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Glossary
Glossary-14 PortMaster Configuration Guide
G
gateway
A device that connects two or more networks that use different protocols. Gateways
provide address translation services, but do not translate data. Gateways must be used in
conjunction with special software packages that allow computers to use networking
protocols not originally designed for them.
graphical user interface
See GUI.
GUI
Graphical user interface. A software interface based on pictorial representations and
menus of operations and files.
H
hardwired
A continuous connection between two sites. A port on a PortMaster that is configured for
hardwired use cannot be simultaneously used for any other type of connection.
hello
Protocol used by OSPF routers to acquire neighbors and to synchronize their topological
databases.
high-water mark
The number of bytes of queued network traffic required to open an additional dial-out
line to a remote location.
hop
The transmission of a data packet between two network nodes—for example, between
two routers.
hop count
Measurement of the distance between a source and destination that is used as a metric to
compare routes. If a packet traverses six routers between source and destination nodes,
the hop count for the packet will be 6 when it arrives at its destination node.