HP ProCurve 7000dl Series Basic Management And Configuration Manual page 869

Appendix B: Glossary
VCI Virtual Channel Identifier. A 16-bit field in an ATM cell's header that identifies
the cell's next destination. The VCI is similar to the DLCI in a Frame Relay
network.
VDSL Very high bit rate DSL. VDSL runs on fiber optic, providing extremely high-
speed WAN connections. VDSL is ideal for HDTV and supports data, video,
and voice transmissions simultaneously. VDSL can transmit data
symmetrically or asymmetrically.
VLAN Virtual Local Area Network. The IEEE 802.1Q standard enables you to group
users by logical function rather than by physical location. By creating VLANs
on switches, you can segment networks into smaller broadcast domains,
enhance network security, and simplify network management.
VP Virtual Path. In an ATM connection, the VP is a bundle of virtual channels that
have the same endpoint.
VPI Virtual Path Identifier. An eight-bit field in the ATM header that identifies the
virtual path through an ATM network to which the packet belongs.
VPN Virtual Private Network. A virtual point-to-point connection that transfers
data over the public telecommunication infrastructure while maintaining
privacy through the use of a tunneling protocol and security procedures. A
VPN has comparable security with a system of owned or leased lines that can
only be used by one company. For more information about VPNs, see RFC
2764 (at http://www.ietf.org/rfc/rfc2764.txt). See also IPSec.
VRRP Virtual Router Redundancy Protocol. VRRP is a protocol that allows routers to
work together to ensure hosts always have a default gateway. Instead of
designating a single default gateway router, VRRP defines a group of routers as
one "virtual router," which acts as the default gateway to the hosts. The group
of routers are set up in a hierarchy where a subordinate router may take over
as master router in the event of a master router failure. For more information
about VRRP, see RFC 3768 (at http://www.ietf.org/rfc/rfc3768.txt).
V.35 An ITU standard for high-speed synchronous data exchange. In the United
States and Canada, V.35 is the interface standard most public carriers use to
connect routers to a standalone CSU/DSU.
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