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AWS Certified Cloud Practitioner· Exam reference card · 2026 · Edureify AI
AWS Certified Cloud Practitioner

AWS Certified Cloud Practitioner Cheat Sheet

AWS Cloud Practitioner: Service Selection and Cloud Economics Are the Real Test

CLF-C02 is foundational but not trivial. The exam tests cloud concepts, AWS core services, pricing models, and the shared responsibility model — not technical implementation.

Check Your Readiness →
Among the harder certs
Avg: Approximately 68–72%
Pass: 750 / 1000
Most candidates understand AWS Certified Cloud Practitioner concepts — and still fail. This exam tests how you apply knowledge under pressure.
Core Framework

CLF-C02 Domain Framework

CLF-C02 has four domains. The most common failure points are the shared responsibility model (who is responsible for what) and pricing model selection (when to use On-Demand vs. Reserved vs. Spot). Every scenario has a 'most appropriate' answer based on these frameworks.

  1. 01
    Cloud Concepts — Benefits of cloud, types of cloud, cloud economics
  2. 02
    Security & Compliance — Shared responsibility model, IAM basics, compliance programs
  3. 03
    Cloud Technology — Core services: EC2, S3, RDS, Lambda, VPC, CloudFront
  4. 04
    Billing & Pricing — Pricing models, Cost Explorer, Trusted Advisor, support plans
Scenario Traps

Wrong instinct vs correct approach

A company has consistent, predictable compute needs for 2 years
✕ Wrong instinct

Use On-Demand instances for flexibility

✓ Correct approach

Reserved Instances provide up to 72% savings for predictable, steady-state workloads — On-Demand is more expensive and unnecessary when utilization is predictable

An application needs to process batch jobs that can tolerate interruption
✕ Wrong instinct

Use On-Demand instances for reliability

✓ Correct approach

Spot Instances are appropriate for fault-tolerant, interruptible batch workloads — they offer the lowest cost and the workload can handle unexpected interruptions

A startup wants to understand its potential AWS costs before migrating
✕ Wrong instinct

Create a free-tier account and estimate based on the console

✓ Correct approach

Use the AWS Pricing Calculator and TCO Calculator to estimate and compare on-premises vs. cloud costs before migration decisions

Quick Rules

Know these cold

  • ▸ Shared responsibility — WS secures the cloud; you secure what's in the cloud
  • ▸ On-Demand = unpredictable; Reserved = steady-state/predictable; Spot = interruptible/fault-tolerant
  • ▸ S3 = object storage; EBS = block storage (EC2-attached); EFS = managed file system
  • ▸ Lambda for event-driven/short-duration; EC2 for persistent/long-running
  • ▸ Global infrastructure — egions > Availability Zones > Edge Locations
  • ▸ IAM — sers for people, roles for services, policies define permissions
  • ▸ AWS Well-Architected Framework has 6 pillars — know all of them
Self Check

Can you answer these without checking your notes?

In this scenario: "A company has consistent, predictable compute needs for 2 years" — what should you do first?
Reserved Instances provide up to 72% savings for predictable, steady-state workloads — On-Demand is more expensive and unnecessary when utilization is predictable
In this scenario: "An application needs to process batch jobs that can tolerate interruption" — what should you do first?
Spot Instances are appropriate for fault-tolerant, interruptible batch workloads — they offer the lowest cost and the workload can handle unexpected interruptions
In this scenario: "A startup wants to understand its potential AWS costs before migrating" — what should you do first?
Use the AWS Pricing Calculator and TCO Calculator to estimate and compare on-premises vs. cloud costs before migration decisions
Failure Patterns

Common Exam Mistakes — What candidates get wrong

Misidentifying shared responsibility boundaries

AWS is responsible for the security of the cloud (hardware, network, hypervisor, managed services). Customers are responsible for security in the cloud (IAM, data, OS configuration, application). Mixing these up is the most common CLF failure.

Confusing AWS pricing models

On-Demand is for unpredictable workloads; Reserved Instances for steady-state, predictable workloads (1-3 year commitment); Spot Instances for fault-tolerant, interruptible workloads with up to 90% savings. Using Reserved for unpredictable or Spot for critical workloads is wrong.

Treating all storage services as interchangeable

S3 is object storage for files, backups, and static content. EBS is block storage attached to EC2. EFS is managed file storage for multiple instances. Each has different performance, cost, and use case characteristics.

Misidentifying when to use Lambda vs. EC2

Lambda is for short-duration event-driven processing (< 15 minutes). EC2 is for persistent, long-running workloads requiring custom configuration. Candidates apply EC2 when Lambda is more appropriate for cost and simplicity.

Underestimating the billing and pricing domain

CLF candidates often neglect Cost Explorer, AWS Budgets, and the Total Cost of Ownership (TCO) calculator. Pricing and billing questions account for 16% of the exam.

CLF-C02 covers more breadth than most candidates prepare for. Test whether your cloud fundamentals are solid.

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