The answer is to use Azure Firewall Manager to create a global deny rule for the IP address across all firewalls. This is the most efficient method because Azure Firewall Manager centralizes policy management, allowing you to define a single network rule that blocks the malicious IP at the network level and automatically applies it to all Azure Firewall instances across your subscription, regardless of region or virtual hub. On the SC-200 exam, this question tests your understanding of centralized versus decentralized security controls; a common trap is to confuse Azure Firewall Manager with individual firewall rules or Network Security Groups (NSGs), which are per-subnet and require manual replication. Remember that for subscription-wide, network-level blocking, you need a policy-based approach, not resource-specific rules. A useful memory tip is “Manager for global, Firewall for local”—Azure Firewall Manager handles the big picture, while a single Azure Firewall rule only covers its own instance.
SC-200 Respond to security incidents Practice Question
This SC-200 practice question tests your understanding of respond to security incidents. 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.
During a security incident, you need to block a malicious IP address at the network level for all Azure resources in a subscription. You have Azure Firewall deployed. What is the MOST efficient method to implement the block?
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 global deny rule for the IP address across all firewalls.
Option D is correct because Azure Firewall Manager allows central management of firewall policies, including application and network rules across subscriptions. Option A is wrong because NSGs are per-subnet and not as efficient. Option B is wrong because Azure Firewall policies are not automatically applied to all VMs. Option C is wrong because each Azure Firewall rule applies to that firewall only.
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.
✗
Block the IP using Microsoft Defender for Cloud's adaptive network hardening.
Why it's wrong here
Adaptive network hardening recommends NSG rules but does not block immediately.
✓
Use Azure Firewall Manager to create a global deny rule for the IP address across all firewalls.
Why this is correct
Firewall Manager can apply a policy to multiple firewalls, ensuring consistent blocking.
Create a network security group (NSG) rule on each virtual network subnet to deny the IP.
Why it's wrong here
NSG rules are per-subnet and require manual application to all subnets.
✗
Add a rule to the Azure Firewall policy to deny outbound traffic to the IP address.
Why it's wrong here
A single rule in the firewall policy blocks traffic through that firewall, but if multiple firewalls exist, each needs the rule.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-200 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 SC-200 subnetting questions on CIDR, address ranges, and subnet selection.
Respond to security incidents — This question tests Respond to security incidents — 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 global deny rule for the IP address across all firewalls. — Option D is correct because Azure Firewall Manager allows central management of firewall policies, including application and network rules across subscriptions. Option A is wrong because NSGs are per-subnet and not as efficient. Option B is wrong because Azure Firewall policies are not automatically applied to all VMs. Option C is wrong because each Azure Firewall rule applies to that firewall only.
What should I do if I get this SC-200 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 SC-200 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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