What is the subnet mask for a network that requires 30 usable IP addresses?

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Question: What is the subnet mask for a network that requires 30 usable IP addresses?

Options:

Correct Answer: 255.255.255.224

Solution:

To accommodate 30 usable addresses, a /27 subnet mask (255.255.255.224) is needed, providing 32 total addresses (30 usable).

What is the subnet mask for a network that requires 30 usable IP addresses?

What is the subnet mask for a network that requires 30 usable IP addresses?

Step 1: Understand that each subnet has a certain number of total IP addresses based on the subnet mask.
Step 2: Remember that the formula to calculate the number of usable IP addresses is 2^n - 2, where n is the number of bits available for hosts.
Step 3: Set up the equation: 2^n - 2 = 30 (for 30 usable addresses).
Step 4: Solve for n: 2^n = 30 + 2, which means 2^n = 32.
Step 5: Find n: Since 2^5 = 32, n = 5.
Step 6: Calculate the subnet mask: The total number of bits in an IP address is 32. If 5 bits are for hosts, then 32 - 5 = 27 bits are for the network.
Step 7: Write the subnet mask in CIDR notation: /27.
Step 8: Convert /27 to decimal format: The subnet mask is 255.255.255.224.

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