Question

What is the Custom Subnet Mask for the subnetted IP 204.188.89.0?

NOTE: do not add the /bits (extended prefix) to the end of your answer.

Is the same Custom Subnet Mask used for each of the four subnets? Yes or no?

Answer 1

Here it's mentioned that the number of subnets is 4.

So # of subnet bits required = ceil(log 4) = 2.

The given address is Class C IP address. In class C, the number of network address bits is 24.

For subnet mask, we need to make the 24 network bits + 2 subnet bits to 1 and remaining all bits to 0. Remaining for counting these 26 bits we will start counting from left side that is, MSB.

So the subnet mask is

11111111 11111111 11111111 11000000

=>255.255.255.192

Yes the subnet mask is going to be same for all the 4 subnet.

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