Discussion
Assuming classbased addressing scheme, in an university has 35 (thirty five) departments and uses a class B address. If use 6 (six)-bit subnet number and 10-bit host number then how many Ethernet segments and maximum hosts in each Ethernet segment are possible ?
Answer: D
The answer is 64, 1022.
A class B address has 16 host bits, split here into a 6-bit subnet number and a 10-bit host number:
\[ \begin{aligned} \text{subnets} &= 2^{6} = 64 \\ \text{hosts} &= 2^{10} - 2 = 1022 \end{aligned} \]
Two host addresses in every subnet are reserved, the all-zeros host part for the network and the all-ones host part for broadcast, so each Ethernet segment can have 1022 hosts. 64 segments are enough for the 35 departments. 1024 forgets the two reserved addresses, while 256 and 254 are the figures for an 8-bit host field.
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