- A
Create a central transit gateway with a single route table. Use VPC endpoints to control traffic between VPCs.
Why wrong: VPC endpoints do not control traffic between VPCs through a transit gateway.
- B
Create VPC peering connections between all VPCs and use route tables to control access.
Why wrong: VPC peering does not scale well and does not provide central management.
- C
Create a central transit gateway with separate route tables for each VPC attachment. Use network ACLs in each VPC to restrict traffic between specific VPCs.
Separate route tables allow granular routing, and network ACLs can filter traffic at the subnet level.
- D
Create a central transit gateway with a single route table. Use security groups in each VPC to restrict traffic.
Why wrong: Security groups cannot filter traffic traversing the transit gateway.
SAP-C02 Practice Question: Design Solutions for Organizational Complexity
This SAP-C02 practice question tests your understanding of design solutions for organizational complexity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 global company uses AWS Organizations with multiple organizational units (OUs) for different business units. The networking team wants to ensure that all VPCs across all accounts can communicate through a central transit gateway. However, the security team requires that specific accounts cannot access each other's resources. Which combination of actions should the company take to meet these requirements?
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
Create a central transit gateway with separate route tables for each VPC attachment. Use network ACLs in each VPC to restrict traffic between specific VPCs.
Option C is correct because it uses a central transit gateway with separate route tables for each VPC attachment, which allows the networking team to enable communication between all VPCs via the transit gateway while the security team can isolate specific accounts by controlling which route tables are associated with which VPC attachments. Network ACLs in each VPC provide an additional layer of stateless traffic filtering to restrict traffic between specific VPCs, complementing the route table isolation.
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.
- ✗
Create a central transit gateway with a single route table. Use VPC endpoints to control traffic between VPCs.
Why it's wrong here
VPC endpoints do not control traffic between VPCs through a transit gateway.
- ✗
Create VPC peering connections between all VPCs and use route tables to control access.
Why it's wrong here
VPC peering does not scale well and does not provide central management.
- ✓
Create a central transit gateway with separate route tables for each VPC attachment. Use network ACLs in each VPC to restrict traffic between specific VPCs.
Why this is correct
Separate route tables allow granular routing, and network ACLs can filter traffic at the subnet level.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a central transit gateway with a single route table. Use security groups in each VPC to restrict traffic.
Why it's wrong here
Security groups cannot filter traffic traversing the transit gateway.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a single transit gateway route table with security groups or network ACLs is sufficient, but security groups cannot filter traffic at the VPC level and network ACLs alone do not prevent the transit gateway from routing traffic between VPCs—route table isolation is the primary mechanism to enforce such restrictions.
Detailed technical explanation
How to think about this question
AWS Transit Gateway supports multiple route tables, each of which can be associated with one or more attachments and can propagate routes from selected attachments. By creating separate route tables for each VPC attachment and only propagating routes from allowed peer VPCs, you can enforce transitive routing isolation at the network layer. Network ACLs provide stateless filtering at the subnet boundary, allowing you to explicitly deny traffic between specific VPC CIDR ranges even if the transit gateway routes the traffic, but this adds operational complexity and is less scalable than using route table segmentation alone.
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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
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 central transit gateway with separate route tables for each VPC attachment. Use network ACLs in each VPC to restrict traffic between specific VPCs. — Option C is correct because it uses a central transit gateway with separate route tables for each VPC attachment, which allows the networking team to enable communication between all VPCs via the transit gateway while the security team can isolate specific accounts by controlling which route tables are associated with which VPC attachments. Network ACLs in each VPC provide an additional layer of stateless traffic filtering to restrict traffic between specific VPCs, complementing the route table isolation.
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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Last reviewed: Jul 4, 2026
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