Cloud Service Models Questions

Covers the three primary cloud service models and the responsibility boundaries for each: Infrastructure as a Service, Platform as a Service, and Software as a Service. Candidates should be able to define each model, explain which layers the cloud provider manages versus which layers the customer manages, and draw a responsibilities matrix across networking, virtualization, operating system, runtime, middleware, applications, and data. Provide concrete vendor examples for each model such as Amazon Web Services Elastic Compute Cloud, Microsoft Azure Virtual Machines, Google Cloud Platform Compute Engine for Infrastructure as a Service; Amazon Web Services Elastic Beanstalk, Microsoft Azure App Service, Google Cloud Platform App Engine for Platform as a Service; and Microsoft Office 365, Salesforce, and Google Workspace for Software as a Service. Be prepared to discuss trade offs when selecting a model including control and customization, operational overhead, time to market, scalability, cost model, security and compliance implications, and typical use cases where one model is preferred over the others. Interviewers may ask candidate to recommend a model given specific requirements and to justify that recommendation using the responsibilities and trade offs.