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In each case, the remainder is the host address. In the Internet, assigned
network addresses are globally unique. See IP address.
Node An addressable device attached to a computer network. See host,
router.
P
Packet The unit of data sent across a network. "Packet" is a generic term
used to describe units of data at all levels of the protocol stack, but it is most
correctly used to describe application data units. See datagram, frame.
Policy Organization-level rules governing acceptable use of computing
resources, security practices, and operational procedures.
Port The abstraction used by Internet transport protocols to distinguish
among multiple simultaneous connections to a single destination host. A port
is a transport layer demultiplexing value. Each application has a unique port
number associated with it. It is also used to refer to one of the physical
network connectors on the router.
Protocol A formal description of message formats and the rules two
computers must follow to exchange those messages. Protocols can describe
low-level details of machine-to-machine interfaces (e.g., the order in which
bits and bytes are sent across a wire) or high-level exchanges between
allocation programs (e.g., the way in which two programs transfer a file
across the Internet).
Q
QOS Quality of Service. Transmission system qualities measure in terms of
reliability and availability.
R
Route The path that network traffic takes from the source to the destination.
It may include many gateways, routers, hosts and physical networks.
Route table A table listing information about routes to other hosts or
networks, such as the remote network or host address, the interface down
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