Configuring UNIX DNS client:

Make sure your logged in as ROOT

Bash-2.03$  su

Password: xxxxxxx

Now use a text editor

# vi /etc/resolve.c

Now enter the domain and then name server

Domain Microsoft.com

Nameserver 192.168.1.2

We can also use search instead of domain, here we have an option to enter in till 6 domains and sub domains.

Ex:

Search  Microsoft.com east.microsoft.com

Now save the etc/resolve.conf file

#w

How the DNS request process works?

When a DNS client sends a request to a DNS server, the DNS server checks to see if it is authoritative for the zone (domain) in the request or the request has been cached and if so, returns the response

Recursion:

When a DNS server is not authoritative for the specified zone it begins the recursion process.

When the local DNS server cannot server the client DNS request, it sends the request to ROOT server on top, ex: .COM, the root retrieves number .COM domains. From that we chose xyz.com and are forwarded to recursion server.

           Once the recursion process is finished, the xyz.com info is cached in local DNS server.

Lost and found folder in AD users and computers:

Suppose we have a 2 domain controllers, if an admin makes changes to one object and if another admin also makes changes to the same object at same time, these changes are stored in the LOST and Found folder.