Word:

Virtual Private Network

(networking, security)Virtual Private Network - (VPN) The use of encryption in the lower protocol layers to provide a secure connection through an otherwise insecure network, typically the Internet. VPNs are generally cheaper than real private networks using private lines but rely on having the same encryption system at both ends. The encryption may be performed by firewall software or possibly by routers.

Link-level (layer 2 and 3) encryption provides extra protection by encrypting all of each datagram except the link-level information. This prevents a listener from obtaining information about network structure. While link-level encryption prevents traffic analysis (a form of attack), it must encrypt/decrypt on every hop and every path.

Protocol-level encryption (layer 3 and 4) encryption encrypts protocol data but leaves protocol and link headers clear. While protocol-level encryption requires you to encrypt/decrypt data only once, and it encrypts/decrypts only those sessions that need it, headers are sent as clear text, allowing traffic analysis.

Application (layer 5 up) encryption is based on a particular application and requires that the application be modified to incorporate encryption.

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virtual image
Virtual LAN
Virtual Loadable Module
Virtual Local Area Network
Virtual Machine
Virtual Machine Environment
Virtual Machine/Conversational Monitor System
Virtual Machine/ESA
Virtual Machine/System Product
Virtual Machine/XA
virtual memory
Virtual Memory System
Virtual moment
virtual path
virtual point of presence
virtual PoP
-- Virtual Private Network --
virtual reality
Virtual Reality Modeling Language
Virtual Sequential Access Method
virtual server
virtual shredder
Virtual Software Factory
virtual storage
Virtual Storage Access Method
Virtual Storage Extended
Virtual Telecommunications Access Method
Virtual velocity
Virtual work
Virtuality
Virtually
Virtuate
Virtue
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