Specifications

Equalizer Installation and Administration Guide 203
Envoy Equalizer add-in; software that supports geographic clustering and load
balancing. See geographic cluster, geographic load balancing, and load
balancing. See also intelligent load balancing.
Equalizer Administration
Interface
An Equalizer window with which you can monitor Equalizer’s operation; view
statistics; add, modify, or clusters; add, modify, and delete servers; and shut
down a server or Equalizer through a Javascript-enabled browser.
Equalizer Configuration Utility An Equalizer feature that enables you to configure Equalizer, set parameters,
and shut down and upgrade Equalizer.
external address The IP address assigned to Equalizer on the external network.
external interface A network interface used to connect Equalizer to the external network. See
interface, internal interface, and network interface.
external network The subnet to which the client machines and possibly the Internet or an
intranet are connected.
failover The act of transferring operations from a failing component to a backup
component without interrupting processing.
firewall A set of security programs, which is located at a network gateway server and
which protect the network from any user on an external network. See gateway.
FQDN See Fully Qualified Domain Name (FQDN).
FTP File Transfer Protocol; rules for transferring files from one computer to another.
FTP cluster A virtual cluster providing service on the FTP control port (port 21). See cluster
and virtual cluster.
Fully Qualified Domain Name
(FQDN)
The complete, registered domain name of an Internet host, which is written
relative to the root domain and unambiguously specifies a host’s location in the
DNS hierarchy. For example,
east is a hostname and east.coyotepoint.com is
its fully qualified domain name. See also domain name.
gateway A network route that typically translates information between two different
protocols.
geographic cluster A collection of servers (such as Web sites) that provide a common service over
different physical locations. See cluster.
geographic load balancing Distributing requests as equally as possible across servers in different physical
locations. See load balancing. See also intelligent load balancing.
geographic probe A query sent to a site in a geographic cluster to gather information so Equalizer
can determine the site that is best able to process a pending request. See
geographic cluster.
header One or more lines of data that identify the beginning of a block of information
or a file.
hot backup Configuring a second Equalizer as a backup unit that will take over in case of
failure. Also known as a hot spare. See backup Equalizer. See also primary
Equalizer.
A server can also be used as a hot backup, or hot spare, within a cluster. If all
the other servers in the cluster fail, the hot spare will begin processing
requests for the cluster.
HTTP HyperText Transfer Protocol; the protocol with which a computer or user
access information on the World Wide Web.
HTTPS HyperText Transfer Protocol (Secure); a server application programmed to run
under the Windows NT operating system.
hub A device that joins all the components attached to a network.