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Glossary

FSIP

Fast Serial Interface Processor: The Cisco 7000 routers' default serial

interface processor, it provides four or eight high-speed serial ports.

FTP

File Transfer Protocol: The TCP/IP protocol used for transmitting files

between network nodes, it supports a broad range of file types and is defined
in RFC 959. See also: TFTP.

full duplex

The capacity to transmit information between a sending sta-

tion and a receiving unit at the same time. See also: half duplex.

full mesh

A type of network topology where every node has either a phys-

ical or a virtual circuit linking it to every other network node. A full mesh
supplies a great deal of redundancy but is typically reserved for network
backbones because of its expense. See also: partial mesh.

Gigabit EtherChannel

See Fast EtherChannel.

Gigabit Ethernet

1000Mbps version of the IEEE 802.3. FastEthernet

offers a speed increase of 10 times that of the 10BaseT Ethernet specifi-
cation while preserving qualities such as frame format, MAC, mecha-
nisms and MTU.

GNS

Get Nearest Server: On an IPX network, a request packet sent by a

customer for determining the location of the nearest active server of a given
type. An IPX network client launches a GNS request to get either a direct
answer from a connected server or a response from a router disclosing the
location of the service on the internetwork to the GNS. GNS is part of IPX
and SAP. See also: IPX and SAP.

grafting

A process that activates an interface that has been deactivated by

the pruning process. It is initiated by an IGMP membership report sent to the
router.

GRE

Generic Routing Encapsulation: A tunneling protocol created by

Cisco with the capacity for encapsulating a wide variety of protocol packet
types inside IP tunnels, thereby generating a virtual point-to-point connec-
tion to Cisco routers across an IP network at remote points. IP tunneling
using GRE permits network expansion across a single-protocol backbone
environment by linking multiprotocol subnetworks in a single-protocol
backbone environment.

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