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IT Interview Questions: What are the benefits and scenarios of using Conditional Forwarding?
Information Technology (IT) Interview Questions and Answers
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IT Interview Questions: What are the benefits and scenarios of using
Conditional Forwarding?
Rather than having a DNS server forward all queries it cannot resolve to
forwarders, the DNS server can forward queries for different domain names to
different DNS servers according to the specific domain names that are
contained in the queries. Forwarding according to these domain-name
conditions improves conventional forwarding by adding a second condition to
the forwarding process.
A conditional forwarder setting consists of a domain name and the IP address
of one or more DNS servers. To configure a DNS server for conditional
forwarding, a list of domain names is set up on the Windows Server 2003-based
DNS server along with the DNS server IP address. When a DNS client or server
performs a query operation against a Windows Server 2003- based DNS server
that is configured for forwarding, the DNS server looks to see if the query
can be resolved by using its own zone data or the zone data that is stored in
its cache, and then, if the DNS server is configured to forward for the
domain name that is designated in the query (a match), the query is forwarded
to the IP address of a DNS Server that is associated with the domain name. If
the DNS server has no domain name listed for the name that is designated in
the query, it attempts to resolve the query by using standard recursion.
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