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Comprehensive study notes covering all Azure Fundamentals exam domains with detailed explanations, tables, and exam tips.
| Capital Expenditure (CapEx) | Operational Expenditure (OpEx) |
|---|---|
| Upfront investment in physical infrastructure | Pay for services as you use them |
| Depreciated over time | Deducted in same billing period |
| Requires accurate forecasting | Flexible, adjust as needs change |
| High initial cost | Lower initial cost |
| You own the infrastructure | Provider owns infrastructure |
| Model | Description | You Manage | Provider Manages | Azure Examples |
|---|---|---|---|---|
| IaaS | Infrastructure as a Service | OS, runtime, apps, data | Hardware, networking, virtualization | VMs, VNets, Storage |
| PaaS | Platform as a Service | Apps and data only | Everything else including OS | App Service, Azure SQL, Functions |
| SaaS | Software as a Service | Just use the application | Everything | Microsoft 365, Dynamics 365 |
| Model | Description | Advantages | Disadvantages |
|---|---|---|---|
| Public Cloud | Services offered over public internet, owned by cloud provider | No CapEx, agility, pay-as-you-go, no maintenance | Less control, security concerns, compliance challenges |
| Private Cloud | Computing resources used exclusively by one organization | More control, customization, legacy support | CapEx required, limited scalability, maintenance burden |
| Hybrid Cloud | Combines public and private clouds | Flexibility, compliance options, gradual migration | Complexity, integration challenges, cost management |
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