| Author |
Minor Rant on subnetting
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| VenomBlade 2002-08-08, 7:48 pm |
| Just trying to get a feel for everything on the exam looks like a lot of DNS, WINS, DHCP, and RRAS...and unfortunately subnetting questions. I hate those. Its why I have my handy dandy IP subnetting calculator. Why anyone would do it by hand is beyond me. ohh well just my opinion | |
| Zaraspook 2002-08-08, 8:21 pm |
| Since when can you use a subnetting calculator during the exam? | |
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| That's the point, though, isn't it? Why would anyone do this in real life? We have nifty tools, like subnetting calculators! | |
| buckwheat 2002-08-08, 8:46 pm |
| Like it or not you have to know how to subnet manually cuz most of us don't go around everyday at work with an IP sub calculator in our shirt pockets. | |
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| ....nor do we go around needing to variable subnet. At least not all day. And if you do, well, that's just got to sorta be your thing, doesn't it? One would hope. | |
| Pavlov 2002-08-09, 6:25 am |
| Okay - subnetting I can live with but somebody please tell me WHY would you use a server as a router when routers are so cheap nowadays???  | |
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| quote:
Okay - subnetting I can live with but somebody please tell me WHY would you use a server as a router when routers are so cheap nowadays???
Why? I don't think it is as much a question of why you would use one, as why would Microsoft want to attempt it. The answer to that is historic...Novell had it built in first. That, however, was back in the day when routers cost you your first born, and we booted our 386 servers with 5 1/4 inch floppies so as not to take up space on our 20 MB harddrives with too large of a DOS partition. (Man...saying that makes me feel old!)
There are actually alot of good reasons to use a server as a router. Small businesses are prime examples, they tend to get a bit big for their britches without the $$$ to back up the growth, but a few old machines lying around that will accomodate being utilized as a router. | |
| Tech Ranger 2002-08-09, 6:57 pm |
| Has anybody ever seen a bridge? | |
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| charlie69 2002-08-10, 7:29 pm |
| Subnetting seems to be one of my favorite things. I guess it just snapped with me. I do think that if you have binary down completely before you do subnetting it does seem to click even better. It's a good thing I like subnetting because there were at least 12 questions on it in my exam if not more?? | |
| charlie69 2002-08-10, 7:31 pm |
| P.S.
I do have a really good cheat sheet you can draw up and use before the test if anyone is interested! Let me know. Our teacher gave it to us to use and it works great! | |
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| The MCSEFREAK has about the best guide to subnetting you will ever find. I've used it extensively and reccomend it highly. It's been almost two years since I last looked at it, so the link has probably changed, but check out his site.
Highly worthwhile.
http://www.mcsefreak.com | |
| Bingram 2002-08-12, 10:04 pm |
| Why would you do it by hand?
IP conflicts adhear to Murhpy's Law of Networking -- If anything can go wrong, it will, and at the most important moment. Bingram corollary: The offending network device will be outside, on a windy day, with rain/sleet/snow, and your pencil will break or pen will run dry.
Here is my "trick" for subnets. Make a spreadsheet up and use your subnet calculator to fill in all the details (mask #s, # hosts per mask, # subnets per mask by address class). Print out, then study how to "rebuild" the chart either from memory or quick arithmetic.
Originally I posted my long detailed process how I do this. Too much to discribe. Basically remember valid masks run from 8 to 32. The number of subnets in a class A subnet with mask of 8 is 1. Double that number for # of subnets in mask 9. And double 9 for mask 10. Get the picture?
By some freek of mathematics, the # of hosts in a subnet mask of 8 is equal to (the # of subnets avalible in the 32 mask minus 2).
In short, while sitting at the exam desk, with nothing but scratch paper and pencil, I can recreate the subnet table and detail the number of hosts and avalivle subnets by mask in about 2-3 minutes. Furthermore it is simple arithmetic (2 times something or something minus 2), instead of those 2 to the power of 128 stuff. |
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