AWS CLF-C02 glossary of cloud basics, security, billing terms, traps, and decision cues.
Use this glossary when foundational AWS terms start to blur together. Keep it beside the cheat sheet and resources rather than treating it as a substitute for studying.
| Term | Short meaning | Why it matters on CLF-C02 |
|---|---|---|
| Availability Zone | Isolated location inside an AWS Region used for resilience | Core HA and resilience concept |
| CAPEX | Up-front capital spending model common in on-premises environments | Part of cloud-economics comparisons |
| OPEX | Ongoing operational spending model common in cloud consumption | Cloud cost model contrast with CAPEX |
| Edge location | AWS point of presence used by edge and content-delivery services | Helps separate global edge services from Regions and AZs |
| Elasticity | Ability to grow or shrink capacity quickly | Core cloud benefit tested repeatedly |
| High availability | Design approach that keeps service available despite failures | Often contrasted with elasticity and fault tolerance |
| IaaS | Infrastructure as a Service; customer manages more of the stack | Foundational service-model classification |
| PaaS | Platform as a Service; provider manages more of the runtime platform | Helps compare managed levels |
| SaaS | Software as a Service; provider manages the finished application | High-level cloud model |
| Region | Geographic AWS boundary containing multiple Availability Zones | Core global infrastructure concept |
| Reserved pricing | Discounted pricing model based on longer commitment | Common pricing distractor |
| Scalability | Ability to handle more work by growing capacity | Frequently confused with elasticity |
| Shared responsibility model | Security split between AWS and the customer | One of the most tested CLF ideas |
| Support plan | AWS service tier for guidance, response targets, and tooling | Common business-fit question lane |
| Total cost of ownership | Broader cost comparison, not just raw resource price | Strong cloud economics concept |
| Fault tolerance | Design that can keep operating through failure with less interruption | Commonly confused with high availability |
| On-Demand pricing | Pay for compute or services without long commitment | Baseline pricing model |
| Spot pricing | Discounted spare capacity with interruption risk | Core pricing comparison concept |
| AWS Artifact | AWS source for compliance reports and agreements | High-yield compliance answer |
| AWS Budgets | Tool for spend thresholds and alerts | Frequently tested cost-control tool |
| Pair | Keep this distinction clear |
|---|---|
| elasticity vs scalability | fast adjustment versus broader capacity growth |
| high availability vs fault tolerance | reduced downtime versus surviving failure with stronger continuity |
| Region vs Availability Zone | geography boundary versus isolated location inside that boundary |
| pricing model vs support plan | how you pay for resources versus what support service you receive |
| IaaS vs PaaS vs SaaS | more customer management versus less |
| CAPEX vs OPEX | up-front spend versus ongoing usage-based spend |
| Budgets vs Cost Explorer | alerts and thresholds versus cost analysis and exploration |
| Artifact vs Audit Manager | downloaded compliance evidence versus audit-workflow support |
| Cluster | Fast separation |
|---|---|
| Region / Availability Zone / edge location | geography boundary, isolated facility group, or edge presence |
| scalability / elasticity / high availability | more capacity, faster capacity adjustment, or resilience through failure |
| pricing / billing / support | how you pay, how you track the bill, or what help tier you have |
| IaaS / PaaS / SaaS | more customer management, less customer management, or finished software |
| IAM / compliance / logging | access control, standards/evidence, or activity visibility |
| Cluster | What it usually signals on the exam |
|---|---|
| cloud value / CAPEX / OPEX / TCO | business-value and economics questions |
| Region / AZ / edge location | infrastructure and resilience questions |
| IAM / shared responsibility / compliance evidence | foundational security and governance questions |
| On-Demand / Reserved / Spot | pricing model selection |
| Support plans / Trusted Advisor / Account Manager features | support and business-fit questions |
| Topic family | Best page to revisit |
|---|---|
| service-family recognition | Cheat Sheet |
| exam-day format or study pacing | FAQ or Study Plan |
| current AWS facts, policies, or official prep links | Resources |
| broad exam framing | Guide root |