The answer is AWS Resource Access Manager (RAM) because it enables you to share a VPC subnet across accounts with the least operational overhead. RAM allows a centrally managed subnet from the networking account to be shared directly with workload accounts, so those accounts can launch EC2 instances into the same subnet without needing separate VPCs or complex networking configurations. This tests your understanding of centralized network design on the AWS Certified Solutions Architect Professional SAP-C02 exam, where the key trap is confusing VPC peering or Transit Gateway with subnet sharing—neither of those services actually share subnets; they only route traffic between separate VPCs. A common memory tip is to remember that RAM is for resource sharing, not routing: if you need to share a subnet, think “RAM, not peering or TGW.”
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 multiple AWS accounts and wants to share a centrally managed Amazon VPC subnet for workloads that require low latency. The VPC is in the networking account. Which solution meets these requirements with the LEAST operational overhead?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS Resource Access Manager (RAM) to share the subnet with the workload accounts.
Option B is correct because AWS Resource Access Manager (RAM) allows sharing subnets across accounts with minimal overhead. Option A is wrong because VPC peering does not share subnets. Option C is wrong because Transit Gateway attaches VPCs but does not share subnets. Option D is wrong because creating separate VPCs in each account defeats the purpose of a shared 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 separate VPC in each account and connect them with VPC peering.
Why it's wrong here
This adds complexity and does not share the subnet.
✓
Use AWS Resource Access Manager (RAM) to share the subnet with the workload accounts.
Why this is correct
RAM enables subnet sharing with minimal overhead.
Clue confirmation
The clue word "least" in the question point toward this answer.
Create VPC peering connections between the networking account and each workload account.
Why it's wrong here
VPC peering does not share subnets.
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 Resource Access Manager (RAM) to share the subnet with the workload accounts. — Option B is correct because AWS Resource Access Manager (RAM) allows sharing subnets across accounts with minimal overhead. Option A is wrong because VPC peering does not share subnets. Option C is wrong because Transit Gateway attaches VPCs but does not share subnets. Option D is wrong because creating separate VPCs in each account defeats the purpose of a shared 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.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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