Which of the following descriptions about Paas is wrong? (Multiple choice)

Question

Options

• AEnd user can select operating system
• BEnd users can operate specified applications
• CEnd users can use the designated host
• DEnd-users can configure basic computing resources

• A
  83% (48)
• C
  17% (10)

Explanation

Options A, B, and D each describe capabilities that belong to other cloud service models, not PaaS. Selecting the operating system (A) is an IaaS feature, where users control the OS layer - PaaS abstracts the OS away entirely. Configuring basic computing resources such as CPU and RAM (D) is also IaaS behavior, since PaaS hides that infrastructure layer from the user. Operating "specified applications" provided by the vendor (B) describes SaaS, not PaaS - in PaaS, users deploy their own applications to the platform rather than using pre-built ones. Option C is the only correct description because PaaS does give end users access to a designated, provider-managed host on which they build and run their own applications.

Memory tip: Stack the three models as IaaS (control infrastructure and OS), PaaS (just bring your code), and SaaS (just use the app). Any answer choice that gives users OS control or resource tuning points to IaaS; any choice that hands users a ready-made application points to SaaS - neither belongs in a correct PaaS description.

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