NetComm V85 User Manual

Page 51

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V85 Desktop VoIP Phone User Guide

51

YML772 Rev1

Filtering can be applied in one direction (upstream or down stream),

or in both directions.

Filtering rule

A rule that specifies what kinds of data 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.

GGP

Gateway to Gateway Protocol. An Internet protocol that specifies

how gateway routers communicate with each other.

Gbps

Abbreviation for Gigabits (GIG-uh-bits) per second, or one billion

bits per second. Internet data rates are often expressed in Gbps.

GRE

Generic Routing Encapsulation. TCP/IP protocol suite, transport

layer encapsulation protocol.

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

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

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.

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