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IT Interview Questions:You installed a new AD domain and the new (and first) DC has not registered its SRV records in DNS. Name a few possible causes. What are the benefits and scenarios of using Stub zones?
Information Technology (IT) Interview Questions and Answers
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IT Interview Questions:You installed a new AD domain and the new (and first)
DC has not registered its SRV records in DNS. Name a few possible causes.
What are the benefits and scenarios of using Stub zones?
Understanding stub zones
A stub zone is a copy of a zone that contains only
those resource records necessary to identify the authoritative Domain Name
System (DNS) servers for that zone.
A stub zone is used to resolve names
between separate DNS namespaces. This type of resolution may be necessary
when a corporate merger requires that the DNS servers for two separate DNS
namespaces resolve names for clients in both namespaces.
A stub zone consists
of:
•
The start of authority (SOA) resource record, name server (NS) resource
records, and the glue A resource records for the delegated zone.
The IP
address of one or more master servers that can be used to update the stub
zone. The master servers for a stub zone are one or more DNS servers
authoritative for the child zone, usually the DNS server hosting the primary
zone for the delegated domain name.
Using stub zones
Updated: January 21, 2005
Using stub zones
Use stub zones to:
•
Keep delegated zone information current.
By updating a stub zone for one
of its child zones regularly, the DNS server hosting both the parent zone and
the stub zone will maintain a current list of authoritative DNS servers for
the child zone.
•
Improve name resolution.
Stub zones enable a DNS server to perform
recursion using the stub zone's list of name servers without needing to query
the Internet or internal root server for the DNS namespace.
•
Simplify DNS administration.
By using stub zones throughout your DNS
infrastructure, you can distribute a list of the authoritative DNS servers
for a zone without using secondary zones. However, stub zones do not serve
the same purpose as secondary zones and are not an alternative when
considering redundancy and load sharing.
There are two lists of DNS servers involved in the loading and maintenance of
a stub zone:
•
The list of master servers from which the DNS server loads and
updates a stub zone. A master server may be a primary or secondary DNS server
for the zone. In both cases, it will have a complete list of the DNS servers
for the zone.
•
The list of the authoritative DNS servers for a zone. This
list is contained in the stub zone using name server (NS) resource records.
When a DNS server loads a stub zone, such as widgets.example.com, it queries
the master servers, which can be in different locations, for the necessary
resource records of the authoritative servers for the zone
widgets.example.com. The list of master servers may contain a single server
or multiple servers and can be changed anytime.
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