Garmin HM210DP/DI manual Packet, Port, PPPoE, Protocol

Glossary

Packet

Data transmitted on a network consists of units called packets. Each packet contains a payload (the data), plus overhead information such as where it came from (source address) and where it should go (destination address).

PAP

Short for Password Authentication Protocol, the most basic form of authentication, in which a user’s name and password are transmitted over a network and compared to a table of name-password pairs. Typically, the passwords stored in the table are encrypted.

PING

Short for Packet Internet (or Inter-Network) Groper. A program used to verify whether the host associated with an IP address is online. It can also be used to reveal the IP address for a given domain name.

Port

In TCP/IP and UDP networks, an endpoint to a logical connection. The port number identifies what type of port it is. For example, port 80 is used for HTTP traffic.

POTS

Short for Plain Old Telephone Service, which refers to the standard telephone service that most homes use. The POTS network is also called the Public Switched Telephone Network (PSTN).

PPP

Short for Point-to-PointProtocol. A protocol for serial data transmission that is used to carry IP (and other protocol) data between your ISP and your computer.

PPPoE

Acronym for Point-to-PointProtocol over Ethernet. PPPoE 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.

Protocol

A set of rules governing the transmission of data. In order for a data transmission to work, both ends of the connection have to follow the rules of the protocol.

PVC

Short for Permanent Virtual Circuit, which 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

124 EN/LZT 108 6492 R2 - October 2003