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System Architecture and Reliability

In an IaaS cloud service, which does the user generally manage?

  1. AThe data center buildings and the power and air-conditioning facilities
  2. BThe physical equipment such as servers and storage, and the virtualization platform
  3. CThe OS, middleware and applications running on the virtual machines
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Answer: C. The OS, middleware and applications running on the virtual machines

In IaaS (Infrastructure as a Service), the provider manages the buildings, facilities, physical equipment and virtualization platform, and the user manages everything from the OS on the virtual machines upward. In PaaS the provider also manages the OS and middleware and the user manages the applications and data, and in SaaS the provider manages up to the application and the user manages the data and usage settings. In this way, the scope of responsibility shared between the provider and the user changes with the service model.

  • A. In IaaS, the buildings and the power and air-conditioning facilities are managed by the provider.
  • B. In IaaS, the physical equipment and the virtualization platform are also managed by the provider.
  • C. Correct. From the OS upward, the user configures and updates things.
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