ZyXEL Communications ZYWALL10 - Manual (Page 255)

ZyWALL 10 Internet Security Gateway
Glossary of Terms Q
Events These are network activities. Some activities are direct attacks on your system, while
others might be depending on the circumstances. Therefore, any activity, regardless of
severity is called an event. An event may or may not be a direct attack on your system.
FAQ
(Frequently Asked Questions) -- FAQs are documents that list and answer the most
common questions on a particular subject.
FCC
The FCC (Federal Communications Commission) is in charge of allocating the
electromagnetic spectrum and thus the bandwidth of various communication systems.
Firewall A hardware or software "wall" that restricts access in and out of a network. Firewalls are
most often used to separate an internal LAN or WAN from the Internet.
Flash memory
The nonvolatile storage that can be electrically erased and reprogrammed so that data
can be stored, booted, and rewritten as necessary.
FTP
File Transfer Protocol is an Internet file transfer service that operates on the Internet
and over TCP/IP networks. FTP is basically a client/server protocol in which a system
running the FTP server accepts commands from a system running an FTP client. The
service allows users to send commands to the server for uploading and downloading
files. FTP is popular on the Internet because it allows for speedy transfer of large files
between two systems.
Gateway
A gateway is a computer system or other device that acts as a translator between two
systems that do not use the same communication protocols, data formatting structures,
languages, and/or architecture.
Hacker Generally, a hacker is anyone who enjoys experimenting with technology including
computers and networks. Not all hackers are criminals breaking into systems. Some are
legitimate users and hobbyists. Nevertheless, some are dedicated criminals or vandals.
HDLC
HDLC (High-level Data Link Control) is a bit-oriented (the data is monitored bit by bit ) ,
link layer protocol for the transmission of data over synchronous networks.
Host
Any computer on a network that is a repository for services available to other computers
on the network. It is quite common to have one host machine provide several services,
such as WWW and USENET.
HTTP Hyper Text Transfer Protocol. The most common protocol used on the Internet. HTTP is
the primary protocol used for web sites and web browsers. It is also prone to certain
kinds of attacks.
IANA Internet Assigned Number Authority acts as the clearinghouse to assign and coordinate
the use of numerous Internet protocol parameters such as Internet addresses, domain
names, protocol numbers, and more. The IANA Web site is at http://www.isi.edu/iana.
ICMP
Internet Control Message Protocol is a message control and error-reporting protocol
between a host server and a gateway to the Internet. ICMP uses Internet Protocol (IP)
datagrams, but the messages are processed by the TCP/IP software and are not
directly apparent to the application user.