when should we use wild card in eigrp config?

From: Steven (adream@xxxxxxx)
Date: Thu Jan 10 2002 - 00:48:24 GMT-3

   
If one router has 2 ints which runs eigrp ,
any difference between the following 2 configs.
I found no difference in a situation which 3 routers running eigrp only,no
matter we use" no auto-summ" or not on this router.
It seems the second one saves you one line config.
When do i have to use wild card when using "net ...."in eigrp config?

router eigrp 1

 network 168.71.7.0 0.0.0.255
 network 168.71.9.0 0.0.0.255

router eigrp 1

 network 168.71.0.0

Thanks.

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