glossary
85
PPTP (Point-to-Point Tunneling Protocol)
Protocol allowing corporations to extend their corporate network over the
Internet through private “tunnels.” This has the effect of using the Internet as a
large private local area network known as a “virtual private network” or VPN.
print server
A hardware device that enables a printer to be connected directly to a network.
protocol
Network language allowing devices to communicate.
proxy server
Computer with software that controls user access to Internet services and
information.
ring topology
See token ring topology.
RIP (Routing Information Protocol)
Widely used protocol for routing traffic on the Internet.
RJ-11
4-wire phoneline cable connector.
RJ-45
8-wire twisted pair connector used for connecting Ethernet devices.
Roaming
Roaming allows a portable computer user to communicate continuously while
moving freely throughout an area greater than that covered by a single wireless
access point. Before using the roaming function, the computer must be set to the
same channel as the wireless access point for the coverage area.
router
Device or software connected to at least two networks that determines where a
data packet will next be forwarded on the Internet. Located at the gateway
where two networks meet. Often part of a network switch.
RTS/CTS (request-to-send/clear-to-send)
In exchanging data on a network, RTS is a signal sent from one computer or
other device requesting permission to send data to a receiving device; CTS is a
signal from the receiving computer or device indicating it is ready to receive the
data.
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