Azure Compute and Application Hosting
Compute questions compare virtual machines, scale sets, availability sets, Azure Virtual Desktop, containers, functions, web apps, and hosting choices.
How to study for AZ-900
Treat each AZ-900 item as a cloud fit decision: identify the cloud model, Azure service category, responsibility boundary, governance need, or management tool.
Core concepts
Concept 1
Azure Compute and Application Hosting questions reward Azure service selection and responsibility reasoning rather than memorizing portal labels.
Exam cue: Identify whether the item is about cloud concepts, Azure services, or management and governance.
Concept 2
The best answer identifies the cloud model, Azure resource, management boundary, security control, or governance tool that matches the scenario.
Exam cue: Separate Microsoft responsibility from customer configuration and data responsibility.
Concept 3
Eliminate answers that confuse IaaS, PaaS, and SaaS responsibilities or use a monitoring, cost, or governance tool for the wrong job.
Exam cue: Match the Azure tool to the requested outcome: deploy, secure, govern, monitor, or optimize cost.
Risk pitfalls and guardrails
Assuming cloud always removes customer responsibility.
Guardrail: Avoid answers that remove all customer responsibility, use monitoring for pricing estimates, use tags for network security, or confuse Azure Policy with RBAC.
Choosing a named Azure service without checking whether the scenario asks for compute, networking, storage, identity, governance, or monitoring.
Guardrail: Avoid answers that remove all customer responsibility, use monitoring for pricing estimates, use tags for network security, or confuse Azure Policy with RBAC.
Confusing reactive monitoring dashboards with proactive cost alerts or policy enforcement.
Guardrail: Avoid answers that remove all customer responsibility, use monitoring for pricing estimates, use tags for network security, or confuse Azure Policy with RBAC.
Memory anchors
Azure Virtual Machine
An Azure virtual machine provides IaaS compute with customer control over the operating system.
VM Scale Set
A virtual machine scale set deploys and manages a group of load-balanced virtual machines.
Availability Set
An availability set spreads VMs across fault and update domains in a datacenter.
Azure Virtual Desktop
Azure Virtual Desktop provides cloud-hosted desktop and application virtualization.
Container
A container packages application code and dependencies for consistent deployment.
Azure Functions
Azure Functions runs event-driven serverless code.
App Service
Azure App Service hosts web apps and APIs as a managed platform.
Compute Choice
Compute choice depends on control, scaling, operating system access, and management burden.
Fault Domain
A fault domain groups resources that share physical failure points.
Update Domain
An update domain groups resources that may be rebooted together during maintenance.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Which Azure compute service provides customer-controlled guest operating systems?
A legacy application requires Windows administrator access. Which Azure hosting option is most suitable?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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