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Glossary
VTP
VLAN Trunk Protocol: Used to update
switches in a switch fabric about VLANs configured
on a VTP server. VTP devices can be a VTP server, cli-
ent, or transparent device. Servers update clients.
Transparent devices are only local devices and do not
share information with VTP clients. VTPs send VLAN
information down trunked links only.
WAN
wide area network: Is a designation used to
connect LANs together across a DCE (data communi-
cations equipment) network. Typically, a WAN is a
leased line or dial-up connection across a PSTN net-
work. Examples of WAN protocols include Frame
Relay, PPP, ISDN, and HDLC.
wildcard
Used with access-list, supernetting, and
OSPF configurations. Wildcards are designations used
to identify a range of subnets.
window size
The amount of data that a station can
transmit before needing an acknowledgment from the
destination system. The acknowledgment confirms
that all the data was received without error, or that
errors existed and part of the data will need to be
retransmitted.
windowing
Flow-control method used with TCP at
the Transport layer of the OSI model.
WinSock
Windows Socket Interface: A software
interface that makes it possible for an assortment of
applications to use and share an Internet connection.
The WinSock software consists of a Dynamic Link
Library (DLL) with supporting programs such as a
dialer program that initiates the connection.
workgroup switching
A switching method that
supplies high-speed (100Mbps) transparent bridging
between Ethernet networks as well as high-speed
translational bridging between Ethernet and CDDI or
FDDI.
X.25
An ITU-T packet-relay standard that defines
communication between DTE and DCE network
devices. X.25 uses a reliable Data-Link layer protocol
called LAPB. X.25 also uses PLP at the Network layer.
X.25 has mostly been replaced by Frame Relay.
ZIP
Zone Information Protocol: A Session-layer pro-
tocol used by AppleTalk to map network numbers to
zone names. NBP uses ZIP in the determination of net-
works containing nodes that belong to a zone. See
also: ZIP storm and zone.
ZIP storm
A broadcast storm occurring when a
router running AppleTalk reproduces or transmits a
route for which there is no corresponding zone name
at the time of execution. The route is then forwarded
by other routers downstream, thus causing a ZIP
storm. See also: broadcast storm and ZIP.
zone
A logical grouping of network devices in
AppleTalk. See also: ZIP.
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