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modem
MRU
MTU
NAK
NCP
null modem
packet
PAP
parity
PING
Cayman 2E-H User's Guide
November 2000
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.
Modulator/demodulator. Device used to convert a digital signal to
an analog signal for transmission over standard telephone lines. A
modem at the other end of the connection converts the analog
signal back to a digital signal.
Maximum Receive Unit. The maximum packet size, in bytes, that a
network interface will accept.
Maximum Transmission Unit. The maximum packet size, in bytes,
that can be sent over a network interface.
Negative acknowledgment. See ACK.
Network Control Protocol.
Cable or connection device used to connect two computing devices
directly rather than over a network.
Logical grouping of information that includes a header and data.
Compare frame, datagram.
Password Authentication Protocol. Security protocol within the PPP
protocol suite that prevents unauthorized access to network
services. See RFC 1334 for PAP specifications. Compare CHAP.
Method of checking the integrity of each character received over a
communication channel.
Packet INternet Groper. Utility program that uses an ICMP echo
message and its reply to verify that one network node can reach
another. Often used to verify that two hosts can communicate over
a network.
Glossary
7
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