L2tp) – Motorola SURFBOARD SVG2500 User Manual
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17 GLOSSARY
148
TERM DEFINITION
ISAKMP
Internet Security Association and Key Management Protocol
ISDN
Integrated Services Digital Network
ISO
The International Organization for Standardization
is a worldwide federation of national
standards bodies from approximately 140 countries. ISO is a non-
governmental organization established in 1947 to promote the
development of standardization and related activities in the world
with a view to facilitating the international exchange of goods and
services, and to developing cooperation in the spheres of
intellectual, scientific, technological, and economic activity.
ISP
Internet Service Provider
ITU
International Telecommunications Union
K
TERM DEFINITION
kHz
kilohertz — one thousand cycles per second
L
TERM DEFINITION
L2F
Layer 2 Forwarding is an OSI layer 2 protocol that establishes a
secure tunnel across the Internet to create a virtual PPP
connection between the user and the enterprise network.
L2F is the most established and stable layer 2 tunneling
protocol.
L2TP
Layer 2 Tunnel Protocol is a PPP extension that enables ISPs to
operate VPNs. L2TP merges the best features of the PPTP and
L2F. L2TP is the emerging IETF standard.
LAC
An L2TP access concentrator is a device to which the client
directly connects. PPP frames are tunneled through the LAC
to the LNS. The LAC need only implement the media over
which L2TP operates to transmit traffic to one or more LNSs.
The LAC may tunnel any protocol carried within PPP. The LAC
initiates incoming calls and receives outgoing calls. A LAC is
analogous to an L2F NAS.
LAN
A local area network provides a full-time, high-bandwidth
connection over a limited area, such as a building or campus.
Ethernet is the most widely used LAN standard.
layer
In networks, layers are software protocol levels. Each layer
performs functions for the layers above it. OSI is a reference
model having seven functional layers.