ZyXEL Communications 400, Руководство пользователя

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Gateway 400 User Guide | Glossary
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D
DHCP Server The Dynamic Host Configuration Protocol (DHCP) is used automatically as-
sign an unused IP address from an address range to a computer or device on
the network. Other information such as the name of the domain and the
gateway can also be passed to the client. A DHCP server enables a new com-
puter to be fully integrated in an existing network automatically without any
further configuration. The computer must only be set to automatically obtain
an IP address. The assignment of IP addresses is carried out for all network de-
vices that are connected via the LAN or WLAN.
DLNA Digital Living Network Alliance - is a collaborative trade organization includ-
ing, among others, the manufacturers of computers and consumer electron-
ics. Its goal is to ensure interoperability between devices from different
manufacturers.
DNS DNS stands for
Domain Name Server
. A DN server contains a database of
mappings of IP addresses and domain names. Every computer and every web-
site on the Internet has a unique IP address consisting of a pattern of four dot-
separated numbers in the following format:
212.227.181.140 . The IP address
of a site is usually assigned a name (the so-called domain) so that you don’t
have to remember the numerical code. For example, when you enter the do-
main name
www.zyxel.com with the http protocol and the Internet service,
an IP address is actually accessed via the DNS.
DSL Digital Subscriber Line. In 1998, the German Telekom introduced new access
technology in telephone networks under the term T-DSL. The so-called xDSL
techniques use conventional copper lines as a broadband medium.
DSL modem A device with which a computer can dial into the Internet using DSL (e.g., the
Sphairon Modem Turbolink AR860). The Gateway 400, by contrast, also offers
telephony functions in addition to the simple option of dialing into the Inter-
net.
DynDNS DynDNS (Dynamic Domain Name Server) is an Internet service that allows the
Gateway 400 to be always accessed from the Internet under a fixed name
even though the assigned public IP address of the Gateway 400 may be
changed by the provider on dialing up to the Internet.
E
Encryption Coding of data (conversion to an unreadable (encrypted) string) for protection
against unauthorized access.
F
Firewall A firewall is a security feature to protect a computer or network. The firewall
monitors the data traffic between the computer/network and the Internet
and thus protects them against unauthorized access.
Firmware The term firmware refers to the underlying operating software of a hardware
component. By upgrading the firmware, the device can be equipped with new
functions without changing the hardware.