Cloud Service Types and Serverless
Service-type questions compare IaaS, PaaS, SaaS, serverless, management responsibility, and appropriate use cases for each model.
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
Cloud Service Types and Serverless 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
IaaS
Infrastructure as a service provides virtualized compute, storage, and networking that customers configure and manage.
PaaS
Platform as a service provides a managed application platform so customers focus more on code and data.
SaaS
Software as a service delivers a complete application managed mostly by the provider.
Serverless
Serverless lets code or workflows run without customers managing server infrastructure.
Virtual Machine
A virtual machine is an IaaS compute resource with customer-managed operating system responsibility.
App Platform
An app platform hosts applications while reducing infrastructure management tasks.
Managed Database
A managed database reduces administrative work such as patching or platform maintenance.
Responsibility Shift
Responsibility generally shifts toward the provider as services move from IaaS to PaaS to SaaS.
Use Case Fit
Service model fit depends on control needs, operational burden, and application requirements.
Cloud-Native
Cloud-native designs use managed services, automation, scalability, and resilience patterns.
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 service type gives the customer the most control over the guest operating system?
Which service type is designed for deploying application code without managing the underlying operating system?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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