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Copyright 2006 Ringdale User Manual, 62-15820000 Page 40
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PING -- Packet Internet Groper is a protocol primarily used to troubleshoot IP network
problems.
RARP -- (Reverse ARP) A TCP/IP protocol used by a diskless workstation to obtain its IP
address. Upon startup, the client station sends out a RARP request in an Ethernet frame to the
RARP server, which returns the layer 3 address for a layer 2 address (performing the opposite
function of an ARP).
RLE – Run Length Encoded is a simple form of compression. RLE consists of the process of
searching for repeated runs of a single symbol in an input stream, and replacing them by a
single instance of the symbol and a run count.
SMTP -- Simple Mail Transfer Protocol. Used for e-mail, port 25. SMTP gateways provide
access to TCP/IP e-mail services. SMTP is an Application layer protocol.
Subnet Mask – A subnet mask allows IP networks to be subdivided for security and
performance purposes.
Telnet – The Internet standard protocol for remote login. Runs on top of TCP/IP. Comes with
most Operating Systems.
TIFF - Acronym for Tagged Image File Format, one of the most widely supported file formats
for storing bit-mapped images on personal computers (both PCs and Macintosh computers).
TIFF graphics can be any resolution, and they can be black and white, gray-scaled, or color.
Files in TIFF format often end with a .tif extension. Common TIFF are TIFF-CCITT and TIFF-
RLE. Many TIFF viewers do not handle CCITT format correctly, but most seem to work fine
with RLE format.
Timeserver – A timeserver is a computer networking device that reads the actual time from
a reference clock and distributes this information to its clients using a computer network.
UDP -- User Datagram Protocol, uses best effort, no error-correction, and simple packets:
source address -- destination address -- length – checksum. UDP is carried in the Protocol
field of IP.
UT – Universal Time. This is the time kept on the Greenwich meridian (longitude
zero), five hours ahead of Eastern Standard Time.