- A
The workload accounts have not accepted the resource share invitation.
Option A is correct because AWS RAM requires the workload accounts to accept the resource share invitation before they can see and use the shared subnet. Until acceptance, the subnet is not visible.
- B
The workload accounts have a default VPC that conflicts with the shared subnet.
Why wrong: Option B is incorrect. A default VPC in the workload account does not conflict with or hide a shared subnet. The subnet is shared via RAM and is independent of any existing VPCs.
- C
The workload accounts do not have the necessary IAM permissions to use shared subnets.
Why wrong: Option C is incorrect. While IAM permissions are necessary to launch instances, the inability to see the shared subnet is typically due to not accepting the RAM share, not missing IAM permissions. The workload accounts already have RAM permissions to view shared resources if they have accepted.
- D
The subnet is in a different AWS Region than the workload accounts.
Why wrong: Option D is incorrect. Subnet sharing via AWS RAM is limited to the same region. If the subnet were in a different region, the network team would not have been able to share it with the workload accounts. Since the share was created, the regions match, so this is not the cause.
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 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
The workload accounts have not accepted the resource share invitation.
Option A is correct because AWS RAM requires workload accounts to accept the resource share invitation before they can see and use the shared subnet. Option B is incorrect because having a default VPC in the workload account does not prevent visibility of shared subnets; the subnet will appear in the VPC list regardless. Option C is incorrect because the primary issue is the acceptance of the resource share, not IAM permissions; while IAM permissions may be needed to launch instances, the subnet itself will not be visible until the share is accepted. Option D is incorrect because AWS RAM supports sharing across regions, so a different region would not prevent the subnet from being visible after acceptance.
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
Option A is correct because AWS RAM requires the workload accounts to accept the resource share invitation before they can see and use the shared subnet. Until acceptance, the subnet is not visible.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
- ✗
The workload accounts have a default VPC that conflicts with the shared subnet.
Why it's wrong here
Option B is incorrect. A default VPC in the workload account does not conflict with or hide a shared subnet. The subnet is shared via RAM and is independent of any existing VPCs.
- ✗
The workload accounts do not have the necessary IAM permissions to use shared subnets.
Why it's wrong here
Option C is incorrect. While IAM permissions are necessary to launch instances, the inability to see the shared subnet is typically due to not accepting the RAM share, not missing IAM permissions. The workload accounts already have RAM permissions to view shared resources if they have accepted.
- ✗
The subnet is in a different AWS Region than the workload accounts.
Why it's wrong here
Option D is incorrect. Subnet sharing via AWS RAM is limited to the same region. If the subnet were in a different region, the network team would not have been able to share it with the workload accounts. Since the share was created, the regions match, so this is not the cause.
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.
Visual reference
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.
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Design Solutions for Organizational Complexity — study guide chapter
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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 — 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 AWS RAM requires workload accounts to accept the resource share invitation before they can see and use the shared subnet. Option B is incorrect because having a default VPC in the workload account does not prevent visibility of shared subnets; the subnet will appear in the VPC list regardless. Option C is incorrect because the primary issue is the acceptance of the resource share, not IAM permissions; while IAM permissions may be needed to launch instances, the subnet itself will not be visible until the share is accepted. Option D is incorrect because AWS RAM supports sharing across regions, so a different region would not prevent the subnet from being visible after acceptance.
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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Last reviewed: Jun 20, 2026
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