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GLOSSARY 161
with periods (full-stops), and is made up of a network section, an
optional subnet section and a host section.
LAN Local Area Network. A network of client machines (such as PCs,
printers, servers) and network devices (hubs and switches) that cover a
relatively small geographic area (usually not larger than a floor or
building). LANs are characterized by high transmission speeds over
short distances (up to 1000 m).
LAN port An auto-negotiating 10BASE-T/100BASE-TX RJ-45 port which is used to
connect the Webcache to the network in either Proxy or Transparent
deployment environments.
latency The delay between a web request being issued from the Web browser
on a client machine and the information arriving back at the browser.
line speed See baud.
MRTG Multi Router Traffic Grapher. A graphing tool provided with the
Webcache that enables you to monitor the Webcache’s performance.
NTP Network Time Protocol. This protocol is used to synchronize the time of
client machines and servers with other well-known, highly accurate
servers or reference time sources (such as a radio, satellite receiver or
modem). It maintains a consistent Coordinated Universal Time (UTC)
within your network which is far more accurate than the internal
system clocks of client machines.
origin server The web server that contains the original copy of the requested
information.
PAC Proxy Auto Configuration. PAC files allow you to create configuration
rules that determine how Web browsers operate when the Webcache is
being deployed in a Proxy cache.
PING Packet Internet or Inter-Network Gropher. This feature allows you to
send out a PING request to test whether devices on an IP network are
accessible and functioning correctly.
protocol A set of rules for communication between devices on a network. The
rules dictate format, timing, sequencing and error control.