GL-21
Cisco Router and Security Device Manager 2.5 User’s Guide
OL-4015-12
Glossary
LEFS low-end file system.
life cycle See expiration date.
LLQ Low Latency Queuing (LLQ) allows delay-sensitive data such as voice to be
dequeued and sent first (before packets in other queues are dequeued), giving
delay-sensitive data preferential treatment over other traffic.
LNS L2TP network server. Device able to terminate L2TP tunnels from a LAC and
able to terminate PPP sessions to remote systems through L2TP data sessions.
local subnet Subnetworks are IP networks arbitrarily segmented by a network administrator
(by means of a subnet mask) in order to provide a multilevel, hierarchical routing
structure while shielding the subnetwork from the addressing complexity of
attached networks. The local subnet is the subnet ass ociated with your end of a
transmission.
logical interface An interface that has been created solely by configuration, and that is not a
physical interface on the router. Dialer interfaces and tunnel interfaces are
examples of logical interfaces.
loopback In a loopback test, signals are sent and then redirected back toward their source
from some point along the communications path. Loopback tests are often used
to determine network interface usability.
M
MAC message authentication code. The cryptographic checksum of the me ssage used
to verify message authenticity. See hash.