The address space 172.28.100.0/24 is currently used. If the subnet mask 172.28.100.0/30 is used to divide this address space into several subnets serving WAN links, how many subnets in total can the address space be divided into?

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Quizplus · Accepted Answer

The subnet mask 172.28.100.0/30 has a prefix length of 30, which means that the first 30 bits of the IP address are used for the network address, and the remaining 2 bits are used for the host address. This means that each subnet can have a maximum of 2^2 = 4 hosts. The address space 172.28.100.0/24 has a prefix length of 24, which means that the first 24 bits of the IP address are used for the network address, and the remaining 8 bits are used for the host address. This means that the address space can be divided into a maximum of 2^8 = 256 subnets. However, since the subnet mask 172.28.100.0/30 has a prefix length of 30, each subnet can only have a maximum of 4 hosts. Therefore, the address space can be divided into a maximum of 256 / 4 = 64 subnets.

The Address Space 172