Question Regarding Subnetting

S

Sayth

Gawd
Joined
Oct 7, 2001
Messages
618
If I'm using subnet mask of 255.255.192.0
How do I find the dividing line between subnet 1, 2, 3 and 4?
I'm studying for the Network+ exam and was looking for a trick of the trade... Math algorithm or something ya know? :p

thanks
 
255.255.192.0 denotes that your networks will go up in 64's on the third octet... does that make sense, or do you require further explanation? i can break it down if required...
 
Okay so the subnets for 172.16.0.0 would be

172.16.0.1 to 172.16.63.254 --- Invalid
172.16.64.1 to 172.16.126.254
172.16.127.1 to 172.16.191.254
172.16.192.1 to 172.16.254.254 --- Invalid (or 172.16.255.255 ?)

?

I think I understand what you're saying...
64 because 255-192=63 ?
 
That is awesome!

yeah 256-192=64
I figured that but when you count 0 then 0-63 = 64 numbers.
So that's great guys thank you!
I hope someone else benefits from this post.
 
When I took Network+, there was nothing on subnetting. I wouldnt worry about it too hard about it for the exam. If there is even a question it just be on what is the purpose of subnetting. No math. It is good to know and if you are going into networking, its a must, but as for Network+ it isnt a must.
 
to go anywhere, anywhere at all, in the networking world requires you to subnet in your head on the fly. Don't do boolean algebra with bits, just use the magic number and you'll figure it all out. If you don't understand subnetting, you won't get far at all.
 
Okay yeah I wasn't sure if it was on the exam or not, but I wanted to make sure to understand it as I am hoping I can go for my CCNA next month....
I took CCNA1-4 in college a year ago and didn't do the exam... now I'm kicking myself, but I didn't grasp the subnetting concept then anyway.
After the Network+ course I completely understand it. I think it's teacher quality you know.

But thanks again!
 
if you go for the icnd1 and 2 , which is ccna divided up into two tests, believe me, you have to know how to subnet. Both simulations on the icnd1 had subnetting. Troubleshooting requires it, setting up a network needs it,you just can't know networking without it. One particular website has a test specifically for ip addresssing. And Nat requires subnetting. I,m sure you get the picture.
 
i thought i heard somewhere that tests like this and the ccna are doing away with questions on the old way of subnetting? (ie. losing the first and last subnets). anyone know if this is true? i could go on my rant again about doing subnetting like this, but i'll refrain :)
 
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