The answer is that the workload accounts have not accepted the resource share invitation. This is because AWS Resource Access Manager (RAM) operates on an explicit acceptance model; simply creating a resource share and associating principals does not automatically grant visibility or access. Until each workload account navigates to the RAM console or uses the AWS CLI to accept the pending invitation, the shared VPC subnet will remain invisible when launching EC2 instances. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of cross-account networking prerequisites, often appearing as a distractor where candidates assume IAM permissions or regional constraints are the issue. A common trap is to overlook the acceptance step, especially when the network team has already shared the resource. Remember the mnemonic: “Share, then Accept—or the subnet stays inept.”
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 has a multi-account AWS environment with a central network account and multiple workload accounts. They want to share a VPC subnet in the network account with the workload accounts so that they can launch EC2 instances directly into the shared subnet. The network team has created a VPC with a subnet and shared it using AWS Resource Access Manager (RAM) with the workload accounts. However, the workload accounts cannot see the shared subnet when launching EC2 instances. 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 workload accounts have not accepted the resource share invitation.
Option A is correct because RAM requires an explicit acceptance of the resource share by the workload accounts. Until they accept, the subnet is not visible. Option B is wrong because IAM permissions are needed but the issue is acceptance. Option C is wrong because sharing is not limited to the same region. Option D is wrong because default VPC does not affect shared subnets.
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 workload accounts have not accepted the resource share invitation.
Why this is correct
RAM requires acceptance before resources appear.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
The workload accounts have a default VPC that conflicts with the shared subnet.
Why it's wrong here
Default VPC does not block shared subnets.
✗
The workload accounts do not have the necessary IAM permissions to use shared subnets.
Why it's wrong here
IAM permissions are needed but acceptance is the first step.
✗
The subnet is in a different AWS Region than the workload accounts.
Why it's wrong here
Sharing can be cross-region.
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 workload accounts have not accepted the resource share invitation. — Option A is correct because RAM requires an explicit acceptance of the resource share by the workload accounts. Until they accept, the subnet is not visible. Option B is wrong because IAM permissions are needed but the issue is acceptance. Option C is wrong because sharing is not limited to the same region. Option D is wrong because default VPC does not affect shared subnets.
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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