between segments of data links, usually referred to
specifically as an Ethernet switch. LAN switches trans-
fer traffic based on MAC addresses. Multilayer
switches are a type of high-speed, special-purpose,
hardware-based router. See also: multilayer switch,
and store-and-forward packet switching.
X.25 stack and has its origin in SDLC. See also:
SDLC and X.25.
the D channel and defined by ITU-T Recommenda-
tions Q.920 and Q.921. LAPD evolved from LAPB
and is created to comply with the signaling require-
ments of ISDN basic access.
ing contexts, it can mean either (1) the time elapsed
(delay) between the execution of a request for access to
a network by a device and the time the mechanism
actually is permitted transmission, or (2) the time
elapsed between when a mechanism receives a frame
and the time that frame is forwarded out of the desti-
nation port.
straight-through pin configuration connects the termi-
nal end point (TE) to the network termination (NT).
architecture allows the application developer to
make changes in only one layer instead of the whole
program.
for use by PPP. See also: PPP.
conformance of cell flows from a user or network. The
at which cells can be accommodated, and the "depth" is
the tolerance for cell bursts over a certain time period.
faces associated with each address. Transparent
bridges help to reduce traffic congestion on the net-
work.
responds to a MAC address.
operation and communication of all higher-level pro-
tocols and applications to continue. The LEC client
runs in all ATM devices, which include hosts, servers,
bridges, and routers. The LANE client is responsible
for address resolution, data transfer, address caching,
interfacing to the emulated LAN, and driver support
for higher-level services. See also: ELAN and LES.
the configuration data that is furnished upon request
from the LES. These services include address registra-
tion for Integrated Local Management Interface
(ILMI) support, configuration support for the LES
addresses and their corresponding emulated LAN
identifiers, and an interface to the emulated LAN. See
also: LES and ELAN.
for each connecting LEC. The LES typically is located
on either an ATM-integrated router or a switch.
Responsibilities of the LES include configuration and
support for the LEC, address registration for the LEC,
database storage and response concerning ATM
addresses, and interfacing to the emulated LAN. See
also: ELAN, LEC, and LECS.
mation regarding the cost of reaching all its neighbors to
every node in the internetwork. Link-state algorithms