70-218 - How many subnet can I have?

Author

How many subnet can I have?

prajuab

2002-12-23, 10:06 pm

If I get one class "C" say "203.144.248.0",
And I set my subnet mask to 255.255.255.240.
How many subnets do I have?
14 or 16 or else?

Slinky

2002-12-25, 9:09 pm

You will have 14 subnets, because when you use .240 you are borrowing 4 bits, so 2 ^ 4 - 2 = 14. Hope that helps.

chodan

2003-01-05, 8:23 am

quote:
Originally posted by Slinky
You will have 14 subnets, because when you use .240 you are borrowing 4 bits, so 2 ^ 4 - 2 = 14. Hope that helps.

This is may be true for the test.
But in the real world you can throw out the -2.
When finding hosts for a subnet yes keep the -2 even in the real world.
but when strapped for IP addresses you will use every subnet.

examtaker

2003-01-05, 8:56 am

You will have 16 possible subnets.

Tronn

2003-01-05, 6:03 pm

quote:
Originally posted by examtaker
You will have 16 possible subnets.

But for the exam you will only have 14 subnets.

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