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Glossary
Connection : A link between machines, applications, processes, etc. that can be logical, physical,
or both.
DMZ, Demilitarized Zone : Used to host Internet services without allowing unauthorized access
to an internal (private) network. Typically, the DMZ contains servers accessible to Internet traffic,
such as Web (HTTP) servers, FTP servers, SMTP (e-mail) servers and DNS servers.
DMZ interface : The DFL-1000 interface that is connected to your servers that are accessible
from the Internet.
DNS, Domain Name Service : A service that converts symbolic node names to IP addresses.
Ethernet : A local-area network (LAN) architecture that uses a bus or star topology and supports
data transfer rates of 10 Mbps. Ethernet is one of the most widely implemented LAN standards. A
newer version of Ethernet, called 100Base-T (or Fast Ethernet), supports data transfer rates of
100 Mbps. And the newest version, Gigabit Ethernet supports data rates of 1 gigabit (1,000
megabits) per second.
External interface : The DFL-1000 interface that is connected to the Internet.
FTP, File transfer Protocol : An application and TCP/IP protocol used to upload or download
files.
Gateway : A combination of hardware and software that links two different types of networks.
Gateways between TCP/IP networks, for example, can link different subnetworks.
HTTP, Hyper Text Transfer Protocol : The protocol used by the World Wide Web. HTTP
defines how messages are formatted and transmitted, and what actions Web servers and
browsers should take in response to various commands.
HTTPS : The SSL protocol for transmitting private documents over the Internet using a Web
browser.
Internal interface : The DFL-1000 interface that is connected to your internal (private) network.
Internet : A collection of networks connected together that span the entire globe using the
NFSNET as their backbone. As a generic term, it refers to any collection of interdependent
networks.
ICMP, Internet Control Message Protocol : Part of the Internet Protocol (IP) that allows for the
generation of error messages, test packets, and information message relating to IP. This is the
protocol used by the ping function when sending ICMP Echo Requests to a network host.
IKE, Internet Key Exchange : A method of automatically exchanging keys between two secure
servers.
IMAP, Internet Message Access Protocol : An Internet email protocol that allows access to
your email from any IMAP compatible browser. With IMAP, your mail resides on the server.
IP, Internet Protocol : The component of TCP/IP that handles routing.
IP Address : An identifier for a computer or device on a TCP/IP network. The format of an IP
address is a 32-bit numeric address written as four numbers separated by periods. Each number
can be zero to 255.
L2TP, Layer Two (2) Tunneling Protocol : An extension to the PPP protocol that enables ISPs
to operate Virtual Private Networks (VPNs). L2TP merges PPTP from Microsoft and L2F from
Cisco Systems. To create a L2TP VPN your ISP's routers must support L2TP.
IPSec, Internet Protocol Security : A set of protocols that support secure exchange of packets
at the IP layer. IPSec is most often used to support VPNs.
LAN, Local Area Network : A computer network that spans a relatively small area. Most LANs
connect workstations and personal computers. Each computer in a LAN is able to access data
and devices anywhere on the LAN. This means that many users can share data and resources
such as printers.
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