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 has a VPC with multiple subnets. They have an Application Load Balancer (ALB) in a public subnet and a web server fleet in private subnets. The security team wants to ensure that only the ALB can communicate with the web servers. Which security group configuration 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
✓
Set the web server security group inbound rule to allow traffic from the ALB's security group.
Option B is correct because referencing the ALB's security group as the source allows only traffic from the ALB. Option A is wrong because allowing all traffic from the VPC CIDR is too broad. Option C is wrong because allowing all traffic from the public subnet is still broad. Option D is wrong because allowing from 0.0.0.0/0 allows all inbound traffic.
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.
✓
Set the web server security group inbound rule to allow traffic from the ALB's security group.
Set the web server security group inbound rule to allow traffic from the public subnet CIDR.
Why it's wrong here
This allows traffic from any instance in the public subnet, not just the ALB.
✗
Set the web server security group inbound rule to allow traffic from the VPC CIDR.
Why it's wrong here
This allows traffic from any resource in the VPC, not just the ALB.
✗
Set the web server security group inbound rule to allow traffic from 0.0.0.0/0.
Why it's wrong here
This allows all inbound traffic, bypassing the ALB.
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 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
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: Set the web server security group inbound rule to allow traffic from the ALB's security group. — Option B is correct because referencing the ALB's security group as the source allows only traffic from the ALB. Option A is wrong because allowing all traffic from the VPC CIDR is too broad. Option C is wrong because allowing all traffic from the public subnet is still broad. Option D is wrong because allowing from 0.0.0.0/0 allows all inbound traffic.
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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