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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. $2047$
in Computer Networks by Veteran (52.2k points)
edited by | 3.3k views

2 Answers

+27 votes
Best answer
a 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$

Correct Answer: $C$
by Boss (30.7k points)
edited by
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)
by Loyal (5.2k points)

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