Motorola 3347 - Manual (Page 325)

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-----L-----
LCP. Link Control Protocol. Protocol responsible for negotiating
connection configuration parameters, authenticating peers on
the link, determining whether a link is functioning properly, and
terminating the link. Documented in RFC 1331.
LQM Link Quality Monitoring. Optional facility that lets PPP
make policy decisions based on the obser ved quality of the link
between peers. Documented in RFC 1333.
loopback test. Diagnostic procedure in which data is sent from
a devices's output channel and directed back to its input chan-
nel so that what was sent can be compared to what was
received.
-----M-----
magic number. Random number generated by a router and
included in packets it sends to other routers. If the router
receives a packet with the same magic number it is using, the
router sends and receives packets with new random numbers
to determine if it is talking to itself.
MD5. A 128-bit, message-digest, authentication algorithm used
to create digital signatures. It computes a secure, irreversible,
cr yptographically strong hash value for a document. Less
secure than variant SHA-1.
metric. Distance, measured in the number of routers a packet
must traverse, that a packet must travel to go from a router to a
remote network. A route with a low metric is considered more
efficient, and therefore preferable, to a route with a high metric.
See hop count.