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| NetSlider 2002-03-22, 4:55 pm |
| Hey ppls
Is there really any chance of getting a question where they ask you to convert a binary IP address (11001010.11111111.00000000.10101010) to a decimal address???
I've encountered the question on 2 example exams now...
I know how to convert them with the calc.exe but do not know how to do it with my head...
Does anyone know the formula etc for these problems? Or is it not needed?
Regards
Mr. N | |
| mrfixit 2002-03-22, 5:03 pm |
| Never saw it on my exam, but that was a while back. Even if you do, the text provides a calc up in the corner. | |
| TxBear 2002-03-22, 6:22 pm |
| No conversions on my test today, thank goodness  And if you get any questions on that there is a calculator button up in the top right portion of the screen. They also tell you about it before the test starts.
Bear | |
| claudio rivas 2002-03-22, 6:24 pm |
| It is simple
Exponent
7 6 5 4 3 2 1 0
2 2 2 2 2 2 2 2
Value/Position
1 1 1 1 1 1 1 1
Decimal Value
128 64 32 16 8 4 2 1
Here the important is the position of the 1, this metod is not so cientific but works
Just add the 1's
Example:
Convert 11010101 to decimal notation.
1 1 0 1 0 1 0 1
128 + 64 + 0 + 16 + 0 + 4 + 0 + 1 = 213
any doubt...
http://www.mcsefreak.com/intro.htm
go to study guides and then go to subnetting guide | |
| anthonie 2002-03-22, 7:18 pm |
| I never get any conversion question in any of the exams I've taken. I'd be much delighted if there were a whole bunch of them. They'd make my time in the testing room much easier. 
You don't really need the calculator to do the conversion. It's pretty simple as explained by claudio.
Good luck! | |
| chodan 2002-03-22, 8:44 pm |
| I agree
Also if you want to get into networking you MUST learn to do it mentally without using
IP calculators or memorizing tables.
You need to eventually internalize it so it is automatic, when that happens you will not bat an eye at subnetting or address conversion. | |
| Slinky 2002-03-22, 8:50 pm |
| quote:
Originally posted by chodan
I agree
Also if you want to get into networking you MUST learn to do it mentally without using
IP calculators or memorizing tables.
You need to eventually internalize it so it is automatic, when that happens you will not bat an eye at subnetting or address conversion.
I agree 95%. Having a firm grasp on the fundamentals is crucial. I've seen people become too dependent on calculators, and if you asked them to do something without it, they wouldn't have a clue where to start. But for the basic math, a calculator can be helpful. Just don't rely on it for going directly to the answer. If you know what I mean. | |
| chodan 2002-03-22, 8:58 pm |
| I see your point.
I must admit the first time I went through the MCSE track with NT4 I relied on the calculator.
But by the time I went through the cisco proffesional track and the MCSE 2000 track I no longer needed it.
It takes time to get it at that level but with practice it will come. | |
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