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

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

Options:

  1. 255.255.255.252
  2. 255.255.255.248
  3. 255.255.255.240
  4. 255.255.255.224

Correct Answer: 255.255.255.252

Solution: 

A subnet mask of 255.255.255.252 allows for 2 usable IP addresses (4 total - 2 for network and broadcast), which is suitable for point-to-point links.

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

Practice Questions

Q1
What is the subnet mask for a network with 30 usable IP addresses?
  1. 255.255.255.252
  2. 255.255.255.248
  3. 255.255.255.240
  4. 255.255.255.224

Questions & Step-by-Step Solutions

What is the subnet mask for a network with 30 usable IP addresses?
  • Step 1: Understand that a subnet mask determines how many IP addresses are available in a network.
  • Step 2: Know that each subnet has a certain number of usable IP addresses based on the subnet mask.
  • Step 3: Calculate the number of IP addresses needed. For 30 usable IP addresses, we need to find a subnet that can accommodate at least 32 addresses (30 + 2 for network and broadcast).
  • Step 4: Recognize that the formula for calculating the number of usable IP addresses is 2^n - 2, where n is the number of bits available for hosts.
  • Step 5: Find the smallest n such that 2^n - 2 >= 30. In this case, n = 5 because 2^5 - 2 = 30.
  • Step 6: Determine the total number of bits in an IPv4 address, which is 32 bits. Subtract the 5 bits used for hosts from 32 to find the bits used for the network: 32 - 5 = 27.
  • Step 7: The subnet mask is represented in CIDR notation as /27, which corresponds to 255.255.255.224.
  • Step 8: Verify that a /27 subnet provides 32 total IP addresses (30 usable + 1 network + 1 broadcast).
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