Refer to the exhibit.

Statements A, B, C, and D of ACL 10 have been entered in the shown order and applied to
interface E0 inbound, to prevent all hosts (except those whose addresses are the first and last IP
of subnet 172.21.1.128/28) from accessing the network. But as is, the ACL does not restrict
anyone from the network. How can the ACL statements be re-arranged so that the system works
as intended?

A.
ACDB

B.
BADC

C.
DBAC

D.
CDBA

Explanation:
Routers go line by line through an access list until a match is found and then will not look any
further, even if a more specific of better match is found later on in the access list. So, it it best to
begin with the most specific entries first, in this cast the two hosts in line C and D. Then, include
the subnet (B) and then finally the rest of the traffic (A).