Virtualization and Cloud Computing

Correct Answer: PaaS

The best cloud service model to use for testing and deploying a web application would be Platform as a Service (PaaS). This is because PaaS not only provides the infrastructure needed to host the application, but it also provides a platform and environment for developers to manage, develop, and test their applications. This eliminates the need for developers to handle or manage the underlying infrastructure of servers, storage, and networks, as they can focus on writing and maintaining the applications. In contrast, Infrastructure as a Service (IaaS) provides only the underlying infrastructures such as servers and storage, and the developer has to manage the platform and environment for development. Furthermore, Software as a Service (SaaS) would not be suitable as it does not enable the customization and control that a developer needs for application development, as it only provides access to software over the internet. Network as a Service (NaaS) is primarily concerned with providing network services over the internet and would not be appropriate for application development and deployment.

Correct Answer: Choose a cloud deployment model

When a small business plans to move their servers to the cloud, the first thing that they should consider is to choose an appropriate cloud deployment model. This is because the type of cloud deployment model (private, public, hybrid, or community cloud) will determine the level of security, scalability, and costs involved. Once they have decided on the appropriate model, they can then make decisions regarding other technical details like networking protocols. Implementing a new physical firewall or installing additional on-premise servers are not immediate considerations when moving to the cloud, as these are more relevant to an on-premise environment, not a cloud-based solution.

Correct Answer: DaaS

DaaS or Desktop as a Service is the most suitable option for deploying virtual desktops for remote employees. In this service model, the service provider manages the back-end responsibilities of data storage, backup, security, and upgrades. It allows users to access their virtual desktops from any location, making it an ideal choice for remote working scenarios. The other options provided, IaaS (Infrastructure as a Service), PaaS (Platform as a Service), and SaaS (Software as a Service), while they are cloud services, do not specialize in providing virtual desktops. IaaS offers computing infrastructure, PaaS provides platform to develop, run, and manage applications, and SaaS delivers software applications over the internet.