- A
Configure network security groups (NSGs) with deny-all inbound rules by default, then allow only necessary traffic.
NSGs reduce attack surface by blocking unwanted traffic.
- B
Use Azure Private Endpoints for all Azure services to remove public endpoints.
Why wrong: Private endpoints reduce exposure but do not mitigate DDoS attacks; attacks can still target public endpoints of other services.
- C
Use Azure Web Application Firewall (WAF) on Application Gateway to protect web applications.
WAF protects against application-layer DDoS attacks and exploits.
- D
Deploy Azure Firewall with threat intelligence-based filtering.
Why wrong: Azure Firewall can filter malicious traffic but is not a primary DDoS mitigation tool; DDoS protection is specialized.
- E
Enable Azure DDoS Network Protection on the virtual network.
DDoS Network Protection is a managed service that mitigates volumetric attacks.
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.
You have an Azure virtual network that hosts a critical application. You need to protect the virtual network from DDoS attacks. Which THREE actions should you take to implement a defense-in-depth approach?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Configure network security groups (NSGs) with deny-all inbound rules by default, then allow only necessary traffic.
Options A, C, and D are correct. Azure DDoS Network Protection provides mitigation at the network layer. NSGs filter unwanted traffic, and WAF protects web applications. Azure Firewall is for general traffic inspection, not specifically DDoS. Private endpoints help with exposure but not DDoS.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure network security groups (NSGs) with deny-all inbound rules by default, then allow only necessary traffic.
Why this is correct
NSGs reduce attack surface by blocking unwanted traffic.
Related concept
Standard ACLs match source addresses.
- ✗
Use Azure Private Endpoints for all Azure services to remove public endpoints.
Why it's wrong here
Private endpoints reduce exposure but do not mitigate DDoS attacks; attacks can still target public endpoints of other services.
- ✓
Use Azure Web Application Firewall (WAF) on Application Gateway to protect web applications.
Why this is correct
WAF protects against application-layer DDoS attacks and exploits.
Related concept
Standard ACLs match source addresses.
- ✗
Deploy Azure Firewall with threat intelligence-based filtering.
Why it's wrong here
Azure Firewall can filter malicious traffic but is not a primary DDoS mitigation tool; DDoS protection is specialized.
- ✓
Enable Azure DDoS Network Protection on the virtual network.
Why this is correct
DDoS Network Protection is a managed service that mitigates volumetric attacks.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related AZ-500 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this AZ-500 question test?
Secure networking — This question tests Secure networking — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Configure network security groups (NSGs) with deny-all inbound rules by default, then allow only necessary traffic. — Options A, C, and D are correct. Azure DDoS Network Protection provides mitigation at the network layer. NSGs filter unwanted traffic, and WAF protects web applications. Azure Firewall is for general traffic inspection, not specifically DDoS. Private endpoints help with exposure but not DDoS.
What should I do if I get this AZ-500 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related AZ-500 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
This AZ-500 practice question is part of Courseiva's free Microsoft 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 AZ-500 exam.
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