Dell 3-DNS Administrator's Manual page 158

Glossary
watchdog timer card
wide IP
WKS (well-known services)
WKS record
zone
zone file
Glossary-12
The watchdog timer card is a hardware device that monitors the 3-DNS
Controller for hardware failure.
A wide IP is a collection of one or more domain names that maps to one or
more groups of virtual servers managed either by BIG-IP systems,
EDGE-FX Caches, or by host servers. The 3-DNS Controller load balances
name resolution requests across the virtual servers that are defined in the
wide IP that is associated with the requested domain name.
Well-known services are protocols on ports 0 through 1023 that are widely
used for certain types of data. Some examples of some well-known services
(and their corresponding ports) are: HTTP (port 80), HTTPS (port 443), and
FTP (port 20).
A WKS record is a DNS resource record that describes the services usually
provided by a particular protocol on a specific port.
In DNS terms, a zone is a subset of DNS records for one or more domains.
In DNS terms, a zone file is a database set of domains with one or many
domain names, designated mail servers, a list of other name servers that can
answer resolution requests, and a set of zone attributes, which are contained
in an SOA record.