Subnetting question(dealing with Hosts)

I've seen this question in tests numerous times, and I'm sure it's shown up on exams better(not the exact question), so I'm wondering how your suppose to solve this type of question quickly.

Your subnet mask is 255.192.0.0, you know that there are 10 network bits and 22 remaining host bits. The question asks you how many hosts are available to use(ignore subnet zero).

Now we all know the solution to this would be to take 22^2 to find the answer...but when your taking the CCNA or similar exams, how do you do this fast enough when you only have paper? :P

(Assuming I did that correct, it's been a while)

KG

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Comments

wastedtime

I had that table mostly memorized that was the easiest way for me. An don't forget it would be 22^2 - 2 because of the broadcast address and network address.

Jiggsaww

whoa.......i hope i dont get ah ques like that

bbel121

Here is a pretty good page that breaks it down for you...it is dedicated to subnetting

http://www.thebryantadvantage.com/TheBryantAdvantageMasterySeries.html

John

evanderburg

I have up to 2^20 memorized because you encounter it in all kinds of IT situations but anything higher than that and I just double it a few times.

wastedtime

Heh, just noticed I wrote it backwards up there should be 2^22.

suprchgtnt

learn binery- super simple and you can do it in your head

Ahriakin

2^10=1024, easiest for me to remember (ie. To the power of 10 is the nearest to 1000) if you're dealing with 20+ then multiply 1024x1024= 2^20, then just multiply by what ever is left (eg. 2^22 then do 1024x1024x4 (Since 2^2 is kinda easy

), just break it into workable subsets. Still some math involved vs. memorisation but it's simpler and faster imho.

WastedTime - Edit. NM...Im an idiot and was thinking subnets.