If i'm designing a new subnet mask for a class C IP that will have 5 subnets that means I need to borrow 3 digits since 2^3-2 > 5. My question is, how many additional subnets do we have?
would it be 2^3-2 = 6 --> 6-5 = 1 additional subnet
or
would it be 2^3 = 8 --> 8-5 = 3 additional subnets