- A
Configure IP restrictions on the App Service to allow only the Azure Front Door service tag AzureFrontDoor.Backend.
Using the service tag ensures only traffic from Azure Front Door's backend IP ranges is allowed, providing the primary restriction.
- B
Configure the App Service to require client certificates and configure Azure Front Door to present a certificate.
Why wrong: Client certificate authentication adds security but does not restrict access to only Azure Front Door; it requires certificate management and can be complex.
- C
Set the App Service access restrictions to deny all and then add a rule to allow the Azure Front Door service tag AzureFrontDoor.Frontend.
Why wrong: The Frontend service tag is for Front Door's frontend IPs, not the backend that forwards requests to App Service. This would not work.
- D
Configure a WAF policy to block all requests that do not contain the X-Azure-FDID header.
Why wrong: This would block legitimate traffic if the header is missing, but does not prevent direct access to the App Service bypassing Front Door; the header can be spoofed.
Quick Answer
The correct answer is to configure IP restrictions on the App Service to allow only the Azure Front Door service tag AzureFrontDoor.Backend. This works because Azure Front Door’s backend IP ranges are published as a service tag, and when you apply that tag in the App Service’s access restrictions, you block all traffic except requests routed through Front Door. On the AZ-500 exam, this scenario tests your understanding of network segmentation and service tags as a first line of defense, with a common trap being candidates who try to use the Front Door front-end IPs or forget that the X-Azure-FDID header validation is an additional, optional layer against spoofing. The key exam insight is that service tags are dynamic and automatically maintained by Azure, making them more reliable than static IP lists. A helpful memory tip is “Tag the back end, block the rest”—always pair the AzureFrontDoor.Backend tag with your App Service’s IP restriction rule to ensure only Front Door traffic reaches your app.
AZ-500 Secure networking Practice Question
This AZ-500 practice question tests your understanding of secure networking. 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.
Your organization has deployed Azure Front Door Premium with Web Application Firewall (WAF) policy in front of an Azure App Service. You need to ensure that only traffic from Azure Front Door is allowed to reach the App Service, and all other traffic is blocked. Which configuration should you implement?
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 IP restrictions on the App Service to allow only the Azure Front Door service tag AzureFrontDoor.Backend.
Restricting App Service access to only Azure Front Door's backend IP addresses using service tags (AzureFrontDoor.Backend) is the recommended approach. Additionally, configuring Azure Front Door to send the X-Azure-FDID header and validating it in the App Service provides an extra layer of security against spoofed traffic.
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 IP restrictions on the App Service to allow only the Azure Front Door service tag AzureFrontDoor.Backend.
Why this is correct
Using the service tag ensures only traffic from Azure Front Door's backend IP ranges is allowed, providing the primary restriction.
Related concept
Standard ACLs match source addresses.
- ✗
Configure the App Service to require client certificates and configure Azure Front Door to present a certificate.
Why it's wrong here
Client certificate authentication adds security but does not restrict access to only Azure Front Door; it requires certificate management and can be complex.
- ✗
Set the App Service access restrictions to deny all and then add a rule to allow the Azure Front Door service tag AzureFrontDoor.Frontend.
Why it's wrong here
The Frontend service tag is for Front Door's frontend IPs, not the backend that forwards requests to App Service. This would not work.
- ✗
Configure a WAF policy to block all requests that do not contain the X-Azure-FDID header.
Why it's wrong here
This would block legitimate traffic if the header is missing, but does not prevent direct access to the App Service bypassing Front Door; the header can be spoofed.
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 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 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.
- →
Secure networking — study guide chapter
Learn the concepts, then practise the questions
- →
Secure networking practice questions
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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 IP restrictions on the App Service to allow only the Azure Front Door service tag AzureFrontDoor.Backend. — Restricting App Service access to only Azure Front Door's backend IP addresses using service tags (AzureFrontDoor.Backend) is the recommended approach. Additionally, configuring Azure Front Door to send the X-Azure-FDID header and validating it in the App Service provides an extra layer of security against spoofed traffic.
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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