Core AWS services for the CLF-C02 exam: compute, storage, databases, networking, security, and pricing — in one glanceable reference.
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EC2
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Virtual servers; you manage the OS — resizable, pay-as-you-go
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Lambda
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Serverless functions — run code with zero servers, pay per execution
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Elastic Beanstalk
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PaaS — deploy apps without managing infrastructure
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Auto Scaling
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Adds/removes EC2 instances based on demand
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ELB (ALB/NLB)
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Distributes traffic across instances; ALB = HTTP, NLB = TCP/UDP
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S3
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Object storage — 11 nines durability; classes: Standard, Intelligent-Tiering, Glacier
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S3 Glacier
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Archive storage — cheapest, retrieval in minutes to hours
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EBS
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Block storage for EC2 (like a virtual hard drive)
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EFS
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Shared file storage for multiple EC2 instances
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Storage Gateway
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Hybrid — connects on-premises storage to AWS
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RDS
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Managed relational DB (MySQL, Postgres, Oracle, SQL Server)
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Aurora
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AWS-built relational DB — MySQL/Postgres compatible, high performance
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DynamoDB
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Serverless NoSQL key-value — single-digit millisecond latency
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Redshift
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Data warehouse for analytics
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ElastiCache
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In-memory caching (Redis/Memcached)
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VPC
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Your isolated virtual network in AWS
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Subnets
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Public (internet-facing) vs private (no direct internet)
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Security Groups
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Stateful instance-level firewall (allow rules only)
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NACLs
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Stateless subnet-level firewall (allow + deny rules)
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Route 53
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DNS service; IGW | Internet Gateway — lets public subnets reach the internet
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CloudFront
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CDN — caches content at edge locations worldwide
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Direct Connect
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Dedicated private link from on-premises to AWS
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IAM
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Users, groups, roles, policies — least privilege, MFA on root
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Shared Responsibility
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AWS secures OF the cloud; you secure IN the cloud
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KMS
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Key Management Service — encryption keys
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CloudTrail
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Logs API calls (who did what)
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CloudWatch
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Metrics, alarms, and logs monitoring
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GuardDuty / Inspector
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Threat detection / vulnerability assessments
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WAF / Shield
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Web app firewall / DDoS protection
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On-Demand
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Pay per second, no commitment — most flexible, most expensive
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Reserved Instances / Savings Plans
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1- or 3-year commitment for big discounts
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Spot Instances
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Bid on spare capacity — up to 90% off, can be reclaimed
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CAF
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Cloud Adoption Framework — 6 perspectives for migration planning
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Support plans
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Basic (free) → Developer → Business → Enterprise On-Ramp → Enterprise
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Pricing Calculator / Cost Explorer / Budgets
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Estimate, analyze, and alert on spend
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📘 Exam-ready? Get the AWS Cloud Practitioner (CLF-C02) Study Guide — $5 at bytebarhq.com
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Free IT certification study resources at bytebarhq.com
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