Ambiguous questions regarding subnetting (subnet zero)

IncInc Member Posts: 184
Hello everyone,

Should I assume that when not stated, subnet zero is assumed to be in use?

Clarification: I am speaking about questions where the mask is given and you have to calculate available/usable subnets/hosts.

Like for and example /28

This gives us 16 subnets with 16 IP addresses in each. There are 14 usable IP addresses in each case.

With subnet zero we can use 16 subnets.
Without subnet zero we can use 14 subnets.

So, how can I know for sure, whether the subnet zero is in use if it is not stated and what would be the default value to assume (I tend to think that it would be that subnet zero is used)?

This has me frustrated since previous attempt.

Oh, I didn't mention it. I am sitting the exam tomorrow and I am comfortable with subnetting, just that ambiguous questions tend to drive me into frustration fields.

Hoping to hear some comments from you,
Inc

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