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34.1 DNS Terminology
- Zone
-
The domain namespace is divided into regions called zones. For
instance, if you have opensuse.org,
you have the opensuse section, or zone, of the
org domain.
- DNS server
-
The DNS server is a server that maintains the name and IP information
for a domain. You can have a primary DNS
server for master zone, a secondary server for slave zone, or a slave
server without any zones for caching.
- Master zone DNS server
-
The master zone includes all hosts from your network and
a DNS server master zone stores up-to-date records for all the hosts
in your domain.
- Slave zone DNS server
- A slave zone is a copy of the master zone. The slave
zone DNS server obtains its zone data with zone transfer operations
from its
master server. The slave zone DNS server responds authoritatively
for the zone as long as it has valid (not expired) zone data. If the
slave cannot obtain a new copy of the zone data, it stops
responding for the zone.
- Forwarder
-
Forwarders are DNS servers to which your DNS server should send queries
it cannot answer.
- Record
-
The record is information about name and IP address. Supported records and their syntax
are described in BIND documentation. Some special records are:
- NS record
-
An NS record tells name servers which machines are in charge
of a given domain zone.
- MX record
-
The MX (mail exchange) records describe the machines to contact
for directing mail across the Internet.
- SOA record
-
SOA (Start of Authority) record is the first record in a zone file.
The SOA record is used when using DNS to synchronize data between
multiple computers.
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