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66.
What Intrasite and Intersite Replication ?

Intrasite is the replication with in the same site & intersite the replication between sites.

67.
What is the use of SRV record ?

SRV records are used to identify servers running specific services within the domain. DNS is required within an Active Directory Domain Services domain, and the existence of SRV records is a core reason

68.
Describe CNAME Record ?

A CNAME record is used to allow a single server to respond to multiple names. DNS queries with any of the names (from the A record or any of the CNAME records) will respond with the same IP address.

69.
How to look at the Schema ?
register schmmgmt.dll using this command
c:\windows\system32>regsvr32 schmmgmt.dll 
Open mmc --> add snapin --> add Active directory schema 
name it as schema.msc 
Open administrative tool --> schema.msc
70.
Which type of DNS query results in the server returning its best answer from the cache or local data ?

An iterative query results in the server sending back its best guess from data residing in its cache or local zones.