This ANS-C01 practice question tests your understanding of network management and operations. 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 has a VPC with multiple subnets and an internet gateway. The security team wants to detect and block malicious traffic patterns. Which AWS service should be used to provide intrusion detection and prevention?
AWS Network Firewall
Network Firewall provides managed intrusion detection and prevention.
Network ACLs
Why wrong: NACLs are stateless and do not provide intrusion prevention.
Security Groups
Why wrong: Security Groups are stateful firewalls but do not provide IPS.
AWS WAF
Why wrong: WAF is for web application layer, not network layer IPS.
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 Network Firewall
The correct answer is C because AWS Network Firewall provides managed intrusion detection and prevention capabilities. Option A is wrong because AWS WAF is for web application layer. Option B is wrong because Security Groups provide stateful filtering but not IPS. Option D is wrong because NACLs are stateless and do not provide intrusion prevention.
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.
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 ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Network Management and Operations — This question tests Network Management and Operations — CIDR notation defines the prefix length..
The correct answer is: AWS Network Firewall — The correct answer is C because AWS Network Firewall provides managed intrusion detection and prevention capabilities. Option A is wrong because AWS WAF is for web application layer. Option B is wrong because Security Groups provide stateful filtering but not IPS. Option D is wrong because NACLs are stateless and do not provide intrusion prevention.
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
This ANS-C01 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 ANS-C01 exam.
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