an ISP owns a block IP address of the form 101.111.128/17
now we want to create 4 subnets of equal size from this block
then the prefix (101.111.a.b/x) of these four subnets are ???
不解的是 前17個位元固定 後面要怎麼切才能分成四個相同size的子網路啊??
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