Question

A subnetted Class B network has the following broadcast address : 144.16.95.255. Its subnet mask

Answer 1

Broadcast address in class B:
144.16.95.255 = 144.16.01011111.11111111
We know that in broadcast address all the host bit will be 1. So any subnet mask tells how many bits we borrowed from hosts bits in class B network.
So,
\(\begin{matrix}
144.16.01011111.11111111\\\underline{255.255.11100000.00000000}
\\144.16.\underbrace{010}\underbrace{00000.00000000}
\\\overset{Subnet}{bits}\;\;\;\;\;\; \overset{Host}{bits}

\end{matrix}\)
Since all Host bits are 1 in given IP address. So,
255.255.224.0 can be used as subnet mask.
Since all Host bits are 1 in given IP address. So,
255.255.224.0 can be used as subnet mask.
\(\begin{matrix}
144.16.01011111.11111111\\\underline{255.255.11110000.00000000}
\\144.16.\underbrace{0101}\underbrace{0000.00000000}
\\\overset{Subnet}{bits}\;\;\;\;\;\; \overset{Host}{bit}

\end{matrix}\)
Since all Host bits are 1 in given IP address. So,
255.255.240 can be used as subnet mask.
\(\begin{matrix}
144.16.01011111.11111111\\\underline{255.255.11111000.00000000}
\\144.16.\underbrace{01011}\underbrace{000.00000000}
\\\overset{Subnet}{bits}\;\;\;\;\;\; \overset{Host}{bit}

\end{matrix}\)
Since all Host bits are 1 in given IP address, so 255.255.248 can be used as subnet mask.