Answer Posted / anil

dns:-domain naming system
it is two types:
1.forword lookup
2.backword lookup
1.forword lookup:-*it is used to prodies the resolues the
host name to ipaddress.
*it maintain the hostname to ip address maping.
2.backword lookup:-*it is used to providing resolues the
ipaddress to hostname.
*it maintain ipaddress to hostname maping.




active directory:-it is a serves which contain all the
information of users & computer, share foredolder on
network's it maintain centerlized herical datbase.
advantages:-
*it is a full security.
*rename systemname,domain name.
*site to site relation ship is easy.

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977

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