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Difficulty: MediumPlatform as a Service (PaaS)

A metropolitan transit agency is launching a real-time passenger tracking application. The development team is evaluating whether to host the application services on Azure using Platform as a Service (PaaS) or Infrastructure as a Service (IaaS) offerings.

Under the cloud shared responsibility model, which of the following statements correctly describe the responsibility boundaries for these two models? (Select two.)

  1. Under the PaaS model, Microsoft is responsible for upgrading the operating system and managing the database runtime environments.Answer
  2. Under the IaaS model, the transit agency is responsible for patching the guest operating system and configuring middleware.Answer
  3. C
    Under the IaaS model, Microsoft is responsible for installing database engine updates and configuring the application runtime.
  4. D
    Under the PaaS model, the transit agency is responsible for manually patching the operating system hosting the passenger tracking software.

Answer

The statements stating that under PaaS, Microsoft is responsible for upgrading the operating system and managing database runtimes, and under IaaS, the customer is responsible for patching the guest operating system and configuring middleware, are correct.
Under Platform as a Service (PaaS), the cloud provider is responsible for managing the physical infrastructure, virtualization layer, and guest operating system. Under Infrastructure as a Service (IaaS), the customer retains full control over the guest operating system, which includes responsibilities such as installing operating system patches, configuring middleware, and managing database engines.

Step-by-Step Solution

1
Analyze the Platform as a Service (PaaS) responsibility boundaries.
In PaaS, the cloud provider manages physical hosts, virtualization, operating systems, and middleware/runtimes. The customer only manages applications and data.
This determines that the statement about Microsoft managing the operating system and database runtimes in PaaS is correct, while the statement about the customer patching the OS in PaaS is incorrect.
2
Analyze the Infrastructure as a Service (IaaS) responsibility boundaries.
In IaaS, the cloud provider manages the physical hosts, storage, and virtualization. The customer is responsible for the guest operating system, database engines, middleware, and applications.
This determines that the statement about the customer patching the guest OS and configuring middleware in IaaS is correct, while the statement about Microsoft managing database engines in IaaS is incorrect.

Key Concept

The shared responsibility model defines which security and administrative tasks are handled by the cloud provider and which are handled by the customer, differing significantly between IaaS and PaaS.
Estimated Time:1m 30s
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Topics

Platform as a Service (PaaS)

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