Default subnet mask of class A IP address is _________
2016
Default subnet mask of class A IP address is _________
Answer: C. 255.0.0.0 — In classful IPv4 addressing, a Class A network allocates its first 8 bits (the first octet) for the Network ID and the remaining 24 bits for Host IDs. Setting…
- A.
255.255.0.0
- B.
0.0.0.255
- C.
255.0.0.0
- D.
255.255.255.0
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Correct answer: C
In classful IPv4 addressing, a Class A network allocates its first 8 bits (the first octet) for the Network ID and the remaining 24 bits for Host IDs. Setting all network bits to 1s yields the default subnet mask 255.0.0.0. Therefore, Option C is correct.
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