The answer is nothing, because shared subnets are automatically available to all accounts in the organization. When you use shared subnets in member accounts with AWS RAM, the member account does not need to accept a resource share invitation or perform any manual configuration, as sharing within AWS Organizations is seamless and automatic. This works because AWS RAM integrates directly with Organizations, so the shared subnets simply appear in the member account’s VPC console, allowing resources like EC2 instances to be launched into those subnets without additional steps. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this concept tests your understanding of centralized networking management and the default behavior of RAM within an organization—a common trap is assuming member accounts must accept the share or create an IAM role. Remember the memory tip: “Organizations auto-accept; no invite, no role, no fuss.”
SAP-C02 Practice Question: Design Solutions for Organizational Complexity
This SAP-C02 practice question tests your understanding of design solutions for organizational complexity. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 a large number of accounts. The networking team wants to centrally manage VPCs and subnets using AWS Resource Access Manager (RAM) and share subnets to member accounts. What must be done in the member accounts to use shared subnets?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Nothing, shared subnets are automatically available to all accounts in the organization.
Option A is correct because shared subnets automatically appear in the member account's VPC console, and they can launch resources without additional configuration. Option B is wrong because no resource share acceptance is needed if sharing within the same organization. Option C is wrong because shared subnets are already in the member account's VPC. Option D is wrong because no IAM role is needed for subnet sharing.
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 member account must create an IAM role to assume for launching resources in the shared subnet.
Why it's wrong here
No IAM role is needed; resources can be launched directly.
✗
The member account must create a VPC and then associate the shared subnet.
Why it's wrong here
The shared subnet is already associated with the member account's VPC.
✗
The member account must accept the resource share invitation.
Why it's wrong here
Resource shares within the organization are automatically accepted.
✓
Nothing, shared subnets are automatically available to all accounts in the organization.
Why this is correct
Within an organization, resource shares are automatically accepted.
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: Nothing, shared subnets are automatically available to all accounts in the organization. — Option A is correct because shared subnets automatically appear in the member account's VPC console, and they can launch resources without additional configuration. Option B is wrong because no resource share acceptance is needed if sharing within the same organization. Option C is wrong because shared subnets are already in the member account's VPC. Option D is wrong because no IAM role is needed for subnet sharing.
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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