Q
If you had a 255.255.255.0 subnet mask, how many usable IP addresses would you have for hosts?
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Answer
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Step 1: Identify the number of 1s in the subnet mask.
The subnet mask 255.255.255.0 has 24 1s (the first three octets are all 255, which is 11111111 in binary).
Step 2: Calculate the number of networks and hosts per network.
- Number of networks: 2^(number of 1s in the subnet mask) = 2^(24) - Hosts per network: 2^(number of 0s in the subnet mask) - 2 Since the fourth octet is all 0s, there are 8 0s, so 2^8 = 256. However, we subtract 2 because the first address is used for the network and the last address is used for the broadcast address, leaving 254 usable addresses for hosts.
Final Answer
However, this question asks for the total number of usable IP addresses for hosts, so we multiply the number of networks by the number of usable IP addresses per network: (2^24) x (254) = 16,777,214 usable IP addresses for hosts.
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