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AWS Cloud Basics

Key AWS services and cloud computing concepts for the AWS Cloud Practitioner certification.

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What is EC2?
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Elastic Compute Cloud — virtual servers in the cloud. Choose instance type (CPU, RAM), OS, and storage. Pay for what you use. Scalable up/down.
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What is S3?
Last reviewed 12 days ago
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Simple Storage Service — object storage with 99.999999999% (11 nines) durability. Store any amount of data. Use for backups, static hosting, data lakes.
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What is the difference between IaaS, PaaS, and SaaS?
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IaaS: infrastructure (EC2, VMs). PaaS: platform (Elastic Beanstalk, Heroku). SaaS: software (Gmail, Slack). More abstraction = less control but less management.
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What is Lambda?
Fading — due 5 days ago
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Serverless compute — run code without provisioning servers. Triggered by events (API calls, S3 uploads, schedules). Pay per invocation and duration. Max 15 min runtime.
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What is a VPC?
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Virtual Private Cloud — your isolated network in AWS. Control subnets, route tables, internet gateways, and security groups. Foundation for secure architecture.
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What is RDS?
Last reviewed 21 days ago
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Relational Database Service — managed databases (MySQL, PostgreSQL, etc.). AWS handles backups, patching, scaling, and replication. Multi-AZ for high availability.
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What is IAM?
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Identity and Access Management — controls who can do what in AWS. Users, groups, roles, and policies. Principle of least privilege: give minimum necessary permissions.
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What is CloudFront?
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AWS CDN (Content Delivery Network). Caches content at edge locations worldwide for low-latency delivery. Used for static assets, APIs, and streaming.
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