_______________ is the default subnet mask for class C IP network

Question

BlackTom AI · Accepted Answer

Class C addresses use a default subnet mask of 255.255.255.0, commonly written as /24.

1) Relevant knowledge points and concepts
- IPv4 address classes: Class A (1–126.x.x.x), Class B (128–191.x.x.x), Class C (192–223.x.x.x).
- Default subnet masks: Class A = 255.0.0.0 (/8), Class B = 255.255.0.0 (/16), Class C = 255.255.255.0 (/24).
- Subnet mask in binary shows which bits are network (1) vs host (0).

2) Step-by-step reasoning
- Class C networks occupy the first three octets for network portion and the last octet for hosts.
- Therefore the mask must have 24 ones followed by 8 zeros to mark the network/host division.

3) Intermediate calculations (binary and host count)
- 255.255.255.0 in binary: 11111111.11111111.11111111.00000000 (that is 24 ones then 8 zeros).
- Number of host bits = 8, so number of usable hosts per default Class C network = 2^8 − 2 = 256 − 2 = 254 (subtracting network and broadcast addresses).

4) Why the correct answer is correct
- 255.255.255.0 exactly corresponds to the /24 mask that reserves three octets for the network, which is the defining characteristic of Class C. This yields the expected 254 usable hosts per network and matches standard IP classful addressing.

5) Why the other options are incorrect
- a. 192.168.1.0 — this is an example network address (often a Class C network’s network ID), not a subnet mask.
- b. 174.16.1.1 — this is a host IP address (first octet 174 is in Class B range), not a subnet mask.
- c. 255.255.0.0 — this is the default mask for Class B (/16), not Class C.

6) Conclusion
The correct default subnet mask for a Class C IP network is 255.255.255.0, which matches option d.

_______________ is the default subnet mask for class C IP network单项选择题

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