What is the network address for a Class C network?

• A. 192.168.0.0
• B. 192.168.0.1
• C. 192.168.100.0
• D. 192.168.1.0

Answer: (C)

In a Class C network, the network portion is the first three octets and the last octet is used for hosts. With the default subnet mask of 255.255.255.0, the network address is the one where the host part is all zeros—meaning the last octet is 0.

So 192.168.100.0 is a valid network address for the 192.168.100.0/24 network because it follows that rule exactly: the first three octets identify the network, and the final octet is 0. The other options either have a nonzero host part (like 192.168.0.1) or would be the network address for different /24 networks (such as 192.168.0.0 or 192.168.1.0 for their respective networks).