Dell 3-DNS Administrator's Manual page 149

domain name
dynamic load balancing modes
dynamic site content
ECV (Extended Content Verification)
external interface
fail-over
fail-over cable
fallback method
FDDI (Fiber Distributed Data Interface)
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3-DNS Administrator Guide
A domain name is a unique name that is associated with one or more IP
addresses. Domain names are used in URLs to identify particular Web
pages. For example, in the URL http://www.siterequest.com/index.html,
the domain name is siterequest.com.
Dynamic load balancing modes base the distribution of name resolution
requests to virtual servers on live data, such as current server performance
and current connection load.
Dynamic site content is a type of site content that is automatically generated
each time a user accesses the site. Examples are current stock quotes or
weather satellite images.
On the 3-DNS Controller, ECV is a service monitor that checks the
availability of actual content, (such as a file or an image) on a server, rather
than just checking the availability of a port or service, such as HTTP on
port 80.
An external interface is the network interface that can be accessed across a
wide-area network (WAN). See also internal interface.
Fail-over is the process whereby a standby unit in a redundant system takes
over when a software failure or hardware failure is detected on the active
unit.
The fail-over cable is the cable that directly connects the two units in a
hardware-based redundant system.
The fallback method is the third method in a load balancing hierarchy that
the 3-DNS Controller uses to load balance a resolution request. The 3-DNS
Controller uses the fallback method only when the load balancing modes
specified for the preferred and alternate methods fail. Unlike the preferred
method and the alternate method, the fallback method uses neither server
nor virtual server availability for load balancing calculations. See also
preferred method, alternate method.
FDDI is a multi-mode protocol for transmitting data on optical-fiber cables
at speeds up to 100 Mbps.
Glossary
Glossary-3