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4.1.2. Prefix and Network Mask
The prefix (CIDR notation) or network mask defines which portion of the address is the network vs host.
172.16.0.0/16 means 172.16.0.0 with mask 255.255.0.0
192.168.1.0/24 means 192.168.1.0 with mask 255.255.255.0
10.1.1.0/30 means 10.1.1.0 with mask 255.255.255.252