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If the range of IP 172.16.0.0/12 is class B , why can I use the subnet mask 255.255.255.0 in this range? - Quora
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You are designing a subnet mask for the 172.26.0.0 network. You want 26 subnets with up to 1800 hosts on each subnet. What subnet mask should you use? - Quora
Learning Subnetting Part 5 - Find the Networks /17, /18, /25, /26, /27 - YouTube
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