This SCS-C02 practice question tests your understanding of management and security 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 has an AWS account with a single VPC and multiple subnets. The security team wants to ensure that no network ACL (NACL) allows inbound SSH (port 22) from 0.0.0.0/0. Which AWS service can be used to detect and alert on such non-compliant NACLs?
Amazon Inspector
Why wrong: Incorrect: Inspector assesses EC2 instances, not NACLs.
Amazon GuardDuty
Why wrong: Incorrect: GuardDuty detects threats, not configuration compliance.
AWS Config
Correct: AWS Config can evaluate NACL rules with custom rules.
AWS CloudTrail
Why wrong: Incorrect: CloudTrail logs API calls but does not evaluate resource configurations.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
AWS Config
Option D is correct because AWS Config can evaluate NACL rules using a custom rule that checks for inbound SSH from 0.0.0.0/0. Option A is wrong because AWS CloudTrail logs API calls but does not evaluate NACL configurations. Option B is wrong because Amazon GuardDuty focuses on threat detection. Option C is wrong because AWS Inspector assesses vulnerabilities on EC2, not NACLs.
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.
Amazon Inspector
Why it's wrong here
Incorrect: Inspector assesses EC2 instances, not NACLs.
Amazon GuardDuty
Why it's wrong here
Incorrect: GuardDuty detects threats, not configuration compliance.
AWS Config
Why this is correct
Correct: AWS Config can evaluate NACL rules with custom rules.
Related concept
CIDR notation defines the prefix length.
AWS CloudTrail
Why it's wrong here
Incorrect: CloudTrail logs API calls but does not evaluate resource configurations.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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 SCS-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Management and Security Governance — study guide chapter
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FAQ
Management and Security Governance — This question tests Management and Security Governance — CIDR notation defines the prefix length..
The correct answer is: AWS Config — Option D is correct because AWS Config can evaluate NACL rules using a custom rule that checks for inbound SSH from 0.0.0.0/0. Option A is wrong because AWS CloudTrail logs API calls but does not evaluate NACL configurations. Option B is wrong because Amazon GuardDuty focuses on threat detection. Option C is wrong because AWS Inspector assesses vulnerabilities on EC2, not NACLs.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SCS-C02 subnetting questions on CIDR, address ranges, and subnet selection.
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
This SCS-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SCS-C02 exam.
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