User`s guide

Glossary Cayman 3220-H User’s Guide
6 December 2000
hop A unit for measuring the number of routers a packet has passed
through when traveling from one network to another.
hop count Distance, measured in the number of routers to be traversed, from
a local router to a remote network. See metric.
hub Another name for a repeater.
interface A connection between two devices or networks.
internet address IP address. A 32-bit address used to route packets on a TCP/IP
network. In dotted decimal notation, each eight bits of the 32-bit
number are presented as a decimal number, with the four octets
separated by periods.
IPCP Internet Protocol Control Protocol. A network control protocol in
PPP specifying how IP communications will be configured and
operated over a PPP link.
ISDN Integrated Services Digital Network. A digital network with circuit
and packet switching for voice and data communications at data
rates up to 1.544 or 2.048 Mbps over telephone networks.
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
observed 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 channel so that what was
sent can be compared to what was received.
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.