通过CIDR技术，把4个主机地址220.78.169.5、220.78.172.10、220.78.174.15和220.78.168.254组织成一个地址块，则这个超级地址块的地址是（ ）。
- A.220.78.177.0/21
- B.220.78.168.0/21
- C.220.78.169.0/20
- D.220.78.175.0/20
正确答案及解析
正确答案
解析
由于一个CIDR地址块中有很多地址，所以在路由表就利用CIDR地址块来查询目的网络。这种地址的聚合常称为路由聚合。它可以让路由表中一个项目可以表示原来传统分类的很多个路由。
把4个主机地址220.78.169.5、220.78.172.10、220.78.174.15和220.78.168.254组织成一个地址块，方法是首先转换为二进制的形式，找出最大的相同位数，作为汇聚后的网络位：
由于，220.78一样，所以我们只转换第三段。
10101001
10101100
10101110
10101000
所以最大的相同位数是8+8+5=21。网络地址就是202.78.168.0/21。
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