In a subnet mask of 255.255.255.0, how many usable IP addresses are available?

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Question: In a subnet mask of 255.255.255.0, how many usable IP addresses are available?

Options:

Correct Answer: 254

Solution:

A subnet mask of 255.255.255.0 allows for 256 total addresses, but 2 are reserved (network and broadcast), leaving 254 usable addresses.

In a subnet mask of 255.255.255.0, how many usable IP addresses are available?

In a subnet mask of 255.255.255.0, how many usable IP addresses are available?

Step 1: Understand what a subnet mask is. A subnet mask helps divide an IP address into a network part and a host part.
Step 2: Recognize that the subnet mask 255.255.255.0 means that the first 24 bits are used for the network and the last 8 bits are used for hosts.
Step 3: Calculate the total number of addresses. With 8 bits for hosts, you can have 2^8 = 256 total addresses.
Step 4: Identify the reserved addresses. One address is reserved for the network (the first address) and one for the broadcast (the last address).
Step 5: Subtract the reserved addresses from the total addresses. So, 256 total addresses - 2 reserved addresses = 254 usable addresses.

Subnetting – Understanding how subnet masks determine the number of available IP addresses in a network.
Usable IP Addresses – Recognizing that certain IP addresses are reserved for network and broadcast purposes.