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Certpedia: Terms That Start With V |
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# | 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
Virtual Memory - Also referred to as "swap space", Virtual Memory is free hard drive space that can be used as extra memory for a computer. Virtual memory is much slower than physical memory (RAM).
Virus - The most common computer infestation, viruses rely on other programs such as an email client to replicate themselves. There are many different brands of Anti-Virus software used to detect and eliminate viruses on computers. Virus definition files are what tell the anti-virus software what to look for and how to fix a particular virus if found. Because new viruses are being released all of the time, it is very important to keep the virus definition files up to date.
 VLAN (Virtual Local Area Network) - A VLAN is a logical grouping of devices or users. These devices or users can be grouped by function, department application and so on, regardless of their physical segment location. VLANs create separate broadcast domains in a switched network. Frame tagging at layer 2 does this. Frame tagging is a gaining recognition as the standard for implementing VLANs, and is recognized by IEEE 802.1q. Frame tagging uniquely assigns a VLAN ID to each frame. This identifier is understood and examined by each switch prior to any broadcasts or transmissions to other switches, routers, and end-stations devices.
VOIP (Voice Over Internet Protocol) - Also known as Internet Telephony, VOIP is the technology that allows voice traffic to be transmitted and routed over a data network using the Internet Protocol. The advantage of VOIP is that it is low cost (in some cases free) in comparison to using tradition POTS (Plain Old Telephone Systems) for voice communications. Companies such as Vonage and Comcast Cable are currently offering VOIP phone services and Skype is a freeware program that provides free long distance communications with other Skype users.
VPN (Virtual Private Network) - A VPN provides secure communications over public telecommunications infrastructures by utilizing encryption and a tunneling protocol such as PPTP and L2TP. A VPN is a virtual private network and is designed for situations where security is paramount such as allowing outsiders to connect to a corporate LAN.
VRAM - Video RAM. This type of memory is used on video adapters, and is dual-ported, meaning that it can be accessed by two devices simultaneously. This allows the monitor to access the memory for screen updates, while at the same time allowing the graphics processor to provide new data. VRAM is no longer to be found on new devices; it was rapidly superseded by SGRAM and then DDR-SDRAM.
VRML (Virtual Reality Modeling Language) - VRML allows the display of 3-D vector objects within a web browser with the installation of a plug-in. VRML is a text file format wherevertices and edges for a 3D polygon can be specified along with the surface color, image-mapped textures, shininess, transparency, and so on. VRML files are typically referred to as "worlds" and use the .wrl file extension.
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