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Home > Archive > CCNA > January 2003 > Subnetting
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| mystic0463 2003-01-18, 4:40 pm |
| I have a question and need a favor on subnetting...
#Question: Does anyone have any good online sources which will enable to me to pass the subnetting portion of the exam? I'm currently enrolled in a CCNA class in school, and the instructor was teaching us an easier way to do it, but I got so lost...I have the sybex study guide book, but my instructor told me that the book doesn't cover it very well. So I was hoping that maybe someone can point me to some good online guides that aren't too difficult to understand. I hear that subnetting can be very tedious. I'm willing to work all the examples needed to get good at it, but I just need some good online resources to get past the cisco portion of it....
Take Care and thanx so much in advance! You guys/gals are awesome here!
Dusty | |
| Liquidius 2003-01-18, 6:14 pm |
| the best thing i can tell u is to get with your instructor and get his/her help with it. i'm not saying that there arent any sources on the net, just dont know of any myself. hopefully someone here will give u advice on this subject. sorry that i cant help more. try that while u wait for a reply from someone who could be more helpful than myself.
-Liquidius | |
| mystic0463 2003-01-18, 7:10 pm |
| Liquid, actually if I type in "subnetting" there are a ton of "teach yourself subnetting" type of links, so I know that it's out there, but I was thinking that maybe others know of some sites that they learned it on...I would ask my instructor, but unfortunately, it's a fast-track class, and we cover the entire subject in 1 month, so I don't really have the time to get with him...I guess all I can do is, try a couple of those links...and see if I can learn it from there...It suppose to be easy once you get the hang of it, I just haven't got the hang of it yet  ...
take care......... Dusty | |
| ZFletche 2003-01-18, 8:09 pm |
| The Todd Lammle books gives you a five step method to figure out subnetting. There are many resources to learning subnetting, just do a search on google. You need to have subnetting down, several questions on my test put you in a situation where they give a diagram with all relative information and tell you to determine the problem, it my case it was either an address outside of the proper subnetwork or wrong subnet altogether.  | |
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| mystic0463 2003-01-18, 11:41 pm |
| Boul,
thanx so much, I'll try that link....
Dusty | |
| Wretched_0ne 2003-01-23, 9:18 am |
| http://www.linuxjournal.com/article.php?sid=6287
You might like this page on subnetting also. Don't feel bad if you have trouble understaning subnetting, it is a XXXXX at first but you will get it eventually. I find that on some things I need to do a lot of research so I will go to a Borders or Barnes and Nobles outlet so I can look at several books that hit on the same subject. | |
| rjingra 2003-01-29, 10:33 am |
| I read the Lamelle books and although the 5 step method in them was good (as long as I didn't mind the binary), I got soooo confused.
I've been studying the 640-607 for several months, using the Sybex materials, the online course thru KnowledgeNet, and the Cisco ICND. After all of this I still had a problem with "quickly" subnetting until I picked up a copy of the Cisco CCNA Exam 640-607 Certification Guide. Wendell Odom explains it better than anyone I've read thus far and now I believe I understand it and can do one in about 1-3 mins without binary!
He put it out there like this:
Network # :198 57 78 0
SubN Mask :255 255 255 224
SubN Numb :198 57 78 0
1st Valid IP:198 57 78 1
Broadcast :198 57 78 31
Last Val IP:198 57 78 30
1. So for this addr the mask ends in a # other than 255, so you subtract 256-224=32 (the magic # is the result).
2. To find the subnet, the subnet is the magic # multiplied by whatever to be less than or equal to the last octet of the ip. Since the ip ends in 0, then 32 can't be multiplied into it so the subnet is 0.
3. The 1st valid ip is 1 up from the subnet, the broadcast is 0+32-1=31 (subnet num + magic num - 1). Note the magic num is 256-what ever the last octet of the sub mask in this case 224=32).
4. The last valid IP is Broadcast-1=30.
A Magic # is only used if the last octet of the mask ends in something other than 0. If the mask ends in 0 say, then it would work out like this:
198.57.78.0 Network #
255.255.255.0 SNet Mask
198.57.78.0 SNet #
198.57.78.1 1st Valid IP
198.57.78.255 Broadcast
198.57.78.254 Last Valid IP
Maybe I'm wrong but if you can pick up a copy of the book described earlier, isbn 1-58720-055-4, you'll get the gist of what I'm talking about. After reading this book I can do most of the calculations in my head... | |
| mystic0463 2003-01-29, 11:28 am |
| Thanx for sharing!!! I'll check out the links everyone provided as well as the book....
take care......... |
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