Nortel 400, Using Manual

Page: 326 / 344

326 Glossary
300868-G
port
A 16-bit identifier that transport protocols use to distinguish between multiple
destinations within a given host computer endpoint.
POTS
Plain Old Telephone Service. The standard phone service that most homes
use.
PPP
Point-to-Point Protocol. Protocol between the terminal and the router. A
communications protocol that provides dial-up access to the Internet.
PPPoE
Point-to-Point Protocol over Ethernet. A type of Internet connection that
enables you to select from a variety of different Internet service providers in
Ethernet-like environments, for example, a cable modem, xDSL, or wireless
environment.
proxy server
A server that acts on behalf of another.
protocol
A formal set of rules developed by international standards bodies, LAN
equipment vendors, or groups governing the format, control, and timing of
network communications.
provider
An Internet Service Provider that offers Internet access and services to its
customers. Access can be provided through dial-up, ISDN, or leased-lines
(T1, DDS, V.35, or X.21). Services include mail, newsreader servers, and ftp
and Web servers maintained on behalf of clients.
raw socket
A type of socket, distinct from TCP or UDP, which provides features required
by certain diagnostics such as “ping” and “trace route.” These programs
require special low-level control of the IP packets, so some administrators
may want to restrict user access to these diagnostics.