Ace the Network Systems Exam 1 Practice Test 2026 – Connect, Compute, Conquer!

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What is the default subnet mask for a Class C network?

255.0.0.0

255.255.0.0

255.255.255.0

Classful IPv4 addressing uses a default subnet mask based on the address class. For Class C, the network portion is contained in the first three octets, leaving the last octet for hosts. That means 24 bits for the network, so the default subnet mask is 255.255.255.0. This mask supports up to 254 usable host addresses per subnet. The other masks correspond to different classes or special cases: 255.0.0.0 is Class A, 255.255.0.0 is Class B, and 255.255.255.255 is a broadcast address, not a default subnet mask.

255.255.255.255