What are two reasons that a network administrator would use

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What are two reasons that a network administrator would use access lists?
A.to control vty access into a router
B.to control broadcast traffic through a router
C.to filter traffic as it passes through a router
D.to filter traffic that originates from the router
E.to replace passwords as a line of defense against security incursions
最近要考CCNA,这道题不太明白,希望能详细的讲讲,为啥对为啥错,

选A和C
A,控制一台路由器是否能通过VTY方式控制本地路由器,ACL可以做到.
B,控制广播流量通过路由器,明显是错的,ACL可以阻止,但是无法控制.
C,ACL可以过滤通过路由器的流量
D,ACL可以过滤路由器本地产生的流量,就是数据包的源地址是本地路由器,这是错的,ACL无法控制本地产生的数据包
E,ACL无法替换密码.显然也是错的.

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