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What is the Cloud?

Home What is the Cloud?

Overview

Cloud computing refers to managing your applications and data through a remote IT infrastructure (i.e., within a datacenter), rather than from local servers, computers, and storage devices. The applications and data are accessed via a variety of devices—such as laptops, thin clients, tablets, smart phones, etc.—through a high-speed network such as the Internet, making them accessible virtually anytime and anywhere.

Models of Cloud computing

Generally speaking, there are three models of cloud computing:

1. Software as a Services (SaaS)
In this model, a services provider like Kodiak hosts your business and desktop applications within one or more datacenters and makes them available to your users via a high-speed network. Users access a Web page or custom application on a network-enabled device, enter a login name and password, and access each application over the network. Gmail, SalesForce, Workday, Concur, and GoToMeeting are all examples of popular hosted applications that use an SaaS model.
”2.
IaaS refers to the delivery of hardware or computing resources—such as server space, storage space, and network connections—over the Internet. Users can use this virtualized infrastructure to build their own IT platforms or services (e.g., website hosting).
3. Platform as a Services (PaaS)
PaaS describes a model of cloud computing that provides a remotely-accessible framework with which they can develop or customize applications. PaaS environments are useful for remote development teams, or for companies that seek to implement higher-level programming with dramatically reduced complexity.


Types of Clouds

There are three types of Clouds, each offering various levels of security and management:

1. Public Cloud
A public Cloud offers infrastructure and services off-site through the Internet. Although more vulnerable than a private Cloud, a public Cloud offers great efficiency and convenience for users.
”2.
A private Cloud offers infrastructure and services on a private network. This offers the greatest level of security and control, but do not offer the cost savings of a public Cloud.
3. Hybrid Cloud
A hybrid Cloud offers infastructure and services through a mix of public and private resources.


Architecture of Clouds

On the back end of the Cloud, data centers house the servers, data storage, and other equipment required to run the applications that users access remotely through virtualization technologies. If required, the data centers will also house the servers, hardware, and software used to back up the applications and data in the event of data loss or corruption. Data centers are generally security-protected, climate-controlled buildings that are protected from extreme weather events. In addition, they generally use raised floors, gas-based fire suppression methods, and employ multiple independent power supplies and distribution paths serving the IT equipment.

Between the back end and the front end (i.e., users), one or more servers monitors traffic and uses various transmission protocols to deliver data between the datacenters and the users. From there, the data reaches the front end of the Cloud, which is comprised of the users’ local networks, computers, tablets, smart phones, printers, etc. The data is generally fed to the users using encryption-based transmission methods and can be monitored using a portal or other simple web-based interface for accessing software and services.

Cloud diagram (Click to enlarge)


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