VoIP (voice over IP)
VoIP (voice over IP) is the transmission of voice and multimedia content over Internet Protocol (IP) networks. VoIP is enabled by a group of technologies and methodologies used to deliver voice communications over the internet, enterprise local area networks or wide area networks.
VoIP historically referred to using IP to connect private branch exchanges (PBXs), but the term is now used interchangeable with IP telephony.
How does VoIP work?
VoIP encapsulates audio ...
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DMZ Definition
DMZ Definition
DMZ Definition: In computer networks, a DMZ (demilitarized zone) is a physical or logical sub-network that separates an internal local area network (LAN) from other untrusted networks, usually the Internet. External-facing servers, resources and services are located in the DMZ so they are accessible from the Internet but the rest of the internal LAN remains unreachable. This provides an additional layer of security to the LAN as it restricts the ability of hackers to directly...
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Data Center Definition
Data Center Definition
Data Center Definition: A data center (or datacenter) is a facility composed of networked computers and storage that businesses or other organizations use to organize, process, store and disseminate large amounts of data. A business typically relies heavily upon the applications, services and data contained within a data center, making it a focal point and critical asset for everyday operations.
Data centers are not a single thing, but rather, a conglomeration of e...
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Application Streaming
Application Streaming
Application streaming is an on-demand software delivery model that takes advantage of the fact that most applications require only a small fraction of their total program code to run.
Like progressive downloads in video or audio, application streaming is completely transparent to the end user. The server sends the client enough information to launch the application (usually as little as 10% of the application) and then streams the rest to the client in the backgroun...
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Host-based virtual machine
Host-based virtual machine
A host-based virtual machine is an instance of a desktop operating system that runs on a centralized server. Access and control is provided to the user by a client device connected over a network. Multiple host-based virtual machines can run on a single server.
With a host-based virtual machine, data is contained on the server, server resources can be allocated to users as needed, users can work from a variety of clients in different locations, and all of the v...
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Application Virtualization
Application Virtualization
App virtualization (application virtualization) is the separation of an installation of an application from the client computer that is accessing it. There are two types of application virtualization: remote and streaming.
Remote applications run on a server. End users view and interact with their applications over a network via a remote display protocol. The remote applications can be completely integrated with the user’s desktop so that they appear and behave...
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Desktop Virtualization
Desktop Virtualization
Desktop virtualization is the concept of isolating a logical operating system (OS) instance from the client that is used to access it.
There are several different conceptual models of desktop virtualization, which can broadly be divided into two categories based on whether or not the operating system instance is executed locally or remotely. It is important to note that not all forms of desktop virtualization involve the use of virtual machines (VMs).
Host-based...
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Data Virtualization
Data Virtualization
Data virtualization is an umbrella term used to describe any approach to data management that allows an application to retrieve and manipulate data without requiring technical details about the data, such as how it is formatted or where it is physically located.
You are probably familiar with the concept of data virtualization if you store photos on the social networking site Facebook. When you upload a photo to Facebook from your desktop computer, you must provide t...
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Server Virtualization
Server Virtualization
Server virtualization is the masking of server resources, including the number and identity of individual physical servers, processors, and operating systems, from server users. The server administrator uses a software application to divide one physical server into multiple isolated virtual environments. The virtual environments are sometimes called virtual private servers, but they are also known as guests, instances, containers or emulations.
There are three popul...
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Storage Virtualization Definition
Storage Virtualization Definition
Storage virtualization is the pooling of physical storage from multiple network storage devices into what appears to be a single storage device that is managed from a central console.
Storage virtualization helps the storage administrator perform the tasks of backup, archiving, and recovery more easily -- and in less time -- by disguising the actual complexity of a storage area network (SAN). Administrators can implement virtualization with software app...
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