DNS

This time I am going to write down sth related to Network also:
Do u know any thing about DNS? if not go and study!(oNE OF services it gives is mapping Host names to IP addresses )
I don't wanna tell more about it:
just there is a file in your computer that caches these mappings:U can alter it to reduce DNS query time:
it is located here:
c:\(drive on which windows is installed)\windows\sys32\drivers\etc\hosts.
Now u ask how shall i find IP addresses------in run/cmd and using nslookup instruction ofcourse.
Follow this path and try to change it .