Which of the following cloud delivery models has the most limitations for user access to the underlying infrastructure?

Question

Options

• APaaS
• BSaaS
• CIaaS
• DDBaaS

• A
  4% (2)
• B
  84% (41)
• C
  2% (1)
• D
  10% (5)

Explanation

SaaS (Software as a Service) imposes the most restrictions on infrastructure access because users interact only with the finished application - they have no visibility or control over the OS, runtime, middleware, storage, or networking beneath it. Think Gmail or Salesforce: you use it, but you touch nothing underneath.

Why the distractors are wrong:

• A (PaaS): Users still can't access raw hardware, but they do control application code and sometimes runtime configurations - more access than SaaS.
• C (IaaS): Users manage virtual machines, networking, and storage - the most infrastructure access of any cloud model.
• D (DBaaS): A subset of PaaS; users control database configuration, schemas, and data - more granular access than a full SaaS product.

Memory tip: Think of the stack from top to bottom - SaaS → PaaS → IaaS - as moving from most locked down to most open. SaaS sits at the top (furthest from the metal), so it has the fewest infrastructure controls. The more letters in the acronym before "aaS," the more abstracted and restricted your infrastructure access becomes.

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