ZyXEL Communications 964 manual Pots, Ppp, Pptp, Pstn, Pvc, Rfc

	Prestige 964 Cable Router
Port (H/W)	An interface on a computer for connecting peripherals or devices to the computer. A printer port,
	for example, is an interface that is designed to have a printer connected to it. Ports can be defined
	by specific hardware (such as a keyboard port) or through software.
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.
PPP	Point 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.
PPTP	Point-to-Point Tunneling Protocol.
Promiscuous Packet	Actively capturing packet information from a network. Most computers only collect packets
Capture	specifically addressed to them. Promiscuous packet capture acquires all network traffic it can
	regardless of where the packets are addressed.
Protocol	A “language” for communicating on a network. Protocols are sets of standards or rules used to
	define, format, and transmit data across a network. There are many different protocols used on
	networks. For example, most web pages are transmitted using the HTTP protocol.

Proxy Server

PSTN

Public Key

Encryption

PVC

Ranging

Reconnaissance

RFC

A server that performs network operations in lieu of other systems on the network. Proxy Servers are most often used as part of a firewall to mask the identity of users inside a corporate network yet still provide access to the Internet. When a user connects to a proxy server, via a web browser or other networked application, he submits commands to the proxy server. The server then submits those same commands to the Internet, yet without revealing any information about the system that originally requested the information. Proxy servers are an ideal way to also have all users on a corporate network channel through one point for all external communications. Proxy servers can be configured to block certain kinds of connections and stop some hacks.

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.

System of encrypting electronic files using a key pair. The key pair contains a public key used during encryption, and a corresponding private key used during decryption.

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.

The process of automatically adjusting transmission levels and time offsets of individual modems in order to make sure the bursts coming from different modems line up in the right timeslots and are received at the same power level at the CMTS.

The finding and observation of potential targets for a cracker to attack.

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 informational in nature. Of those that are intended to become Internet standards, the final version of the RFC

Glossary K