Filter
Top Products
Terminology
This section explains terms that are commonly used in this document.
Term Meaning
ADSL 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.
BOOTP 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.
DHCP Dynamic Host Configuration Protocol. A communications protocol
that assigns IP addresses to computers when they are connected to
the network.
DNS 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.
DUN Dial Up Networking.
Ethernet A physical layer protocol based upon IEEE standards.
Extranet 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.
Failover 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.
Fall-forward A method for shutting down the failover connection when the main
Internet connection can be re-established.
Firewall 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.
Gateway A machine that provides a route (or pathway) to the outside world.
Hub A network device that allows more than one computer to be
connected as a LAN, usually using UTP cabling.
IDB 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.
Internet A worldwide system of computer networks - a public, cooperative,
and sel
f
-sustainin
g
network of networks accessible to hundreds of
Introduction
2