Page 248 Glossary 90030500B
PAP
Password Authentication Protocol. A method of authenti-
cating a connection request on a PPP port. See also
CHAP
.
Ping
A message sent to test the reachability of a network device.
Also (as a verb), to send a message to a device and wait for
an acknowledgment.
Port
An interface on PortServer II that is associated with a serial
connector.
PPP
Point-to-Point Protocol. See
RFC1331
for more informa-
tion.
PSTN
Public Service Telephone Network.
PVC
Permanent Virtual Circuit. Used in Frame Relay networks
to provide a logical connections between two points.
RADIUS
Remote Authentication Dial In User Service. A security
authentication protocol developed by Livingston Corp.
RARP
Reverse Address Resolution Protocol. A method by which
a network device such as PortServer II can “learn” its IP
address from a server.
RealPort
A Digital International protocol that allows a host to con-
trol the operation of serial ports on a device such as PortS-
erver II.
RFC
A
Request for Comment
document on a specific network-
ing topic. Refer to the note at the end of this Glossary for
details of how to obtain RFCs.
RIP
Routing Information Protocol. See
RFC1058
for more
information.
RJ-11, RJ-45
Standard North American pattern telephone and data con-
nectors.
Rlogin
A method of logging on to a remote system via another
computer. Generally available on UNIX systems.
RS-232C
A physical interface standard, also referred to as
V24
.
RTTY
Software that allows a pseudo-TTY to act as a serial
device, permitting the use of CU and UUCP.
SLIP
Serial Line Internet Protocol. A protocol employed on dial-
in or dial-out connections.
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