what is DNS & Active diretory ?

Answer Posted / syed masood

DNS:
service that translates domain names into IP
addresses. Because domain names are alphabetic, they're
easier to remember. The Internet however, is really based
on IP addresses. Every time you use a domain name,
therefore, a DNS service must translate the name into the
corresponding IP address. For example, the domain name
www.example.com might translate to 198.105.232.4.
The DNS system is, in fact, its own network. If one DNS
server doesn't know how to translate a particular domain
name, it asks another one, and so on, until the correct IP
address is returned.

Active Directory:
A directory service from Microsoft that is
a part of Windows 2000. It is an implementation of Internet
standard directory and naming protocols that uses a
database engine for transactional support, and also
supports a variety of application programming interface
standards.

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