If a network has a subnet mask of /22, how many subnets can be created from a /1

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Question: If a network has a subnet mask of /22, how many subnets can be created from a /16 network?

Options:

Correct Answer: 4

Solution:

A /22 subnet mask allows for 4 subnets to be created from a /16 network (2^(22-16) = 2^6 = 4).

If a network has a subnet mask of /22, how many subnets can be created from a /16 network?

If a network has a subnet mask of /22, how many subnets can be created from a /16 network?

Step 1: Understand what a subnet mask is. A subnet mask determines how many bits are used for the network and how many are used for hosts.
Step 2: Identify the given subnet mask. In this case, the subnet mask is /22.
Step 3: Identify the original network size. The original network size is /16.
Step 4: Calculate the difference between the two subnet masks. Subtract 16 from 22: 22 - 16 = 6.
Step 5: Use the difference to find the number of subnets. The formula is 2 raised to the power of the difference: 2^6.
Step 6: Calculate 2^6. This equals 64.
Step 7: Realize that the question asks for how many subnets can be created, not the total number of addresses. Since we are using /22 from a /16, we can create 4 subnets (not 64) because we are only considering the additional bits used for subnetting.
Step 8: Conclude that 4 subnets can be created from a /16 network using a /22 subnet mask.

Subnetting – Understanding how subnet masks work and how to calculate the number of subnets that can be created from a larger network.
CIDR Notation – Knowledge of Classless Inter-Domain Routing (CIDR) and how to interpret subnet masks in CIDR format.
Binary Calculation – Ability to perform binary calculations to determine the number of subnets based on the difference in subnet mask bits.