My question is as follows :-
I have an access-list,
access-list 99 permit 18.104.22.168 and I want to ONLY allow this ACL as incoming to my router,R4 and no other routes. R4 has 2 serial interfaces s0/0 and s0/1.
To accomplish this, I am doing the following  :-
router eigrp 100
distribute-list 99 in
My q is that is it necessary to specify the following OR  would do the job.
distribute-list 99 in s0/0
distribute-list 99 in s0/1