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Terminology
This section explains terms that are commonly used in this document.
Term
ADSL
BOOTP
DHCP
DNS
DUN
Ethernet
Extranet
Failover
Fall-forward
Firewall
Gateway
Hub
IDB
Internet
Introduction
Meaning
Asymmetric Digital Subscriber Line. A technology allowing high-
speed data transfer over existing telephone lines. ADSL supports
data rates between 1.5 and 9 Mb/s when receiving data and between
16 and 640 Kb/s when sending data.
Bootstrap Protocol. A protocol that allows a network user to
automatically receive an IP address and have an operating system
boot without user interaction. BOOTP is the basis for the more
advanced DHCP.
Dynamic Host Configuration Protocol. A communications protocol
that assigns IP addresses to computers when they are connected to
the network.
Domain Name System that allocates Internet domain names and
translates them into IP addresses. A domain name is a meaningful
and easy to remember name for an IP address.
Dial Up Networking.
A physical layer protocol based upon IEEE standards.
A private network that uses the public Internet to securely share
business information and operations with suppliers, vendors,
partners, customers, or other businesses. Extranets add external
parties to a company's intranet.
A method for detecting that the main Internet connection (usually a
broadband connection) has failed and the SnapGear apliance cannot
communicate with the Internet. If this occurs, the SnapGear appliance
automatically moves to a lower speed, secondary Internet
connection.
A method for shutting down the failover connection when the main
Internet connection can be re-established.
A network gateway device that protects a private network from users
on other networks. A firewall is usually installed to allow users on an
intranet access to the public Internet without allowing public Internet
users access to the intranet.
A machine that provides a route (or pathway) to the outside world.
A network device that allows more than one computer to be
connected as a LAN, usually using UTP cabling.
Intruder Detection and Blocking. A feature of your SnapGear VPN
appliance that detects connection attempts from intruders and can
also optionally block all further connection attempts from the
intruder's machine.
A worldwide system of computer networks - a public, cooperative,
and self-sustaining network of networks accessible to hundreds of
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