CompTIA A+ Complete Practice Tests by Audrey O'Shea & Jeff T. Parker

Author:Audrey O'Shea & Jeff T. Parker [O'Shea, Audrey & Parker, Jeff T.]
Language: eng
Format: epub
ISBN: 9781119862659
Publisher: Wiley
Published: 2022-03-16T00:00:00+00:00

Chapter 4: Virtualization and Cloud Computing

B. Companies can purchase virtualization software to set up individual clouds within their own network. That type of setup is referred to as a private cloud. Running a private cloud pretty much eliminates many of the features that companies want from the cloud, such as rapid scalability, and eliminating the need to purchase and manage computer assets. The big advantage, though, is that it allows the company to control its own security within the cloud. A hybrid model would be the scenario providing benefits of both public and private clouds. The community model is something akin to a shared private cloud, with responsibilities and benefits collaboratively shared.

B. Let's say that your company needs extra network capacity, including processing power, storage, and networking services (such as firewalls), but doesn't have the money to buy more network hardware. Instead, your company can purchase infrastructure as a service (IaaS), which is a lot like paying for utilities; you pay for what you use. Of the four, IaaS requires the most network management expertise from the client side. In an IaaS setup, the client provides and manages the software. PaaS is platform as a service and SaaS is software as a service. FWaaS is sometimes used to mean firewall as a service, but is not widely recognized nor on the CompTIA A+ 220-1101 objectives.

A. The traditional type of cloud that usually comes to mind is a public cloud, like the ones operated by third-party companies such as Microsoft, Google, HP, Apple, Netflix, and Amazon with its Amazon Web Services (AWS). These clouds offer the best in scalability, reliability, flexibility, geographical independence, and cost effectiveness. Whatever the client wants, the client gets. For example, if the client needs more resources, it simply scales up and uses more.

C. Platform as a service (PaaS) adds a layer to IaaS that includes software development tools such as runtime environments. Because of this, it can be helpful to software developers; the vendor manages the various hardware platforms. This frees up the software developers to focus on building their application and scaling it. The best PaaS solutions allow for the client to export its developed programs and run them in an environment other than where they were developed.

D. The highest of the three levels of cloud service is software as a service (SaaS), which handles the task of managing software and its deployment. This is the model used by Google Docs, Microsoft Office 365, and even storage solutions such as Dropbox.

B. In most cases, clients can get more resources instantly (or at least quickly or on-demand), which is called rapid elasticity. For the client, this is a great feature because they can scale up without needing to purchase, install, and configure new hardware. Ubiquitous access refers to clients being able to access the cloud ubiquitously, or from anywhere, anytime. Resource pooling, particularly when a cloud provider deals with multiple tenants, refers to the provider effectively saving money by not duplicating available capacity. Finally, when the

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