Glossary Of Terms

A	B	C	D	E	F	G	H	I	J
K	L	M	N	O	P	Q	R	S	T
		U	V	W	X	Y	Z

V

Virtualisation	Server virtualisation 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 popular approaches to server virtualisation: the virtual machine model, the paravirtual machine model, and virtualisation at the operating system (OS) layer.
Virtual Machine	Virtual machines are based on the host/guest paradigm. Each guest runs on a virtual imitation of the hardware layer. This approach allows the guest operating system to run without modifications. It also allows the administrator to create guests that use different operating systems. The guest has no knowledge of the host's operating system because it is not aware that it's not running on real hardware.
VoIP	VoIP (voice over IP) is an IP telephony term for a set of facilities used to manage the delivery of voice information over the Internet.VoIP involves sending voice information in digital form in discrete packets rather than by using the traditional circuit-committed protocols of the public switched telephone network (PSTN). A major advantage of VoIP and Internet telephony is that it avoids the tolls charged by ordinary telephone service.
VPN	A Virtual Private Network (VPN) is a secure, private tunnel between two or more devices across a public network such as the internet. A VPN device can be anything from a standard PC with VPN software installed on it to a dedicated hardware device called a VPN router.