- A
Configure App Service Access Restrictions to deny all public traffic and enable Azure Front Door private link.
Why wrong: Private Link would change the architecture but does not block direct internet traffic unless combined with other restrictions.
- B
Configure Azure Front Door to use a custom domain and enable Azure WAF on Front Door.
Why wrong: WAF does not restrict which clients can reach the backend; it only filters malicious requests.
- C
Configure App Service Access Restrictions to allow only the 'AzureFrontDoor.Backend' service tag.
Why wrong: While the service tag helps, it does not verify that the request came from your Front Door instance; another Front Door could also use those IPs.
- D
Configure App Service Access Restrictions to allow only the Azure Front Door backend IP ranges and validate the X-Azure-FDID header.
This ensures only traffic from your Front Door instance (checked via header) and from Front Door IP ranges is allowed.
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 organization is deploying a multi-region application using Azure Front Door to distribute traffic. You need to ensure that only traffic from Azure Front Door can reach the backend origins (App Services) and that no direct internet traffic bypasses Front Door. What combination of steps should you take?
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 App Service Access Restrictions to allow only the Azure Front Door backend IP ranges and validate the X-Azure-FDID header.
Azure Front Door uses a set of backend IP ranges. By configuring Access Restrictions on App Service to allow only those IP ranges and enabling the 'X-Azure-FDID' header check, you ensure only Front Door traffic is accepted. Disabling public access entirely would break Front Door's ability to reach the backend.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 App Service Access Restrictions to deny all public traffic and enable Azure Front Door private link.
Why it's wrong here
Private Link would change the architecture but does not block direct internet traffic unless combined with other restrictions.
- ✗
Configure Azure Front Door to use a custom domain and enable Azure WAF on Front Door.
Why it's wrong here
WAF does not restrict which clients can reach the backend; it only filters malicious requests.
- ✗
Configure App Service Access Restrictions to allow only the 'AzureFrontDoor.Backend' service tag.
Why it's wrong here
While the service tag helps, it does not verify that the request came from your Front Door instance; another Front Door could also use those IPs.
- ✓
Configure App Service Access Restrictions to allow only the Azure Front Door backend IP ranges and validate the X-Azure-FDID header.
Why this is correct
This ensures only traffic from your Front Door instance (checked via header) and from Front Door IP ranges is allowed.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-500 NAT questions on configuration and troubleshooting.
- →
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FAQ
Questions learners often ask
What does this AZ-500 question test?
Secure networking — This question tests Secure networking — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Configure App Service Access Restrictions to allow only the Azure Front Door backend IP ranges and validate the X-Azure-FDID header. — Azure Front Door uses a set of backend IP ranges. By configuring Access Restrictions on App Service to allow only those IP ranges and enabling the 'X-Azure-FDID' header check, you ensure only Front Door traffic is accepted. Disabling public access entirely would break Front Door's ability to reach the backend.
What should I do if I get this AZ-500 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-500 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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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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