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

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

Options:

Correct Answer: /29

Solution:

The subnet mask 255.255.255.248 corresponds to /29, as it has 29 bits set to 1.

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

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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