The correct answer is that the VPC must be in the same AWS Region as the shared subnet. This requirement exists because AWS Resource Access Manager (RAM) operates strictly within a single region; you cannot share a subnet across regions, as VPCs and their subnets are regional constructs. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this concept tests your understanding of RAM’s regional boundaries and the distinction between sharing a subnet versus creating one—a common trap is assuming the consumer must enable VPC sharing or that the subnet is created in the consumer account, when in fact RAM only grants access to an existing subnet. Remember the memory tip: “Same region, shared vision; no creation, just permission.”
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 wants to use AWS Resource Access Manager (RAM) to share a subnet in a VPC with other accounts in the organization. Which of the following are required? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The subnet must be created by the owning account.
Options A, C, and D are correct. Option B is wrong because RAM does not require VPC sharing to be enabled. Option E is wrong because the subnet is shared, not created by the consumer.
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.
Each consumer account must create a subnet in the same VPC.
Why it's wrong here
They use the shared subnet, not create a new one.
✗
Enable VPC sharing in the AWS Organizations console.
Why it's wrong here
Not required; RAM works with Organizations natively.
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 subnet must be created by the owning account. — Options A, C, and D are correct. Option B is wrong because RAM does not require VPC sharing to be enabled. Option E is wrong because the subnet is shared, not created by the consumer.
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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Question Discussion
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