200 GLOSSARY
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PDV Path Delay Value. The maximum time between the first bit and
the last bit of the overlapping transmission of the two DTEs col-
liding across a path.
Physical Media The physical cabling used to connect two computers. Some
examples include fiber optic, coax, and twisted pair.
ping Command to test an IP connection.
pio file AIX spooling system configuration file.
PPP Point-to-Point Protocol. The successor to SLIP, PPP provides
router-to-router and host-to-network connections over synchro-
nous and asynchronous circuits.
pseudo-tty A UNIX facility for accessing network resources through stan-
dard UNIX device interfaces.
RARP Reverse Address Resolution Protocol. A mechanism for a net-
work device to discover its address dynamically when it boots.
rarpd daemon Server that responds to requests for address discovery.
repeater See Hub.
RFC Request For Comment. A set of documents that specify the Inter-
net protocols and provide other relevant information about the
Internet.
router A device that forwards Internet Protocol (IP) packets to their des-
tination.
rsh/rcmd/remsh Executes a command on a different host.
Runt Frame An Ethernet frame that is too short. A runt frame has fewer than
the 60 bytes in the data fields required. If the frame length is less
than 53 bytes, a runt frame indicates a normal collision. A frame
less than 60 bytes, but at least 53 bytes, indicates a late collision.
Runt frames are usually the result of a collision, a faulty device
on the network, or software gone awry.
SLIP Serial Line IP. A protocol used to connect two internet hosts
using a serial line.
SMIT program AIX device administration program.
SNMP Simple Network Management Protocol. A standard protocol used
