100 Azure Interview Questions & Answers
Azure interviews lean heavily on knowing which service to reach for and why — App Service vs. Functions, Blob vs. Table vs. Cosmos DB, Load Balancer vs. Application Gateway. This covers the full spread, organized by area, with diagrams for the structural stuff and a mock test at the end.
Azure Fundamentals
Q1. What are the core components of Microsoft Azure's architecture?
Azure's resource hierarchy, top to bottom
Management Group
Groups subscriptions for org-wide policy
Subscription
Billing boundary and access-control scope
Resource Group
A logical container for related resources
Resource
A VM, storage account, database, etc.
Every Azure resource lives inside this hierarchy — management groups organize multiple subscriptions under shared policy, a subscription is the billing/access boundary, resource groups bundle related resources (typically everything for one application) so they can be managed and deleted together, and the resources themselves are the actual services you provision.
Q2. Explain the difference between Infrastructure as a Service (IaaS) and Platform as a Service (PaaS).
| IaaS | PaaS | |
|---|---|---|
| You manage | OS, runtime, and everything above it | Just your application code and data |
| Azure manages | Physical hardware, virtualization | OS, runtime, patching, scaling infrastructure |
| Example | Azure Virtual Machines | Azure App Service, Azure Functions |
| Trade-off | Full control, more operational burden | Faster to ship, less control over the underlying stack |
Q3. What is Azure Resource Manager and how does it benefit Azure resource management?
az group create --name my-rg --location eastus
az vm create --resource-group my-rg --name my-vm --image UbuntuLTSAzure Resource Manager (ARM) is the deployment and management layer every Azure interaction goes through — the Portal, CLI, PowerShell, and SDKs all ultimately call the same ARM APIs. It provides consistent role-based access control, tagging, and — critically — declarative templates (ARM JSON or the newer Bicep syntax) so infrastructure can be deployed repeatably instead of clicked together by hand.
Q4. Describe the main categories of services offered by Azure.
- Compute — Virtual Machines, App Service, Azure Functions, AKS
- Storage — Blob, File, Table, Disk storage
- Databases — Azure SQL Database, Cosmos DB, PostgreSQL/MySQL managed services
- Networking — Virtual Network, Load Balancer, Application Gateway, ExpressRoute
- Identity & Security — Azure AD, Key Vault, Security Center
- DevOps & Management — Azure DevOps, Monitor, Automation
Q5. Explain the use of Azure regions and availability zones.
A region is a geographic area containing one or more datacenters; availability zones are physically separate datacenters within a region, each with independent power/cooling/networking. Deploying across zones protects against a single datacenter failure; deploying across regions protects against a regional-scale disaster, at the cost of higher latency between them.
Q6. How does Azure ensure data redundancy and failover?
| Replication option | Copies | Protects against |
|---|---|---|
| LRS (Locally Redundant Storage) | 3 copies, one datacenter | Hardware failure |
| ZRS (Zone Redundant Storage) | 3 copies across zones | A datacenter/zone outage |
| GRS (Geo-Redundant Storage) | 3 copies + 3 in a paired region | A regional disaster |
| RA-GRS | Same as GRS, plus read access to the secondary | Regional disaster, with read failover |
Q7. In what scenarios would you use Azure App Service Environment?
App Service Environment (ASE) is a dedicated, isolated deployment of App Service inside your own VNet — for apps needing network isolation, higher scale limits, or compliance requirements that shared multi-tenant App Service plans can't satisfy, at a meaningfully higher cost than the standard shared tiers.
Q8. What is the Azure Service Level Agreement (SLA) and how does it impact application design?
An SLA is Azure's contractual uptime guarantee for a given service (e.g. 99.95% for a single-instance VM, higher for multi-instance/zone-redundant configurations) — and it directly shapes architecture, since achieving a higher composite SLA than any single service offers usually requires redundancy across zones/regions, which the SLA numbers explicitly reward.
Q9. Describe the difference between Azure Classic and Azure Resource Manager deployment models.
| Classic (ASM) | Resource Manager (ARM) | |
|---|---|---|
| Status | Deprecated, retired | Current standard |
| Resource grouping | No concept of resource groups | Resources organized into resource groups |
| Deployment | No native templating | Declarative templates (ARM JSON / Bicep) |
Q10. Explain the concept of Azure Resource Groups.
A resource group is a logical container holding resources that share the same lifecycle — typically everything belonging to one application or environment, so they can be deployed, monitored, billed, and deleted together as a unit rather than tracked individually.
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