The answer is to use Azure Firewall Manager to create a parent policy and assign it to all firewalls. This is correct because Azure Firewall Manager centralizes firewall policy management across multiple Azure subscriptions, allowing a single parent policy to be inherited by all child firewalls in a region, ensuring consistent rule enforcement without duplication. On the AZ-500 exam, this scenario tests your understanding of hierarchical policy application versus per-firewall configuration, with a common trap being confusion with Azure Policy (which enforces compliance but not firewall rules) or Network Security Groups (which are per-subnet and lack cross-subscription scope). Remember the key distinction: Azure Firewall Manager is for *firewall* policies, while Azure Policy is for *resource* compliance. A useful memory tip is "Parent policy, global reach" — think of the parent policy as a single source of truth that cascades down to all firewalls, saving you from manual replication across subscriptions.
AZ-500 Secure networking Practice Question
This AZ-500 practice question tests your understanding of secure networking. 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.
Your company has multiple Azure subscriptions managed through Azure Firewall Manager. You need to deploy Azure Firewall policies that apply to all subscriptions in a region. What is the most efficient way to manage this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Azure Firewall Manager to create a parent policy and assign it to all firewalls
Option D is correct because Azure Firewall Manager allows creating policy-based firewalls that can be applied across multiple subscriptions. Option A is wrong because each firewall has its own policy; you would need to duplicate. Option B is wrong because Azure Policy can enforce compliance but not directly manage firewall rules. Option C is wrong because NSGs are per-subnet, not cross-subscription.
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.
✗
Create a separate firewall policy for each subscription
Why it's wrong here
Inefficient and harder to manage consistently.
✓
Use Azure Firewall Manager to create a parent policy and assign it to all firewalls
Why this is correct
Firewall Manager centralizes policy management across subscriptions.
Use Azure Policy to enforce firewall rules across subscriptions
Why it's wrong here
Azure Policy can audit but not deploy complex firewall rules.
✗
Deploy a single network security group (NSG) to all VNets
Why it's wrong here
NSGs are not cross-subscription and provide limited capabilities.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-500 question in full detail.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-500 subnetting questions on CIDR, address ranges, and subnet selection.
Secure networking — This question tests Secure networking — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use Azure Firewall Manager to create a parent policy and assign it to all firewalls — Option D is correct because Azure Firewall Manager allows creating policy-based firewalls that can be applied across multiple subscriptions. Option A is wrong because each firewall has its own policy; you would need to duplicate. Option B is wrong because Azure Policy can enforce compliance but not directly manage firewall rules. Option C is wrong because NSGs are per-subnet, not cross-subscription.
What should I do if I get this AZ-500 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 AZ-500 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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