Can you plz explain to us that we dont know what is DNS cache and why we should clean it?
The DNS cache contains a record of all your system's DNS requests. It would look something like this (if it were a true text file)..
123.222.10.117 =
www.whatever.com123.16.10.118 =
www.something.com..and so on.
So, if in future your system whats to know what the IP address of
www.whatever.com is, it will look in the cache rather than requesting a name resolve from a DN server on the Net (for speed). However, if your DNS cache becomes corrupt or if one, or more, of the IP addresses have changed.. then you might be asked to clean it.