In the book I found the same quastion and they chose 3 bits so why 3 bit? 1. Con

Question

In the book I found the same quastion and they chose 3 bits so why 3 bit? 1. Consider a company that has a network that uses the IP address 194.148.1.0/24. The company needs to create 6 subnetworks. a. How many actual subnets can the company create? b. List the different subnets and their address ranges c. Assume that the company's network supports VLSM and the company wants to put 4 servers in one subnet with no other users allowed on the subnet. Assume that this subnet is derived from one of the 6 subnets. Show how this subnet can be created.

Explanation / Answer

Dear Student,

Here is the reason why in the book the answerer has chosen 3 bits..?

In the question company wants to create 6 subnetworks.

So to create 6 subnetorks we have to borrow 3 bits from the host bits. If we borrow 3 bits then

Total Subnets = 23 = 8  

(So this is the maximum subnets created if we borrow three bits and we require only 6 subnets hence our requirement fulfills).

below is the further explanation...

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Total subnets ( 2N) :- 23 = 8          (N is the borrow's bits it is also called network bits.)
Block size (256 - subnet mask) :- 256 - 224 = 32
Valid subnets ( Count blocks from 0) :- 0,32,64,96,128,160,192,224
Total hosts per subnet (2H) :- 25 = 32
Valid hosts per subnet ( Total host - 2 ) :- 32 - 2 = 30  

(becuse we have 2 bits reserve one for network and another for broadcast address that is why Valid host = Total Host -2)

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Kindly Check and Verify Thanks...!!!

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