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Difficulty: HardInfrastructure as a Service (IaaS)

A manufacturing company is migrating a legacy inventory control system to Azure. The system requires a specific third-party middleware wrapper that interacts directly with the local operating system's registry and filesystem. Additionally, the company's compliance policy dictates that they must manage the scheduling, testing, and installation of all operating system security patches. Which cloud service model and responsibility distribution should the company implement?

  1. A
    Infrastructure as a Service (IaaS) using Azure Virtual Machines, where Microsoft is responsible for managing the guest operating system patches
  2. Infrastructure as a Service (IaaS) using Azure Virtual Machines, where the company manages both the guest operating system patching and the middleware configurationAnswer
  3. C
    Platform as a Service (PaaS) using Azure App Service, where the company manages the guest operating system configuration and patching
  4. D
    Platform as a Service (PaaS) using Azure SQL Database, where Microsoft manages the database engine and the company patches the guest operating system

Answer

Infrastructure as a Service (IaaS) using Azure Virtual Machines, where the company manages both the guest operating system patching and the middleware configuration
The correct option is the one stating that the company should use Infrastructure as a Service (IaaS) with Azure Virtual Machines, where the company manages guest operating system patching and middleware configuration. This model grants the customer administrative access to the guest operating system, which is necessary to configure registry settings and filesystem wrappers. It also shifts the responsibility of operating system patching to the customer, satisfying the compliance requirement to control the patch lifecycle.

Step-by-Step Solution

1
Identify the level of control required for the software system's dependencies.
The legacy system requires direct access to the operating system's registry and filesystem to install a third-party middleware wrapper, indicating that a managed service (PaaS) that abstracts the OS will not work.
Access to the registry and filesystem at the OS level requires guest OS administrative control.
2
Determine the cloud service category that grants administrative access to the guest operating system.
Infrastructure as a Service (IaaS) is the model that provides virtualized computing resources, giving the customer administrative control over the guest OS.
Under the shared responsibility model, IaaS places the guest OS, middleware, and applications under the customer's management scope.
3
Analyze the responsibility for operating system patching.
Because the company's compliance policy mandates that they manage the patch schedules and installation, they must choose a service model where patching responsibility falls on the customer, which is IaaS.
In PaaS, Microsoft is responsible for OS patching, which would violate the company's requirement to manage it themselves.

Key Concept

Shared Responsibility Model in IaaS vs PaaS
Estimated Time:2m 0s
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Topics

Infrastructure as a Service (IaaS)

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