How many subnets can be created from a Class C network using a /28 subnet mask?

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Question: How many subnets can be created from a Class C network using a /28 subnet mask?

Options:

Correct Answer: 16

Solution:

A /28 subnet mask allows for 16 subnets (2^(28-24)), as Class C networks have a default mask of /24.

How many subnets can be created from a Class C network using a /28 subnet mask?

How many subnets can be created from a Class C network using a /28 subnet mask?

Step 1: Understand what a Class C network is. A Class C network has a default subnet mask of /24.
Step 2: Know that a /28 subnet mask means that 28 bits are used for the network part of the address.
Step 3: Calculate how many bits are used for the subnetting. Since the default mask is /24, the additional bits used for subnetting is 28 - 24 = 4 bits.
Step 4: Use the formula to find the number of subnets. The formula is 2 raised to the power of the number of bits used for subnetting. So, we calculate 2^4.
Step 5: Calculate 2^4, which equals 16. This means you can create 16 subnets from a Class C network using a /28 subnet mask.

Subnetting – Understanding how to divide a Class C network into smaller subnets using subnet masks.
CIDR Notation – Knowledge of Classless Inter-Domain Routing (CIDR) and how subnet masks are represented.
Binary Calculations – Ability to perform calculations based on binary representations of subnet masks.