The answer is that the organization's sharing feature for Amazon VPC is not enabled in the management account. This is the most likely cause because AWS Resource Access Manager requires trusted access with AWS Organizations to be explicitly enabled for the VPC service before any resource shares—such as managed prefix lists containing IP address CIDR blocks—can be visible to member accounts. Without this setting, the RAM resource share is created but never propagated, leaving the shared prefix lists invisible to the target accounts. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of the prerequisite configuration for cross-account resource sharing, often appearing as a trap where candidates assume creating the share is sufficient. A common memory tip is to remember that RAM needs a formal introduction to Organizations: enable trusted access for each service you plan to share, or the member accounts will remain blind to the resources.
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 company uses AWS Organizations with hundreds of accounts. The central IT team wants to manage IP address ranges for VPCs across all accounts using a custom AWS Resource Access Manager (RAM) resource share. They have created a resource share containing the IP address CIDR blocks (as managed prefix lists) and shared it with the organization. However, some accounts cannot see the shared prefix lists. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The organization's sharing feature for Amazon VPC is not enabled in the management account.
Option D is correct because RAM sharing with an organization requires that all accounts have the sharing feature enabled via the Organization's trusted access. Option A is incorrect because RAM supports prefix lists. Option B is incorrect because resource shares can include multiple resources. Option C is incorrect because RAM sharing with the entire organization does not require individual invites.
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.
✓
The organization's sharing feature for Amazon VPC is not enabled in the management account.
Why this is correct
RAM requires enabling sharing with AWS Organizations for each service; VPC sharing must be enabled.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Managed prefix lists are not supported by AWS RAM.
Why it's wrong here
AWS RAM supports sharing of prefix lists and other VPC resources.
✗
The accounts need to accept the resource share invitation manually.
Why it's wrong here
When sharing with an organization, resources are automatically shared; no acceptance is needed.
✗
The resource share can only include one type of resource at a time.
Why it's wrong here
RAM resource shares can contain multiple resource types.
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: The organization's sharing feature for Amazon VPC is not enabled in the management account. — Option D is correct because RAM sharing with an organization requires that all accounts have the sharing feature enabled via the Organization's trusted access. Option A is incorrect because RAM supports prefix lists. Option B is incorrect because resource shares can include multiple resources. Option C is incorrect because RAM sharing with the entire organization does not require individual invites.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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