CLF-C02 Domain 1 - Cloud Concepts
Domain 1 is 24% of the scored AWS Certified Cloud Practitioner (CLF-C02) exam. It tests why organizations use the cloud, foundational design principles, migration value, and cloud economics.
1.1 Benefits of the AWS Cloud
- Agility: provision or change resources in minutes instead of waiting for procurement.
- Elasticity: add and remove capacity with demand; do not confuse it with scalability, which is the general ability to handle growth.
- High availability: design across independent Availability Zones so a single failure does not stop the workload.
- Global reach: deploy near users through Regions and edge locations.
- Pay for use: trade large fixed capital expenses for metered variable expenses.
- Managed services: shift undifferentiated infrastructure work to AWS while retaining the customer duties in the AWS Shared Responsibility Model.
1.2 AWS design principles
Use the six AWS Well-Architected Framework pillars: operational excellence, security, reliability, performance efficiency, cost optimization, and sustainability. AWS Well-Architected Tool records reviews; AWS Trusted Advisor generates environment-specific recommendations.
1.3 Migration
- AWS Cloud Adoption Framework (CAF) organizes transformation across Business, People, Governance, Platform, Security, and Operations perspectives.
- The seven common migration strategies are retire, retain, relocate, rehost, replatform, repurchase, and refactor/re-architect.
- Discover and assess with AWS Application Discovery Service and Migration Evaluator; plan/track with AWS Migration Hub or current AWS Transform workflows; rehost servers with AWS Application Migration Service; migrate data with AWS Database Migration Service (DMS) or AWS DataSync. AWS Snow Family is no longer on the in-scope list and is closed to new customers.
1.4 Cloud economics
- Variable vs fixed cost: pay for consumption rather than buying for peak capacity in advance.
- Economies of scale: AWS aggregates demand and can spread infrastructure cost across many customers.
- Rightsizing: match resource type and size to observed workload needs; use AWS Compute Optimizer and AWS Cost Explorer for evidence.
- Licensing: compare license-included pricing with Bring Your Own License; AWS License Manager helps track license use.
- Automation: repeatable provisioning with AWS CloudFormation reduces manual work and inconsistency.
Common traps
- Elasticity is demand-driven capacity change; high availability is continued service despite component failure.
- Multi-AZ improves availability inside a Region; multi-Region also addresses geography, sovereignty, and Regional disaster recovery.
- A managed service reduces customer operational responsibility but never removes responsibility for identities, data, and configuration.