Practice EC2, S3, Lambda, and cloud architecture with real AWS scenarios
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Learn Well-Architected Framework and design patterns
Understand IAM, VPC, security groups, and compliance
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EC2, S3, and core compute/storage
Lambda and serverless architecture
VPC, subnets, and networking
IAM roles and security policies
RDS and database services
CloudFormation and infrastructure as code
A: EC2: virtual servers you manage (OS, scaling, patching). Lambda: serverless functions, AWS manages infrastructure, pay per execution. ECS: container orchestration using Docker, you manage cluster or use Fargate (serverless). Use EC2 for full control, Lambda for event-driven apps, ECS for containerized apps.
A: Versioning keeps multiple variants of an object. When enabled, S3 assigns version IDs. Deletes create delete markers instead of permanent deletion. Lifecycle policies automate transitions: move to Glacier after 30 days, delete after 365. Saves costs by moving data through storage classes based on access patterns.
A: IAM (Identity and Access Management) controls access to AWS resources. Best practices: use roles over users for services, grant minimum permissions needed, use groups for users, enable MFA, rotate credentials. Policies define permissions in JSON. Follow least privilege: start with nothing, add only what's needed.
A: VPC is isolated network in AWS. Subnets divide VPC (public/private). Public subnets have internet gateway access. Security groups are stateful firewalls controlling inbound/outbound traffic. Network ACLs are stateless subnet-level firewalls. Route tables direct traffic. Use private subnets for databases, public for web servers.
Understand AWS Well-Architected Framework's five pillars
Master IAM policies, roles, and permission boundaries
Know when to use S3, EBS, and EFS for storage
Practice designing VPC architecture with public/private subnets
Understand CloudFormation or Terraform for infrastructure as code
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