In the IPv4 addressing format, the number of networks allowed under Class C addresses is
(A) 2^14
(B) 2^7
(C) 2^21
(D) 2^24
Answer: (C)
Explanation: In class C, 8 bits are reserved for Host Id and 24 bits are reserved for Network Id. Out of these 24 Network Id bits, the leading 3 bits are fixed as 110. So remaining 21 bits can be used for different networks. See this for more details.
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