Lesson 2: IaaS, PaaS, SaaS & FaaS

Knowledge

Stack: IaaS (lowest) → PaaS → SaaS (highest). EC2 / App Engine / Gmail+Salesforce. FaaS = serverless event functions.

Practice (14 questions)

MCQ 1: IaaS example?

Gmail Google App Engine Amazon EC2 Salesforce

MCQ 2: Least infrastructure control?

IaaS PaaS SaaS All equal

MCQ 3: Abstraction levels correctly described?

IaaS highest; SaaS lowest SaaS highest; IaaS lowest PaaS lowest; IaaS highest All same level

MCQ 4: In IaaS user controls:

Physical servers OS and deployed apps Provider backbone Data center cooling

MCQ 5: FaaS is:

Users manage own servers Desktop delivery service Serverless event-driven functions Container management only

MCQ 6: PaaS example?

Amazon EC2 Google App Engine Gmail KVM

T/F: Gmail is an example of PaaS.

T/F: PaaS users control underlying servers.

Fill: SaaS example: (email)

Fill: IaaS = Infrastructure as a

Essay: Compare IaaS, PaaS, and SaaS.

IaaS (lowest abstraction) gives VMs/storage — user manages OS/apps (EC2). PaaS gives dev platforms — user manages apps only (App Engine). SaaS (highest) delivers ready apps — user manages almost nothing (Gmail, Salesforce). More abstraction = less control but more convenience.

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