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Module 2: fastest way to find which subnet a host belongs to?

I'm on the Addressing module and the subnetting drills are killing me on time. Given 172.16.20.45/27, how do I work out the network address and the valid host range quickly, without long division? Is there a trick…
subnettingaddressingipv4exam
itayitayy · posted Jun 4, 2026
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