
Why it's wrong here
Route propagation must be configured, but account is not the issue.
- ✓
The Transit Gateway route tables do not have routes for the attached VPCs.
Why this is correct
Transit Gateway route tables need routes to forward traffic.
- ✗
The security groups in the workload VPCs are blocking traffic.
Why it's wrong here
Security groups are per-VPC and not related to Transit Gateway routing.
- ✗
VPC flow logs are not enabled.
Why it's wrong here
Flow logs do not affect traffic flow.
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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.