The answer is to create VPC attachments in each account to connect to a shared Transit Gateway, as this enables centralized routing without VPC peering. This works because AWS Transit Gateway acts as a hub-and-spoke router, and when created in a central networking account, it can be shared with other accounts using AWS Resource Access Manager (RAM), allowing each account to attach its VPCs directly to the same Transit Gateway. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of cross-account network architecture with Transit Gateway, often appearing as a multi-step design question where the trap is assuming VPC peering or direct connections are needed. The key is remembering that Transit Gateway itself is not cross-account by default—it must be shared via RAM, and each account must create its own VPC attachment. Memory tip: think “RAM the hub, attach the spokes” to recall that sharing the Transit Gateway via RAM is the prerequisite for cross-account VPC attachments.
SAP-C02 Practice Question: Design Solutions for Organizational Complexity
This SAP-C02 practice question tests your understanding of design solutions for organizational complexity. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has a multi-account AWS environment and wants to implement a secure, scalable cross-account network architecture using AWS Transit Gateway. Which TWO steps should be taken?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a Transit Gateway in a central networking account and share it with other accounts using AWS Resource Access Manager
Option B is correct because AWS Transit Gateway must be created in a central networking account and then shared with other accounts using AWS Resource Access Manager (RAM) to enable cross-account connectivity without VPC peering. This centralizes routing and simplifies network management across multiple VPCs and accounts.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Deploy VPC endpoints in each account for communication
Why it's wrong here
VPC endpoints are for accessing AWS services privately, not for inter-VPC routing.
✓
Create a Transit Gateway in a central networking account and share it with other accounts using AWS Resource Access Manager
Why this is correct
RAM allows sharing the Transit Gateway with other accounts.
Related concept
Read the scenario before looking for a memorised answer.
✓
Create VPC attachments in each account to connect to the shared Transit Gateway
Why this is correct
VPC attachments connect each VPC to the Transit Gateway.
Related concept
Read the scenario before looking for a memorised answer.
✗
Establish VPC peering connections between each account and the central networking account
Why it's wrong here
Transit Gateway eliminates the need for VPC peering.
✗
Set up AWS Direct Connect between all accounts
Why it's wrong here
Direct Connect is for on-premises connectivity, not inter-account.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse VPC endpoints (used for service access) with Transit Gateway (used for VPC-to-VPC routing), or assume VPC peering is sufficient for multi-account scalability despite its non-transitive nature and management overhead.
Detailed technical explanation
How to think about this question
Transit Gateway uses a route table per attachment to control traffic flow, and when shared via RAM, the Transit Gateway ID is visible in the receiving account, allowing VPC attachments to be created directly. The central account manages propagation and static routes, while each participating account retains control over its own VPC route tables, enabling granular security and compliance boundaries.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Design Solutions for Organizational Complexity — This question tests Design Solutions for Organizational Complexity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a Transit Gateway in a central networking account and share it with other accounts using AWS Resource Access Manager — Option B is correct because AWS Transit Gateway must be created in a central networking account and then shared with other accounts using AWS Resource Access Manager (RAM) to enable cross-account connectivity without VPC peering. This centralizes routing and simplifies network management across multiple VPCs and accounts.
What should I do if I get this SAP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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