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Cisco™ CCNA : Subnetting
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Subnetting Scenario Question 3
Determine the range of valid IP Addresses for an X subnet mask ? (Assume X value to be 240 in this case)
Tip : Convert X to binary and determine the decimal value of lowest high order bit, start the range of addresses at that value, and increment the range by that value.
.
Solution :
Step 1: Convert 240 to binary. Binary equivalent of 240 is as shown --------->
Step 2: The decimal value of lowest high order bit is 16 (2
4
) as seen from the figure above. Therefore, this number becomes the increment value to determine the IP address ranges.
Subnet Mask: 255.255.255.240
Subnet Bits: 28 Host Bits: 4
Number of Subnets: 16 Hosts per Subnet: 14
The range of addresses for the given mask is as shown ------>
Note: All zeros and all ones host addresses cannot be used.