Answer :
a) To create 30 subnets in a Class A network, we need to borrow 5 bits from the host portion of the address. This means that the subnet mask would be 255.248.0.0, which provides a maximum of 2^(16-8-5) = 2,048 hosts per subnet.
To create 122 subnets in a Class A network, we need to borrow 7 bits from the host portion of the address. This means that the subnet mask would be 255.254.0.0, which provides a maximum of 2^(16-8-7) = 512 hosts per subnet.
b) To create 30 subnets in a Class B network, we need to borrow 4 bits from the host portion of the address. This means that the subnet mask would be 255.255.240.0, which provides a maximum of 2^(16-16-4) = 4,096 hosts per subnet.
To create 122 subnets in a Class B network, we need to borrow 6 bits from the host portion of the address. This means that the subnet mask would be 255.255.252.0, which provides a maximum of 2^(16-16-6) = 1,024 hosts per subnet.
c) To create 30 subnets in a Class C network, we need to borrow 3 bits from the host portion of the address. This means that the subnet mask would be 255.255.255.224, which provides a maximum of 2^(8-3) = 32 hosts per subnet.
To create 122 subnets in a Class C network, we need to borrow 4 bits from the host portion of the address. This means that the subnet mask would be 255.255.255.240, which provides a maximum of 2^(8-4) = 16 hosts per subnet.
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