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TECHNICAL WORD REFERENCE
This section describes technical words used in this manual and basic terms for the
network technology.

D

Default Gateway
Default Gateway commonly refers to a gateway address of the router. The
router is a device that connects between a LAN and other LANs.
DHCP, dynamic host configuration protocol
DHCP is a protocol for the purpose of assigning dynamic IP addresses to
devices on a network. Using DHCP, the devices obtains the different IP ad-
dress every time the device connects to the network.
Domain
Domain defines a group of computers and devices on the network. Within the
Internet, domains are defined by the IP address or DNS name, such as
"toshiba.com".
DNS, domain name system (service)
DNS is an Internet service that manages the translations between IP addresses
and domain names. Instead of identifying a host with an IP address, the host
can be identified with alphabetic name using the DNS. Within the Internet, DNS
is commonly used to identify a host. For example, "www.toshiba.com" is a DNS
domain name that assigned using the DNS.
DSN, delivery status notification
DSN is a system to notify the electric mail sender of the status of the message
that been sent. The status, such as failed delivery, delayed delivery, success-
ful delivery, or the gateway of a message into an environment that may not
support DSNs, is notified when an electric mail with the DSN request is sent.

E

E-mail, electric mail
E-mail is the transmission of messages for over communications network, en-
ables to transfer the electric files stored on a disk between most mainframes
and computers on network.
E-mail Address
A name that identifies an electric post office box in a mail server within the
Internet. E-mail address consists of two elements, user name that identifies the
post office box in a mail server and host name that identifies the mail server,
and they are divided by "@". Within the Internet, usually the domain name is
used for the host name. For example, "ifax@toshiba.com" is an E-mail ad-
dress. "ifax" is a user name, and "toshiba.com" is the domain name that
identifies the mail server.
ESMTP, extended simple mail transfer protocol
ESMTP is defined as the service extensions based on SMTP, for the purpose of
providing some improvements from SMTP. Enhancing SMTP, ESMTP provides
a new command to support the DSN and MDN. (Refer to "SMTP")

F

FQDN, fully qualified domain name
FQDN is a domain name that completely identifies the host computer and
consists of a host and all level of the domain name. FQDN is always starts with
a host and ends with top-level domain. For example, when the host name is
"host1" and the domain name is "toshiba.com", the FQDN will be
"host1.toshiba.com".
FTP, file transfer protocol
FTP is a protocol commonly used for transferring files on the Internet.

G

H

Host
Host refers to a computer connected to a TCP/IP network.
Hostname
Hostname is a name to identifies a computer connected to a TCP/IP network.
Within the Internet, a DNS domain name is used for the Hostname.

I

IP Address
IP Address is used to identify the node on a TCP/IP network. It is described
with 32-bit numeric address written as four numbers separated by periods.
Internet
The Internet is a global network of networks connecting millions of computers
worldwide via many computer networks using a simple standard common ad-
dressing system and TCP/IP (Transmission Control Protocol/Internet Protocol).
Internet FAX
Internet FAX enables to transmit a facsimile through the local area network
(LAN) and the Internet communication instead of the public switched telephone
network (PSTN).