The answer is AWS Organizations with Service Control Policies (SCPs). This is correct because SCPs allow you to centrally manage and enforce security policies across multiple AWS accounts by setting permission guardrails that restrict what actions accounts and their resources can perform, including network-level controls like disabling public subnets in all VPCs. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this tests your understanding of governance at the organization level versus resource-level tools; a common trap is confusing AWS Config, which only evaluates and reports on compliance, with SCPs that actually enforce policies. Remember that SCPs act as a central security policy across AWS accounts with SCPs, not as a detective tool—they are the "gatekeeper" before any IAM or resource-based policy is evaluated. A useful memory tip: think of SCPs as the "bouncer at the door" for your entire AWS organization, blocking disallowed actions before they even reach individual accounts.
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 wants to centrally manage and enforce security policies across multiple AWS accounts and VPCs. They need to ensure that all VPCs have a specific set of rules, such as disabling public subnets. Which AWS service should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS Organizations with Service Control Policies (SCPs)
Option D is correct because AWS Organizations with Service Control Policies (SCPs) can centrally control permissions across accounts. Option A is wrong because AWS Config evaluates resource configurations but does not enforce policies. Option B is wrong because IAM is for users and roles, not for VPC-level controls. Option C is wrong because AWS Shield is for DDoS protection.
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.
✓
AWS Organizations with Service Control Policies (SCPs)
Why this is correct
SCPs allow central control over the maximum permissions for accounts, enabling enforcement of network policies.
IAM controls user permissions, not network-level policies.
✗
AWS Shield
Why it's wrong here
AWS Shield is a DDoS protection service.
✗
AWS Config
Why it's wrong here
AWS Config is for compliance monitoring, not policy enforcement.
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 ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: AWS Organizations with Service Control Policies (SCPs) — Option D is correct because AWS Organizations with Service Control Policies (SCPs) can centrally control permissions across accounts. Option A is wrong because AWS Config evaluates resource configurations but does not enforce policies. Option B is wrong because IAM is for users and roles, not for VPC-level controls. Option C is wrong because AWS Shield is for DDoS protection.
What should I do if I get this ANS-C01 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 ANS-C01 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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