In a subnet with a subnet mask of 255.255.255.248, how many usable IP addresses

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Question: In a subnet with a subnet mask of 255.255.255.248, how many usable IP addresses are there?

Options:

Correct Answer: 6

Solution:

A subnet mask of 255.255.255.248 allows for 2^3 - 2 = 6 usable IP addresses.

In a subnet with a subnet mask of 255.255.255.248, how many usable IP addresses are there?

In a subnet with a subnet mask of 255.255.255.248, how many usable IP addresses are there?

Step 1: Understand what a subnet mask is. A subnet mask helps to divide an IP address into a network part and a host part.
Step 2: Convert the subnet mask 255.255.255.248 into binary. It looks like this: 11111111.11111111.11111111.11111000.
Step 3: Count the number of '0's in the binary representation of the subnet mask. In this case, there are 5 '0's.
Step 4: Use the formula 2^n - 2 to find the number of usable IP addresses, where n is the number of '0's. Here, n = 5.
Step 5: Calculate 2^5, which equals 32.
Step 6: Subtract 2 from 32 to account for the network address and the broadcast address. So, 32 - 2 = 30.
Step 7: The number of usable IP addresses is 30.

Subnetting – Understanding how subnet masks determine the number of available IP addresses in a network.
Usable IP Addresses Calculation – Calculating usable IP addresses by subtracting network and broadcast addresses from total addresses.