site_logo

Next Next


  1. A+ Core 1 Practice Tests
  2. A+ Lab Simulator
  3. A+ LabSim w/ ExamSim
  4. A+ Cram Notes

A+ Certification Exam Notes : Virtualization and Cloud Computing

Brief review of Virtualization and Cloud Computing

Virtualization and cloud computing are two closely related technologies that have transformed the way organizations manage and use IT resources.

Virtualization refers to the creation of a virtual version of a computing resource, such as a server, storage device, or network, which can be accessed and managed as if it were a physical device. By abstracting the underlying hardware, virtualization enables multiple virtual resources to share the same physical infrastructure, providing greater flexibility, scalability, and cost efficiency. Virtualization technologies include hypervisors, which manage and allocate physical resources to virtual machines, and containers, which enable the creation and management of lightweight, isolated environments for running applications.

Cloud computing, on the other hand, refers to the delivery of computing services, such as servers, storage, and applications, over the internet. Cloud computing is based on a pay-per-use model, where customers can access computing resources on-demand, without the need for upfront investment in hardware or infrastructure. Cloud computing can be divided into three main categories: Infrastructure as a Service (IaaS), which provides virtualized computing resources over the internet; Platform as a Service (PaaS), which provides a complete platform for developing, testing, and deploying applications; and Software as a Service (SaaS), which delivers applications over the internet.

Virtualization and cloud computing have become essential technologies for businesses of all sizes, providing greater flexibility, agility, and cost savings. They enable organizations to optimize their IT infrastructure, improve resource utilization, and accelerate the deployment of new applications and services. However, virtualization and cloud computing also present new challenges, such as security, compliance, and performance management, which must be carefully addressed to ensure their successful adoption and implementation.

4.1 Summarize the following cloud-computing concepts

Cloud computing refers to the delivery of on-demand computing resources over the internet. The common cloud models are private cloud, public cloud, hybrid cloud, and community cloud.

Common cloud models

Private cloud is a cloud infrastructure that is operated solely for a single organization.

Public cloud is a cloud infrastructure that is available to the public over the internet. Hybrid cloud is a combination of public and private cloud infrastructures.

Community cloud is a cloud infrastructure that is shared among several organizations with similar computing requirements.

Infrastructure as a service (IaaS) is a cloud computing model where a third-party provider hosts infrastructure components such as servers, storage, and networking hardware.

Software as a service (SaaS) is a cloud computing model where a third-party provider hosts software applications and makes them available to customers over the internet.

Platform as a service (PaaS) is a cloud computing model where a third-party provider hosts hardware and software tools that developers use to build, test, and deploy applications.

Cloud characteristics

Cloud computing is a model for enabling on-demand network access to a shared pool of configurable computing resources. The following are some characteristics of cloud computing:

1. Shared Resources: Cloud computing resources, such as servers, storage, and applications, are shared by multiple users, allowing them to use what they need when they need it.

2. Metered Utilization: Users only pay for the amount of resources they use, similar to a utility bill. This can help companies save money by only paying for the resources they use.

3. Rapid Elasticity: Cloud resources can be easily scaled up or down depending on demand. This makes it easy to respond to changes in traffic or demand.

4. High Availability: Cloud computing services are designed to be highly available, so users can access them when needed. This means that there is little or no downtime.

5. File Synchronization: Cloud storage services allow users to synchronize files across devices, making it easy to access files from anywhere. This can be useful for teams working remotely or for people who work from multiple devices.

Desktop virtualization

Desktop virtualization refers to the practice of running a desktop operating system on a virtual machine that is hosted on a remote server. This allows users to access their desktop environment from anywhere with an internet connection. Two common types of desktop virtualization are Virtual Desktop Infrastructure (VDI) on premises and VDI in the cloud.

VDI on premises refers to the deployment of VDI technology on the organization's own servers and infrastructure, usually within the company's data center. This allows for greater control over the hardware and software used, but also requires more maintenance and upfront costs.

VDI in the cloud, on the other hand, involves using a cloud service provider to host the virtual machines and infrastructure. This offers greater flexibility and scalability, as well as a more predictable pricing model, but may come with concerns about data security and vendor lock-in.


Next Next



simulationexams.com ad

certexams.com ad