What is the default subnet mask for a class C address?

To answer this question, we need to understand the concept of subnet masks and classful addressing.

In classful addressing, IP addresses are divided into three main classes: Class A, Class B, and Class C. Each class has a default subnet mask associated with it.

Class C addresses are used for small networks, as they provide a larger number of host addresses compared to Class A and Class B addresses. The default subnet mask for a Class C address is 255.255.255.0.

Let's go through each option to understand why it is correct or incorrect:

Option A) 255.0.0.0 - This option is incorrect because it represents the default subnet mask for a Class A address, not a Class C address.

Option B) 255.255.0.0 - This option is incorrect because it represents the default subnet mask for a Class B address, not a Class C address.

Option C) 255.255.255.0 - This option is correct because it represents the default subnet mask for a Class C address.

Option D) 255.255.255.255 - This option is incorrect because it represents a subnet mask with all bits set to 1, which is not a valid subnet mask for any class of IP address.

The correct answer is C) 255.255.255.0. This option is correct because it represents the default subnet mask for a Class C address.

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