what exactly are the diference in: -- hostname1 IN A 1.1.1.1 hostname2 IN A 1.1.1.1 -- and -- hostname1 IN A 1.1.1.1 hostname2 IN CNAME hostname1 -- what is the right way to do this, with A or CNAME? or in this: -- hostname1 IN A 1.1.1.1 -- and -- hostname1 A 1.1.1.1 -- what mean IN in this?