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计算机
Refer to the exhibit. The access list has been configured on the S0/0 interface of router RTB in the outbound direction. Which t
Refer to the exhibit. The access list has been configured on the S0/0 interface of router RTB in the outbound direction. Which t
admin
2019-04-08
52
问题
Refer to the exhibit. The access list has been configured on the S0/0 interface of router RTB in the outbound direction. Which two packets, if routed to the interface, will be denied?
access-list 101 deny tcp 192.168.15.32 0.0.0.15 any eq telnet
access-list 101 permit ip any any
选项
A、source ip address: 192.168.15.5; destination port: 21
B、source ip address:, 192.168.15.37 destination port: 21
C、source ip address:, 192.168.15.41 destination port: 21
D、source ip address:, 192.168.15.36 destination port: 23
E、source ip address: 192.168.15.46; destination port: 23
答案
D,E
解析
这个访问列表定义了两个语句: access-list 101 deny tcp 192.168.15.32 0.0.0.15 any eq telnet access-list 101 permit ip any any在访问列表中匹配的顺序是从上到下,如果匹配了某一句,就退出访问列表,如果没有就一直往下匹配,在访问列表中有一句隐含的拒绝所有。所以不管怎么样都有一句是能被匹配的。在上题中,他定义的第一句是拒绝到从192.168.15.32- 192.168.15.47发出的任何的telnet 的流量,然后第二句定义的就是允许所有的IP流量。而且要明确telnet的流量使用的是端口23,所以这个题的答案就很明确了。
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