The answer is Azure App Service custom domain and SSL binding, as this is the native capability within the platform itself. Azure App Service allows you to directly associate a custom domain name with your web app through the 'Custom domains' blade, and then secure it by uploading or configuring an SSL/TLS certificate in the 'TLS/SSL settings' blade, enabling HTTPS without needing any additional services like Azure Front Door or Application Gateway. For the AZ-900 exam, this tests your understanding of how core PaaS services handle domain and certificate management, often appearing in scenario-based questions where you must identify the simplest built-in solution. A common trap is confusing this with third-party DNS or CDN services, but remember that App Service handles the binding directly. Memory tip: think "Bind and Secure" — the custom domain is bound, then the SSL certificate secures the binding, all within the same App Service resource.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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.
A company needs to make their web application available with a custom domain name and SSL certificate. Which Azure service provides this capability for App Service?
Why wrong: While Azure DNS can manage your domain, custom domain binding with SSL is a native App Service feature.
B
Azure App Service custom domain and SSL binding
App Service natively supports adding custom domains and binding SSL certificates for HTTPS.
C
Azure Front Door
Why wrong: Front Door can also provide custom domains and SSL, but for simple App Service scenarios, the built-in capability is sufficient and directly integrated.
D
Azure Key Vault only
Why wrong: Key Vault stores certificates but App Service also needs custom domain configuration — Key Vault alone isn't sufficient.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure App Service custom domain and SSL binding
Azure App Service natively supports binding a custom domain to your web app and uploading or configuring an SSL/TLS certificate for HTTPS. This is done through the 'Custom domains' and 'TLS/SSL settings' blades in the portal, which directly associate the domain and certificate with the App Service resource, enabling secure access over HTTPS without additional services.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Azure DNS with Azure CDN
Why it's wrong here
While Azure DNS can manage your domain, custom domain binding with SSL is a native App Service feature.
✓
Azure App Service custom domain and SSL binding
Why this is correct
App Service natively supports adding custom domains and binding SSL certificates for HTTPS.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Front Door
Why it's wrong here
Front Door can also provide custom domains and SSL, but for simple App Service scenarios, the built-in capability is sufficient and directly integrated.
✗
Azure Key Vault only
Why it's wrong here
Key Vault stores certificates but App Service also needs custom domain configuration — Key Vault alone isn't sufficient.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Azure Front Door or Azure CDN as the service that adds custom domains and SSL to App Service, but those services are optional traffic optimizers—the core capability is always within App Service itself.
Trap categories for this question
Scenario analysis trap
Front Door can also provide custom domains and SSL, but for simple App Service scenarios, the built-in capability is sufficient and directly integrated.
Detailed technical explanation
How to think about this question
Under the hood, when you bind a custom domain to an App Service, Azure validates domain ownership via DNS TXT or CNAME records, then configures the App Service's front-end load balancer to accept requests for that domain. For SSL, you can upload a PFX certificate, use an App Service Managed Certificate (free, auto-renewed), or import from Key Vault; the binding creates a Server Name Indication (SNI) or IP-based SSL mapping that terminates TLS at the App Service, allowing the application to serve HTTPS traffic. A real-world scenario is a multi-tenant SaaS app where each tenant gets a custom subdomain (e.g., tenant1.contoso.com) with a separate SSL certificate, all managed within a single App Service plan.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure App Service custom domain and SSL binding — Azure App Service natively supports binding a custom domain to your web app and uploading or configuring an SSL/TLS certificate for HTTPS. This is done through the 'Custom domains' and 'TLS/SSL settings' blades in the portal, which directly associate the domain and certificate with the App Service resource, enabling secure access over HTTPS without additional services.
What should I do if I get this AZ-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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