Revision 1.4
Port A software access point to a host. Hosts have multiple ports and
daemons typically listening to a specific port or ports for connection
from clients.
Port Scanning A technique of attempting to find listening TCP or UDP
ports on an IP device and abstracting from those ports as much infor-
mation as possible about the device and using the information for intru-
sion at a later date.
Protocol Stack A set of multiple, interrelated (stacked) software mod-
ules that forms a set of communication conversions. For example,
TCP/IP is a protocol consisting of many separate protocols including
TCP, UDP, IP, ICMP and others.
Proxy Server A proxy is an application running on a gateway that
relays packets between a trusted client and an untrusted host. It can pro-
vide additional features such as caching, Internet security, and IP
address consolidation.
Plug and Play A device that installs without the need for fiddling with
dip-switches, settings or interrupts and whereby the device is capable of
identifying itself and the resources it requires.
Physical Disconnect A type of disconnection that takes place at the
physical network layer effectively disabling all communication mes-
sages in both directions. Functionally, the circuit is electrically opened
and cannot establish a communication path due to no connection.
Remote LAN Access A data communication such as a corporate or
campus environment, in which the computer networks can be accessed
remotely via public telecommunication networks.
RJ-45 Standard eight-wire connectors used in IEEE 802.3 10Base-T
and 100Base-T networks.
Router A device that performs routing and appropriate paths for data
packets across networks as it traverses an internetwork or WAN.
Glossary Of Terms
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