Which cloud computing service model provides the user with the highest level of control over the operating systems, applications, and network?

Question

Options

• ASoftware as a Service (SaaS)
• BPlatform as a Service (PaaS)
• CInfrastructure as a Service (IaaS)
• DFunction as a Service (FaaS)

• A
  4% (2)
• B
  8% (4)
• C
  87% (46)
• D
  2% (1)

Explanation

IaaS gives users the most control because it provides raw compute, storage, and networking resources - you manage the OS, middleware, runtime, and applications, while the cloud provider only handles the physical hardware and virtualization layer.

Why the distractors are wrong:

• SaaS (A) is the opposite extreme - you only control your data and user settings; the provider manages everything else (e.g., Gmail, Salesforce).
• PaaS (B) sits in the middle - you control your application code and data, but the OS and runtime are managed for you (e.g., Heroku, Google App Engine).
• FaaS (D) offers the least control of all - you only provide a single function's code and the provider handles every layer beneath it (e.g., AWS Lambda).

Memory tip: Think of it as a stack - the lower you go (IaaS → PaaS → SaaS/FaaS), the less you control. "I" in IaaS = I control everything (below the hardware).

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