what does 'per subnet' means then ?

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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 $3\;\text{bits}$

these $3\;\text{bits} + 8\;\text{bits}$ more $= 11\;\text{bits}$

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

Therefore, we have maximum possible usable hosts $= 2^{11}-2 = 2046$

Correct Answer: $C$

$255-248 = 7$ can be represented using $3\;\text{bits}$

these $3\;\text{bits} + 8\;\text{bits}$ more $= 11\;\text{bits}$

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

Therefore, we have maximum possible usable hosts $= 2^{11}-2 = 2046$

Correct Answer: $C$

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we all know that a class b network in general has 16 bits for network ID and 16 bits for host ID but subnet mask is given as to 48 in the third octet that means all the five bits are occupied that means we will have 30 subnets possible subnetworks can be made now only 3 bits from the third of data remaining and entire 4th Octet is remaining that means we have 11 bits for host now we are asked in the question that how many hosts per subnet we can form the answer is 2 to the power 11 - 2 that is 2046 that is the answer