Prestige 645 ADSL Internet Access Router

 

 

 

 

 

 

 

PAP

 

Password Authentication Protocol PAP is a security protocol that requires users to enter a

 

 

 

 

password before accessing a secure system. The user’s name and password are sent over the

 

 

 

 

wire to a server, where they are compared with a database of user account names and

 

 

 

 

passwords. This technique is vulnerable to wiretapping (eavesdropping) because the

 

 

 

 

password can be captured and used by someone to log onto the system.

 

 

 

 

 

 

 

Port

 

An Internet port refers to a number that is part of a URL, appearing after a colon (:) right

 

 

 

 

after the domain name. Every service on an Internet server listens on a particular port

 

 

 

 

number on that server. Most services have standard port numbers, e.g. Web servers normally

 

 

 

 

listen on port 80.

 

 

 

 

 

 

 

POTS

 

Plain Old Telephone Service is the analog telephone service that runs over copper twisted-

 

 

 

 

pair wires and is based on the original Bell telephone system. Twisted-pair wires connect

 

 

 

 

homes and businesses to a neighborhood central office. This is called the local loop. The

 

 

 

 

central office is connected to other central offices and long-distance facilities.

 

 

 

 

 

 

PPPPoint to Point Protocol. PPP encapsulates and transmits IP (Internet Protocol) datagrams over serial point-to-point links. PPP works with other protocols such as IPX (Internetwork Packet Exchange). The protocol is defined in IETF (Internet Engineering Task Force) RFC 1661 through 1663. PPP provides router-to-router, host-to-router, and host-to-host connections.

 

PPPoE

 

PPPoE (Point-to-Point Protocol over Ethernet) relies on two widely accepted standards: PPP

 

 

 

 

and Ethernet. PPPoE is a specification for connecting the users on an Ethernet to the Internet

 

 

 

 

through a common broadband medium, such as a single DSL line, wireless device or cable

 

 

 

 

modem. All the users over the Ethernet share a common connection, so the Ethernet

 

 

 

 

principles supporting multiple users in a LAN combine with the principles of PPP, which

 

 

 

 

apply to serial connections. From authentication, accounting and secure access to

 

 

 

 

configuration management, PPPoE supports a broad range of existing applications and

 

 

 

 

services.

 

 

 

 

 

 

 

PSTN

 

Public Switched Telephone Network was put into place many years ago as a voice telephone

 

 

 

 

call-switching system. The system transmits voice calls as analog signals across copper

 

 

 

 

twisted cables from homes and businesses to neighborhood COs (central offices); this is

 

 

 

 

often called the local loop. The PSTN is a circuit-switched system, meaning that an end-to-

 

 

 

 

end private circuit is established between caller and callee.

 

 

 

 

 

 

 

PVC

 

Permanent Virtual Circuit. A PVC is a logical point-to-point circuit between customer sites.

 

 

 

 

PVCs are low-delay circuits because routing decisions do not need to be made along the

 

 

 

 

way. Permanent means that the circuit is preprogrammed by the carrier as a path through the

 

 

 

 

network. It does not need to be set up or torn down for each session.

 

 

 

 

 

 

 

RFC

 

An RFC (Request for Comments) is an Internet formal document or standard that is the

 

 

 

 

result of committee drafting and subsequent review by interested parties. Some RFCs are

 

 

 

 

 

 

 

Glossary

 

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