Refer to the exhibit．Statements A,B,C,and D of ACL 10 have been entered in the shown order and app;ied 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 dose not restrict anyone from the network．How can the ACL statements be re-arranged so that the system works as intended?

A、 CDBA
B、 DBAC
C、 ACDB
D、 BADC

【正确答案】 A

【答案解析】每个访问列表的最后一行隐含“deny”语句。
因此要在访问列表末尾使用“permit any”命令。
每个列表应当至少有一个允许语句，否则将会拒绝所有流量。
所以，BCD错。