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 uses AWS Organizations with multiple accounts. The security team wants to enforce that no security group allows inbound SSH (port 22) from 0.0.0.0/0. Which policy type should be used?
Network ACL
Why wrong: NACLs are per-subnet, not account-wide.
IAM policy
Why wrong: IAM policies do not control resource configurations directly.
Service Control Policy (SCP)
SCPs can deny creation of security groups with SSH from 0.0.0.0/0.
AWS Config rule
Why wrong: Config rules are detective, not preventive.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Service Control Policy (SCP)
Option A is correct because an SCP can restrict permissions at the account level. Option B is wrong because IAM policies apply to users/roles, not resource configurations. Option C is wrong because AWS Config rules are detective, not preventive. Option D is wrong because NACLs are per-subnet, not account-wide.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Network ACL
Why it's wrong here
NACLs are per-subnet, not account-wide.
IAM policy
Why it's wrong here
IAM policies do not control resource configurations directly.
Service Control Policy (SCP)
AWS Config rule
Why it's wrong here
Config rules are detective, not preventive.
Common exam traps
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
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.
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
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
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.
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FAQ
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — CIDR notation defines the prefix length..
The correct answer is: Service Control Policy (SCP) — Option A is correct because an SCP can restrict permissions at the account level. Option B is wrong because IAM policies apply to users/roles, not resource configurations. Option C is wrong because AWS Config rules are detective, not preventive. Option D is wrong because NACLs are per-subnet, not account-wide.
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.
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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