The TCP/IP Guide - IP "Supernetting": Classless Inter-Domain Routing (CIDR) Hierarchical Addressing and Notation
Network Subnetting Reference Sheet
Intro to Networking - IPv4 Addressing & Subnets – Ubiquiti Support and Help Center
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Solved CLO2.1 ?What subnet mask is represented by the slash | Chegg.com
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IP Routing on Subnets
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