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IP unnumbered
Cisco proprietary protocol that allows two point-to-
point links to communicate without an IP address.
Internetwork Packet Exchange: Network layer protocol (Layer 3) used
in Novell NetWare networks for transferring information from servers to
workstations. Similar to IP and XNS.
IPX Control Program: The protocol used to establish and configure
IPX over PPP. See also: IPX and PPP.
IPX spoofing
Provides IPX RIP/SAP traffic without requiring a connec-
tion to the opposing network. This allows a per-minute tariffed link, such as
ISDN or analog phone, to support IPX without requiring the link to remain
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.
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.
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.
International Telecommunication Union Telecommunication Stan-
dardization Sector: This is a group of engineers that develops worldwide
standards for telecommunications technologies.
Copyright ©2001 SYBEX , Inc., Alameda, CA