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Glossary

Frame Relay switching

When a router at a service provider provides

packet switching for Frame Relay packets.

frame tagging

VLANs can span multiple connected switches, which

Cisco calls a switch-fabric. Switches within this switch-fabric must keep
track of frames as they are received on the switch ports, and they must keep
track of the VLAN they belong to as the frames traverse this switch-fabric.
Frame tagging performs this function. Switches can then direct frames to the
appropriate port.

framing

Encapsulation at the Data Link layer of the OSI model. It is called

framing because the packet is encapsulated with both a header and a trailer.

FRAS

Frame Relay Access Support: A feature of Cisco IOS software that

enables SDLC, Ethernet, Token Ring, and Frame Relay-attached IBM
devices to be linked with other IBM mechanisms on a Frame Relay network.
See also: FRAD.

frequency

The number of cycles of an alternating current signal per time

unit, measured in Hertz (cycles per second).

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.

gateway of last resort

Term used when the default route is set.

Gigabit EtherChannel

See: Fast EtherChannel.

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