Glossary
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IPXWAN
Protocol used for new WAN links to provide and negotiate line
options on the link using IPX. After the link is up and the options have been
agreed upon by the two end-to-end links, normal IPX transmission begins.
IRDP
ICMP Router Discovery Protocol: Allows hosts to use the Internet
Control Message Protocol (ICMP) to find a new path when the primary
router becomes unavailable. IRDP is an extension to the ICMP protocol and
not a dynamic routing protocol. This ICMP extension allows routers to
advertise default routes to end stations.
ISDN
Integrated Services Digital Network: Offered as a service by tele-
phone companies, a communication protocol that allows telephone net-
works to carry data, voice, and other digital traffic. See also: BISDN, BRI,
and PRI.
ISL routing
Inter-Switch Link routing is a Cisco proprietary method of
frame tagging in a switched internetwork. Frame tagging is a way to identify
the VLAN membership of a frame as it traverses a switched internetwork.
isochronous transmission
Asynchronous data transfer over a synchro-
nous data link, requiring a constant bit rate for reliable transport. Compare
with: asynchronous transmission and synchronous transmission.
ITU-T
International Telecommunication Union Telecommunication Stan-
dardization Sector: This is a group of engineers that develops worldwide
standards for telecommunications technologies.
LAN
local area network: Broadly, any network linking two or more com-
puters and related devices within a limited geographical area (up to a few
kilometers). LANs are typically high-speed, low-error networks within a
company. Cabling and signaling at the physical and data link layers of the
OSI are dictated by LAN standards. Ethernet, FDDI, and Token Ring are
among the most popular LAN technologies. Compare with: MAN.
LANE
LAN emulation: The technology that allows an ATM network to
operate as a LAN backbone. To do so, the ATM network is required to pro-
vide multicast and broadcast support, address mapping (MAC-to-ATM),
SVC management, in addition to an operable packet format. Additionally,
LANE defines Ethernet and Token Ring ELANs. See also: ELAN.
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