1.1. Domain Overview: Describing Cloud Concepts

Describing cloud concepts begins with a fundamental First Principle: Cloud computing is the on-demand delivery of IT resources over the internet, fundamentally shifting technology from a product you own to a service you consume. This enables agility, scalability, and cost-effectiveness.

This domain explores the core ideas that define the cloud, including:

• Core Characteristics: High availability, scalability, reliability, and security.
• Key Benefits: Cost-effectiveness, global reach, and agility.
• Service Models (IaaS, PaaS, SaaS): The different levels of management and control.
• Deployment Models (Public, Private, Hybrid): Where and how cloud infrastructure is hosted.

The focus is on comprehending what the cloud is and why it has become the standard for modern IT infrastructure.

Scenario: A business leader asks you to explain the main advantages of using the cloud. You need to describe the core benefits and the different ways a company can adopt cloud services.

Reflection Question: How does understanding the different service and deployment models help a business choose the right cloud strategy to meet its specific needs for control, cost, and compliance?

💡 Tip: For the AZ-900, be able to clearly define and differentiate between IaaS, PaaS, and SaaS, and Public, Private, and Hybrid clouds. These are core conceptual questions.