AZ-900 Describe Azure architecture and services Practice Question
Which Azure service provides a way to create, test, and manage APIs, including rate limiting, authentication, and analytics?
⚠ Common exam trap
Many exam-takers confuse Azure API Management with Azure Functions, thinking that serverless functions inherently provide API management features, but Azure Functions only executes code and lacks built-in rate limiting, authentication, and analytics capabilities.
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
✓
Azure API Management
Azure API Management is a fully managed service that enables you to publish, secure, transform, maintain, and monitor APIs. It provides built-in capabilities for rate limiting (throttling), authentication (via OAuth 2.0, client certificates, or IP filtering), and analytics (through Azure Monitor and Application Insights), making it the correct choice for creating, testing, and managing APIs with these features.
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 Functions
Why it's wrong here
Azure Functions is a serverless compute service that executes event-driven code in response to triggers, such as HTTP requests. While you can expose HTTP-triggered functions as endpoints, Functions does not provide API management capabilities like rate limiting, authentication policies, or a developer portal. It handles code execution, not the governance of an API product.
- ✓
Azure API Management
Why this is correct
Azure API Management is a full-fledged API gateway that acts as a façade between consumers and backend services. It delivers out-of-the-box features including rate limiting and quotas, authentication and authorization, request/response transformation, analytics, and a customizable developer portal for API discovery and self-service. It supports versioning, publishing workflows, and lifecycle management, making it the correct choice for managing APIs at scale.
- ✗
Azure Application Gateway
Why it's wrong here
Azure Application Gateway is a layer-7 load balancer that distributes HTTP/HTTPS traffic to backend pools, with capabilities like SSL termination, URL-based routing, and a web application firewall. However, it lacks the API governance features required here, such as per-subscription rate limiting, developer portal, and full API lifecycle management. Its focus is on traffic optimization and protection, not on exposing APIs as managed products.
- ✗
Azure Service Bus
Why it's wrong here
Azure Service Bus is a fully managed enterprise message broker that decouples applications through queues and topics, supporting features like message ordering, sessions, and dead-lettering. It is designed for reliable asynchronous messaging, not for mediating HTTP API calls or applying API policies. It cannot provide a developer portal or enforce subscription-based rate limiting, so it is not an API management platform.
Go deeper
Related to this question
Learn chapter
Azure Regions and Geographies
Key term
Application Insights
Application Insights is an Azure monitoring service that helps developers detect, diagnose, and understand issues in live web applications by collecting telemetry data like requests, exceptions, and performance counters.
Key term
Managed service
A managed service is an IT offering where a third-party provider takes full responsibility for maintaining, monitoring, and supporting a specific technology or system on behalf of a customer.
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