Newbie question

[Tonatiuh]

Hi gurus. I have the following question...

I have defined 2 domains in my DNS, let?s say banxico.org.mx and 
prueba.org.mx. For banxico.org.mx I have defined 3 different hosts: www, 
ftp and email; but for prueba.org.mx there aren?t any hosts defined, yet.

The funny thing is that you can?t ping the plain domain banxico.org.mx but 
you can do it with prueba.org.mx. What might be happening?


Thanks

Tonatiuh