BinTec RS120 Reference Manual page 544

Glossary
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L2TP The Layer 2 Tunneling Protocol (L2TP) is a network protocol for en-
capsulating other protocols so that they can be transported via the
Internet Protocol (IP) in the form of a tunnel (VPN). By default, L2TP
uses protocol number 1701. The architecture in an L2TP network
consists of an L2TP access concentrator (LAC) which may also be
permanently integrated into the client, and the L2TP network server
(LNS). The LAC establishes the connections to the LNS and man-
ages them. The authorisation is regulated using a network access
server (NAS), which can be implemented in the LAC or LNS. The
LNS is responsible for routing and controlling the packets received
from the LAC. The user data itself is exchanged unencrypted, while
control messages for maintaining the accessibility of the tunnel end-
points are transmitted securely.
LAC See L2TP.
LAN A Local Area Network (LAN) refers to a network that is geographic-
ally very limited and normally spans one building or a company head
office.
Layer A layer refers to a layer in the OSI model.
LCP The Link Control Protocol (LCP) is used in PPP connections to auto-
matically negotiate encapsulation, process limits for varying packet
sizes, authenticate the connection partner, determine faulty links,
identify connection faults and terminate the connection.
LDAP The Lightweight Directory Access Protocol (LDAP) regulates the
communication between a client and the directory server. LDAP is
used for sharing and updating directories, e. g. a phone book.
Lease time The lease time refers to the validity period of a dynamic IP address
that a client has been given by a DHCP server.
Leased line See Leased line
Leased line A leased line is a permanent connection of two communication part-
ners via telecommunications network.
LLC The Link Layer Control (LLC) regulates the media allocation at MAC
level.
LNS See L2TP.
Load balancing With load balancing, data is sent via different interfaces in order to
increase the overall bandwidth available. In contrast to Multilink,
load balancing also functions with accounts with different providers.
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