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EN/LZT 108 6377 R4 - September 2003
91
- E -
Encapsulation
A technology that enables one network to send its data via another
network's connections. Encapsulation works by encapsulating a network
protocol within packets carried by the second network. Encapsulation is
also called tunneling.
Ethernet
A local-area network (LAN) architecture that uses a bus topology and
supports data transfer rates of 10 Mbps. It 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.
- F -
Firewall
A system designed to prevent unauthorized access to or from a private
network. Firewalls can be implemented in both hardware and software, or a
combination of both. Firewalls are frequently used to prevent unauthorized
Internet users from accessing private networks connected to the Internet,
especially intranets. All messages entering or leaving the intranet pass
through the firewall, which examines each message and blocks those that
do not meet the specified security criteria. See also Stateful Inspection.
Firmware
Firmware is a combination of software and hardware consisting of software
(programs or data) that has been written onto read-only memory.
FTP
Abbreviation of File Transfer Protocol, the protocol used on the Internet for
sending files.
- G -
Gateway
A node on a network that serves as an entrance to another network. In
enterprises, the gateway is the computer that routes the traffic from a
workstation to the outside network that is serving the Web pages. In
homes, the gateway is the ISP that connects the user to the Internet.
G.dmt
A kind of asymmetric DSL technology, based on DMT modulation, that
offers up to 8 megabits per second downstream bandwidth, 1.544 Megabits
per second upstream bandwidth. "G.dmt" is actually a nickname for the
standard officially known as ITU-T Recommendation G.992.1.