+12 votes
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If a class $B$ network on the Internet has a subnet mask of $255.255.248.0$, what is the maximum number of hosts per subnet?

1. $1022$
2. $1023$
3. $2046$
4. $2047$
asked
edited | 2.7k views

## 2 Answers

+23 votes
Best answer
Number of zeros are to be counted for calculating the total number of possible hosts per subnet.

$255$-$248$ = $7$ can be represented using $3$ $bits$

these $3$$bits + 8$$bits$ more = $11$ $bits$

So, possible subnets $=$2$^{11}$ out of these $2$ are reserved as subnet $ID$ and $DBA$

Therefore, we have maximum possible usable hosts = $2$^{$11$}-$2$ = $2046$
answered by Boss (30.8k points)
edited
0
what does 'per subnet' means then ?
0
per subnet means here it is class B network , so no of network bits is known so we can know no of subnet bits. In which each subnet can have many hosts . Here many subnets are possible so per subnet means in each subnet how many hosts are present
–1 vote
ans c)
answered by Loyal (5.3k points)
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