The answer is to use AWS RAM to share the subnet with the organization. AWS Resource Access Manager (RAM) enables you to share a VPC subnet across multiple accounts within the same AWS Organization without requiring VPC peering or VPN connections, because RAM creates a transitive, centrally managed sharing model that preserves native VPC security groups and network ACLs. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of centralized resource sharing versus point-to-point networking—a common trap is defaulting to VPC peering, which only supports one-to-one connections and cannot scale to multiple accounts. Remember the memory tip: "RAM shares, Peering pairs"—if you need to share a subnet with many accounts in an Organization, always reach for RAM first.
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 needs to share a VPC subnet with multiple accounts in the same AWS Organization. What is the MOST secure way to achieve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS RAM to share the subnet with the organization.
AWS Resource Access Manager (RAM) allows sharing subnets securely without VPC peering. Option A is wrong because VPC peering is one-to-one. Option C is wrong because VPN adds complexity. Option D is wrong because it doesn't share the subnet.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 Transit Gateway and attach all accounts.
Why it's wrong here
Transit Gateway enables routing, not subnet sharing.
Create a VPC peering connection between each account and the VPC owner.
Why it's wrong here
Peering does not share subnets; each account would need its own resources.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SAP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Design Solutions for Organizational Complexity — This question tests Design Solutions for Organizational Complexity — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use AWS RAM to share the subnet with the organization. — AWS Resource Access Manager (RAM) allows sharing subnets securely without VPC peering. Option A is wrong because VPC peering is one-to-one. Option C is wrong because VPN adds complexity. Option D is wrong because it doesn't share the subnet.
What should I do if I get this SAP-C02 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SAP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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