Port
A logical channel endpoint in a network. A computer might have only one physical channel (its Ethernet channel) but can have multiple ports (logical channels) each identified by a number.
PPP
PPPoE
PPTP
Preamble
Used to synchronize communication timing between devices on a network
Q
QoS
Quality of Service
R
RADIUS
Remote Authentication
Reboot
To restart a computer and reload it's operating software or firmware from nonvolatile storage.
Rendezvous
Apple's version of UPnP, which allows for devices on a network to discover each other and be connected without the need to configure any settings
Repeater
Retransmits the signal of an Access Point in order to extend it's coverage
RIP
Routing Information Protocol is used to synchronize the routing table of all the routers on a network
The most commonly used connection method for telephones
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