AWS SAA-C03 Study Guide
Chapter 1: Introduction to Cloud Computing & AWS Global Infrastructure
Quick View: The Cloud Landscape
IaaS
Infrastructure as a Service
The “Building Blocks.” You manage OS and Apps. AWS manages Hardware.
PaaS
Platform as a Service
Focus on Code. AWS manages OS, Middleware, and Runtime.
SaaS
Software as a Service
Ready-to-use. You just use the software over the internet.
The “Pizza” Development Model
IaaS (The DIY Kitchen): You have the oven and gas, but you bring the dough, sauce, and toppings. You bake it yourself.
PaaS (The Delivery): You provide the recipe (code), but someone else uses their kitchen and tools to bring you the pizza.
SaaS (The Restaurant): You simply sit down and eat. Everything is prepared and managed for you.
Cloud Deployment Types
| Type | Description | Best For |
|---|---|---|
| Public Cloud | Resources owned/operated by 3rd party (AWS, Azure). | Scalability, Low upfront cost. |
| Private Cloud | Dedicated to one organization. | Strict compliance, high security. |
| Hybrid Cloud | Combines Public and Private. | Sensitive data on-prem; bursts to cloud. |
AWS Global Infrastructure
Regions vs. Availability Zones (AZs)
Region: A physical location in the world with multiple AZs (e.g., us-east-1).
Availability Zone (AZ): One or more discrete data centers with redundant power and networking.
Edge Locations
Global points of presence for caching content (CloudFront).
Local Zones
Places compute/storage closer to end-users for ultra-low latency.
SAA-C03 Exam Domains
The exam validates your ability to design solutions based on these four pillars:
The 5 Pillars of Architecting
- Operational Excellence: Running and monitoring systems.
- Security: Protecting information and systems.
- Reliability: Ensuring workloads perform intended functions.
- Performance Efficiency: Using resources effectively.
- Cost Optimization: Avoiding unnecessary costs.
AWS Account Basics
- Free Tier: New users can explore services for free within limits.
- Pay-as-you-go: No long-term contracts; pay only for what you consume.
- AWS Budgets: Set custom budgets that alert you when costs exceed thresholds.
- Cost Explorer: Visualize and manage your AWS spending over time.