AWS CLF-C02 Cheat Sheets
Quick reference tables for exam preparation
📦S3 Storage Classes Comparison
| Storage Class | Use Case | Availability | Retrieval |
|---|---|---|---|
| S3 Standard | Frequently accessed data | 99.99% | Milliseconds |
| S3 Intelligent-Tiering | Unknown or changing access patterns | 99.9% | Milliseconds |
| S3 Standard-IA | Infrequently accessed data | 99.9% | Milliseconds |
| S3 One Zone-IA | Infrequent access, single AZ | 99.5% | Milliseconds |
| S3 Glacier Instant Retrieval | Archive with instant access | 99.9% | Milliseconds |
| S3 Glacier Flexible Retrieval | Archive data, 1-5 min retrieval | 99.99% | Minutes to hours |
| S3 Glacier Deep Archive | Long-term archive (7-10 years) | 99.99% | 12-48 hours |
💾EBS vs EFS Comparison
| Feature | EBS (Elastic Block Store) | EFS (Elastic File System) |
|---|---|---|
| Storage Type | Block storage | File storage (NFS) |
| Attachment | One EC2 instance at a time (except io2 multi-attach) | Thousands of EC2 instances concurrently |
| Availability | Single AZ | Multi-AZ (Regional) |
| Use Case | Boot volumes, databases, single instance storage | Shared file systems, content management, web serving |
| Performance | Fixed IOPS based on volume type | Scales automatically with file system size |
| Pricing | Pay for provisioned capacity | Pay for actual storage used |
| Backup | EBS Snapshots (point-in-time) | AWS Backup integration |
🆘AWS Support Plans Quick Reference
| Plan | Price | Response Time | Key Features |
|---|---|---|---|
| Basic | Free | N/A | Customer Service, documentation, forums |
| Developer | $29/month | 12-24 hours | Business hours email support, 1 primary contact |
| Business | $100/month | 1 hour (urgent) | 24/7 phone/chat/email, unlimited contacts, Trusted Advisor |
| Enterprise | $15,000/month | 15 min (critical) | TAM (Technical Account Manager), concierge support |
🖥️EC2 Instance Type Families
General Purpose (T, M)
Balanced compute, memory, networking. Web servers, code repositories.
Compute Optimized (C)
High-performance processors. Batch processing, gaming, HPC.
Memory Optimized (R, X)
Large datasets in memory. In-memory databases, real-time processing.
Storage Optimized (I, D, H)
High sequential read/write. Data warehouses, distributed file systems.
Accelerated Computing (P, G, F)
Hardware accelerators (GPU). ML, graphics, pattern matching.
🔐IAM Security Best Practices
✓
Enable MFA for Root Account
Always enable multi-factor authentication on the root user
✓
Follow Least Privilege Principle
Grant only the permissions required to perform a task
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Use IAM Roles for EC2
Never store credentials on EC2 instances, use IAM roles instead
✓
Rotate Credentials Regularly
Change passwords and access keys on a regular schedule
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Use Groups to Assign Permissions
Assign permissions to groups, then add users to groups