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If pic is not clear: Data:

Dept1 (with X link) has 287 hosts. Dept2 (with Y link) has 510 hosts. Dept3 (with Z link) has 254 hosts. 

Qstn: If above network uses class C network 192.203.16.0 then find DBA for dept Y. (Assume all are in the same network.)

How can this be done? Dept2 has 510 hosts , so 9 bits needed. But as it is a Class C IP, can you get my confusion? Kindly help me clarify it. How to even proceed for this qstn?

EDIT: Here's the explanation pic 

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2 Answers

Best answer
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First of all this question is wrong. This complete network can not be configured with single class C network. !

Yes, Y can not be configured because 510 > 254 (Maximum hosts configurable in any class C)  !

Directed Broadcast Id => Network ID followed by all 1's in Host ID part .

So none of option is correct !
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this question is above my head . it might be from supernetting , cus we take one bit from network part , but then what will be the DBA

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