2. 计算机
  3. An access list was written with the four statements shown in the graphic． Which single access list statement will combine all fo

An access list was written with the four statements shown in the graphic． Which single access list statement will combine all fo

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问题 An access list was written with the four statements shown in the graphic． Which single access list statement will combine all four of these statements into a single statement that will have exactly the same effect?
选项 A、access-list 10 permit 172．29．16．0 0．0．0．255
B、access-list 10 permit 172．29．16．0 0．0．1．255
C、access-list 10 permit 172．29．16．0 0．0．3．255
D、access-list 10 permit 172．29．16．0 0．0．15．255
E、access-list 10 permit 172．29．0．0 0．0．255．255
答案C
解析 用一个单独的语句来匹配上面写出的四条ACL，也就一一个汇总的问题，将172．29．16．0/24，172．29．17．0/24, 172．29．18．0/24, 172．29．19．0/24进行汇总，将他们的第3个八字节以二进制展开，相同的位作为他们的汇总的条目，然后计算他们的掩码位数为多少，所以这四个条目汇总到一个条目为172．29．16．0/22,掩码用通配符来写应该是0．0．3．255。
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