How many usable hosts are available in a subnet with a /24 subnet mask?

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Question: How many usable hosts are available in a subnet with a /24 subnet mask?

Options:

Correct Answer: 254

Solution:

A /24 subnet mask allows for 256 total addresses, but 2 are reserved (network and broadcast), leaving 254 usable host addresses.

How many usable hosts are available in a subnet with a /24 subnet mask?

How many usable hosts are available in a subnet with a /24 subnet mask?

Step 1: Understand what a /24 subnet mask means. It means that the first 24 bits of the IP address are used for the network part.
Step 2: Calculate the total number of addresses in a /24 subnet. A /24 subnet has 2^(32-24) = 2^8 = 256 total addresses.
Step 3: Identify the reserved addresses. In every subnet, 1 address is reserved for the network address and 1 address is reserved for the broadcast address.
Step 4: Subtract the reserved addresses from the total addresses. So, 256 total addresses - 2 reserved addresses = 254 usable host addresses.

Subnetting – Understanding how subnet masks work and how to calculate usable host addresses.
IP Addressing – Knowledge of total addresses in a subnet and the significance of reserved addresses.