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Which of the following is NOT a valid subnet mask?

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Question: Which of the following is NOT a valid subnet mask?

Options:

  1. 255.255.255.0
  2. 255.255.255.128
  3. 255.255.255.256
  4. 255.255.255.192

Correct Answer: 255.255.255.256

Solution: 

A subnet mask cannot have a value greater than 255 in any octet, making 255.255.255.256 invalid.

Which of the following is NOT a valid subnet mask?

Practice Questions

Q1
Which of the following is NOT a valid subnet mask?
  1. 255.255.255.0
  2. 255.255.255.128
  3. 255.255.255.256
  4. 255.255.255.192

Questions & Step-by-Step Solutions

Which of the following is NOT a valid subnet mask?
  • Step 1: Understand what a subnet mask is. A subnet mask is used in networking to divide an IP address into a network and host part.
  • Step 2: Know that a subnet mask is made up of four numbers (octets), each ranging from 0 to 255.
  • Step 3: Check the values in the subnet mask. Each octet must be between 0 and 255.
  • Step 4: Identify the subnet mask in question, which is 255.255.255.256.
  • Step 5: Look at the last octet (256) and see if it is within the valid range (0-255).
  • Step 6: Since 256 is greater than 255, it is not a valid value for a subnet mask.
  • Step 7: Conclude that 255.255.255.256 is NOT a valid subnet mask.
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