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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.