Asus Internet Security Router User Manual download pdf (Page 160)

Appendix 16. Glossary Internet Security Router User’s Manual

144

element of URLs, which identify a specific file at a web site, e.g., http://www.asus.com.

See also DNS.

download To transfer data in the downstream direction, i.e., from the Internet to the user.

DSL Digital Subscriber Line

A technology that allows both digital data and analog voice signals to travel over

existing copper telephone lines.

Ethernet The most commonly installed computer network technology, usually using twisted pair

wiring. Ethernet data rates are 10 Mbps and 100 Mbps. See also 10BASE-T,

100BASE-T, twisted pair.

filtering To screen out selected types of data, based on filtering rules. Filtering can be applied in

one direction (upstream or downstream), or in both directions.

filtering rule A rule that specifies what kinds of data the a routing device will accept and/or reject.

Filtering rules are defined to operate on an interface (or multiple interfaces) and in a

particular direction (upstream, downstream, or both).

firewall Any method of protecting a computer or LAN connected to the Internet from intrusion or

attack from the outside. Some firewall protection can be provided by packet filtering

and Network Address Translation services.

FTP 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.

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. Alternatively, the

maximum number of hops that a packet is allowed to take before being discarded (see

also TTL).

host A device (usually a computer) connected to a network.

HTTP Hyper-Text Transfer Protocol

HTTP is the main protocol used to transfer data from web sites so that it can be

displayed by web browsers. See also web browser, web site.

ICMP Internet Control Message Protocol

An Internet protocol used to report errors and other network-related information. The

ping command makes use of ICMP.

IGMP Internet Group Management Protocol

An Internet protocol that enables a computer to share information about its membership in

multicast groups with adjacent routers. A multicast group of computers is one whose

members have designated as interested in receiving specific content from the others.

Multicasting to an IGMP group can be used to simultaneously update the address books

of a group of mobile computer users or to send company newsletters to a distribution list.

Internet The global collection of interconnected networks used for both private and business

communications.

intranet A private, company-internal network that looks like part of the Internet (users access

information using web browsers), but is accessible only by employees.

IP See TCP/IP.

IP address Internet Protocol address

The address of a host (computer) on the Internet, consisting of four numbers, each

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