Question

In the IPv4 addressing format, the number of networks allowed under Class C addresses is

• A. $2^{21}$
• B. $2^{14}$
• C. $2^{24}$
• D. $2^7$

Answer 1

The correct option is A $2^{21}$

No. of Networks in class 'C" are $2^{21}$ as in class "C" there
$\begin{array}{cc}\underset{}{}& \underset{}{}\\ 24bits& 8bits\\ Netid& hostid\end{array}$
out of 24 bits 3-bits are used for representation class "C" i.e. 110
$\therefore$ 21 bits with 21 bits we can make $2^{21}$networks.