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What is the CIDR notation for a subnet mask of 255.255.255.248?

Practice Questions

Q1
What is the CIDR notation for a subnet mask of 255.255.255.248?
  1. /24
  2. /25
  3. /26
  4. /29

Questions & Step-by-Step Solutions

What is the CIDR notation for a subnet mask of 255.255.255.248?
  • Step 1: Understand what a subnet mask is. A subnet mask helps to divide an IP address into a network and host part.
  • Step 2: Convert the subnet mask 255.255.255.248 into binary. Each octet (number between dots) is converted separately: 255 = 11111111, 255 = 11111111, 255 = 11111111, 248 = 11111000.
  • Step 3: Count the number of 1s in the binary representation. In 11111111.11111111.11111111.11111000, there are 29 ones.
  • Step 4: Write the CIDR notation. The CIDR notation is written as a slash followed by the number of 1s counted, which is /29.
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