Cloud Concepts, Services, Security & Cost
A compact foundation review for AWS cloud learners. Study each service purpose first, then practice choosing the best service for a scenario.
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Resources adjust with changing demand.
Capacity grows to support workload needs.
Design reduces service disruption.
Consumption-based cloud economics can reduce large upfront infrastructure purchases.
Core AWS Services
EC2: virtual compute instances. S3: object storage. RDS: managed relational databases. Lambda: event-driven serverless compute. VPC: logically isolated networking environment. CloudFront: content delivery network. Route 53: DNS and routing service. CloudWatch: monitoring, metrics, logs and alarms.
Security Essentials
IAM manages identities and permissions. Apply least privilege so identities receive only required permissions. Enable MFA where appropriate. Under the shared responsibility model, AWS secures the underlying cloud infrastructure while customer responsibilities vary by service and include areas such as identities, data, configurations and workloads.
Regions & Availability Zones
A Region is a geographic AWS area. An Availability Zone is an isolated location within a Region. Architecting across multiple Availability Zones can improve resilience and availability.
Cost & Support Thinking
Match resources to actual requirements, monitor usage, remove unnecessary resources, and choose suitable pricing models. The AWS Pricing Calculator is used for estimates; AWS Cost Explorer helps analyze cost and usage patterns.
Exam habit: when several AWS services sound possible, identify the workload type first: compute, object storage, database, networking, identity, monitoring, DNS, or content delivery.
Mini Check
A company needs durable object storage for documents and images that applications can access through the cloud. Which core AWS service best fits?
Answer: Amazon S3. It is AWS object storage designed for storing and retrieving objects such as files and application assets.
Turn concepts into recall
Use CertNivo practice sessions to learn service selection from scenarios rather than memorizing names alone.
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