Filter
Top Products
Glossary
EN/LZT 108 6492 R2 - October 2003
121
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 critera.
Firmware
Firmware is a combination of software and hardware consisting of software
(programs or data) that has been written onto read-only memory.
FTP
Short for File Transfer Protocol. A program used to transfer files between
computers connected to the Internet. Common uses include uploading new
or updated files to a web server, and downloading files from a web server.
- 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.
G.lite
A kind of asymmetric DSL technology, based on DMT modulation, that
offers up to 1.5 megabits per second downstream bandwidth, 384 Kilobits
per second upstream, does not usually require a splitter and is easier to
install than other types of DSL. "G.lite" is a nickname for the standard
officially known as G.992.2.
- H -
Hop
When you send data through the Internet, it is sent first from your computer
to a router, and then from one router to another until it finally reaches a
router that is directly connected to the recipient. Each individual “leg” of the
data’s journey is called a hop.
Hop count
The number of hops that data has taken on its route to its destination.