Which of the following is the correct subnet mask for a network that has 14 usab

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Question: Which of the following is the correct subnet mask for a network that has 14 usable IP addresses?

Options:

Correct Answer: 255.255.255.240

Solution:

A subnet mask of 255.255.255.240 (/28) provides 16 total addresses, allowing for 14 usable IP addresses.

Which of the following is the correct subnet mask for a network that has 14 usable IP addresses?

Which of the following is the correct subnet mask for a network that has 14 usable IP addresses?

Step 1: Understand that a subnet mask determines how many IP addresses are available in a network.
Step 2: Know that the total number of IP addresses in a subnet is calculated as 2 raised to the power of the number of bits available for hosts.
Step 3: For a subnet mask of /28, there are 32 total bits in an IP address, and 28 bits are used for the network, leaving 4 bits for hosts.
Step 4: Calculate the total number of addresses: 2^4 = 16 total addresses.
Step 5: Remember that 2 addresses are reserved (one for the network and one for the broadcast), so the usable addresses are 16 - 2 = 14.
Step 6: Conclude that a subnet mask of 255.255.255.240 (or /28) provides exactly 14 usable IP addresses.

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