About Subnetting calculation backtrack 5

This time it's time we learned subnetting calculation techniques. Subnetting calculation can be done in two ways, ways that are relatively slow and binary special way faster.

In virtually all questions about subnetting will range in four issues: Number of Subnets, Number of Hosts per Subnet, Block Subnet, and Host-Broadcast Address.

Writing in general is the IP address 192.168.1.2. But sometimes written with 192.168.1.2/24, what does this mean? This means that the IP address 192.168.1.2 with a subnet mask of 255.255.255.0. Well how come like that?

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