Calculating a Subnet Mask You\'re the network administrator for a growing ISP. O

Question

Calculating a Subnet Mask You're the network administrator for a growing ISP. One of the networks the IANA assigned to you is 198.60.123.0/24. You have decided to use this address to satisfy the requirements of 16 corporate customers, each needing between 10 and 14 public addresses. Without using a subnet calculator, calculate a subnet mask that meets the requirements. In the following chart, write the subnet mask along with the 16 subnetworks in CIDR notation, and list the range of host addresses each subnetwork will have available:

Subnet Mask: Subnetwork Range of host addresses

Explanation / Answer

Convert IP to Binary 198.60.123.0

                             11000110.00111100.01111011 .00000000

If the first bit is 0 it is a Class A address If the first two bits are 10 it is a Class B address If the first three bits are 110 it is a Class C address If the first four bits are 1110 it is a Class D multicast address If the first four bits are 1111 it is a Class E experimental address

For Class C address Subnet Mask = 255.255.255.0

ubnet Mask: Subnetwork Range of host addresses 198.60.123.17 1-17 198.60.123.34 18-34 198.60.123.51 35-51 198.60.123.68 52-68 198.60.123.85 69-85 198.60.123.100 86-100 198.60.123.118 101-118 198.60.123.135 119-135 198.60.123.156 136-156 198.60.123.180 157-180 198.60.123.200 181-200

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