ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 is using AWS WAF to protect a web application behind an Application Load Balancer. They want to block requests from a specific IP address range. Which component should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IP set match condition in AWS WAF
Option C is correct because AWS WAF has IP set match conditions that allow you to specify IP addresses to block or allow. Option A is wrong because security groups are stateful firewalls for EC2 instances, not for ALB. Option B is wrong because NACLs are stateless firewalls at the subnet level, not integrated with ALB. Option D is wrong because AWS Shield Advanced is for DDoS protection, not IP-based blocking.
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.
✗
Security group associated with the ALB
Why it's wrong here
Security groups cannot be associated with ALBs directly; they are applied to ENIs.
✓
IP set match condition in AWS WAF
Why this is correct
AWS WAF uses IP sets to match IP addresses and can block them.
Shield Advanced provides DDoS protection but not granular IP blocking.
✗
Network ACL on the ALB's subnets
Why it's wrong here
NACLs are stateless and at the subnet level; ALB does not have a subnet-level control.
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: IP set match condition in AWS WAF — Option C is correct because AWS WAF has IP set match conditions that allow you to specify IP addresses to block or allow. Option A is wrong because security groups are stateful firewalls for EC2 instances, not for ALB. Option B is wrong because NACLs are stateless firewalls at the subnet level, not integrated with ALB. Option D is wrong because AWS Shield Advanced is for DDoS protection, not IP-based blocking.
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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