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Cloud computing

Preparing for the Microsoft Azure Fundamentals certification (AZ-900)

Preparation guide for the AZ-900: format, the three domains and their weightings, notions to master per domain, the Microsoft Learn path, a three-week study plan and common pitfalls.

1. The exam #

Format and domains.

Format #

ItemIndicative value
Questions40 to 60, various formats (multiple choice, drag and drop, yes/no)
Duration45 minutes
Passing score700 out of 1000
ValidityNo expiry (fundamentals certification)
AZ-900 domains
The official ranges: 25-30%, 35-40% and 30-35%.
To check: Indicative data: see the official exam page on Microsoft Learn.

2. To master #

Per domain.

Summary #

DomainNotions
Cloud conceptsIaaS, PaaS, SaaS, public/private/hybrid cloud, CapEx and OpEx, high availability, elasticity, serverless
Architecture and servicesRegions, zones, hierarchy (management groups to resources), VMs, App Service, containers, Functions, VNet, VPN, ExpressRoute, storage and redundancy, Entra ID, conditional access, Zero Trust
Management and governanceCost Management, calculators, tags, Azure Policy, locks, Purview, portal, CLI, ARM and Bicep, Azure Arc, Monitor, Advisor, Service Health

Plan #

  1. Week 1: concepts and global architecture.
  2. Week 2: services (compute, network, storage, identity).
  3. Week 3: governance and costs, then mock exams until you consistently score 80%.

3. Pitfalls #

The classic confusions.

To distinguish #

  • RBAC (who can act) and Azure Policy (what is allowed).
  • Availability zone and region pair.
  • Service Health (incidents affecting you) and Azure Status (global status).
  • ReadOnly lock (also blocks some read operations that write) and CanNotDelete.
  • Composite SLA: the product of the SLAs of components in series.

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