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Glossary
expansion
The procedure of directing compressed data through an algo-
rithm, restoring information to its original size.
expedited delivery
An option that can be specified by one protocol layer,
communicating either with other layers or with the identical protocol layer
in a different network device, requiring that identified data be processed
faster.
explorer packet
An SNA packet transmitted by a source Token Ring
device to find the path through a source-route-bridged network.
extended IP access list
IP access list that filters the network by logical
address, protocol field in the Network layer header, and even the port field
in the Transport layer header.
extended IPX access list
IPX access list that filters the network by logical
IPX address, protocol field in the Network layer header, or even socket
number in the Transport layer header.
Extended Setup
Used in setup mode to configure the router with more
detail than Basic Setup mode. Allows multiple-protocol support and inter-
face configuration.
external route processor
A router that is external to the switch. An
external layer 3 routing device can be used to provide routing between
VLANs.
failure domain
The region in which a failure has occurred in a Token
Ring. When a station gains information that a serious problem, such as a
cable break, has occurred with the network, it sends a beacon frame that
includes the station reporting the failure, its NAUN, and everything
between. This defines the failure domain. Beaconing then initiates the pro-
cedure known as autoreconfiguration. See also: autoreconfiguration and
beacon.
fallback
In ATM networks, this mechanism is used for scouting a path if
it isn't possible to locate one using customary methods. The device relaxes
requirements for certain characteristics, such as delay, in an attempt to find
a path that meets a certain set of the most important requirements.
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