Technical data

Logical Link Control
The upper portion of the Data Link layer that presents a uniform interface to the
user of the data link service, usually the Internet layer.
loop node
A local node that is associated with a particular address and is treated as if it were
a remote node. All traffic to the loop node is sent over the associated address;
used for loopback testing.
loopback
A program that sends packets to a remote host on the Internet and looks for
replies; works by means of the echoing facility provided by the ICMP protocol
and is a way to determine if an Internet host is reachable from your host. See
also packet internet groper.
LPR/LPD
See remote line printing or line printer daemon.
mail bridge
A mail gateway that forwards electronic mail between two or more networks while
ensuring that the messages it forwards meet certain administrative criteria;
specialized form of mail gateway that enforces an administrative policy with
regard to what mail it forwards.
Mail Exchange record (MX record)
The Domain Name System resource record type indicating which host can handle
mail for a particular domain or host.
Mail exchange (MX)
The Compaq TCP/IP Services for OpenVMS implementation of a mail exchanger
that allows hosts in a local network to forward mail to systems that might not be
directly connected to the local network.
mail exploder
The part of an electronic mail delivery system that allows a message to be
delivered to a list of addressees. Users send messages to one address (e.g.,
[e-mail]) and the mail exploder handles delivery to the individual
mailboxes.
mail gateway
A host that connects two or more electronic mail systems (especially dissimilar
mail systems on two different networks) and transfers messages between them.
mail path
A series of hosts used to direct electronic mail from one user to another.
Management Information Base (MIB)
A database used by the Simple Network Management Protocol (SNMP) to check
network statistics and configurations. An SNMP management station can query a
MIB or set it in an SNMP agent (for example, router). Standard, minimal MIBs
have been defined (MIB I, MIB II), and vendors often have custom entries. In
theory, any SNMP manager can talk to any SNMP agent with a properly defined
MIB.
Management Information Base II (MIB-II)
Data that can be accessed by a network management protocol; for, the database
maintained by a gateway running SNMP.
management station
The workstation of a network manager running SNMP.
Glossary–25