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Need help with a subnetting problem...
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| wackatax 2003-08-25, 6:09 pm |
| Hi...I'm new to subnetting...I've done lots of research on this topic...but still haven't figured out what the subnet ids will be when you subnet more than one octet...all the material i've read on subnetting more than one octet are really vague... here's the question i'm having trouble with:
The number of physical segments I require for my network is 850.
The number of hosts per physical segment I require is 12,000.
And my assigned network address is 33.0.0.0
what would be my proposed custom subnet mask?
and what would the subnet ids be for my first five physical segments?
furthermore do you guys have any advice on websites that would give me detailed info on subnetting?
thanx... | |
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| blackwidow 2003-08-25, 9:07 pm |
| For 33.0.0.0/8 (default) network to be broken into 850 subnets, each with 12,000 hosts, here's the mask:
255.255.192.0 (or /18)
Hence you will have 2^10 = 1022 subnets
AND you will have 2^14 = 16382 hosts per each of the above 1022 subnets.
Your first subnet will be 38.0.64.0/18
Your last subnet will be 38.255.128.0/18
(*In some instances, 38.0.0.0/18 and 38.255.192.0/18 can be used also but ignore this part cos it's beyond the scope of your question. Stick with above.)
If you need more detailed explanation, ask and i can post more here.
(Btw, Is University of Illinois redesigning it's networks entirely??  | |
| blackwidow 2003-08-25, 9:09 pm |
| "Hence you will have 2^10 = 1022 subnets
AND you will have 2^14 = 16382 hosts per each of the above 1022 subnets."
Sorry, forgot to mention that 1022 and 16382 is a result of subtracting the loopback and broadcast addresses subtracted (which again can be used in some instances but is beyond the scope of the posting here) | |
| blackwidow 2003-08-25, 9:11 pm |
| My bad .. I wanted to ask if DEC Corporation is redesigning it's networks (mistyped at arin  | |
| jeff_j_black 2003-08-26, 9:17 am |
| Thanks for the save BW...
Yeah I look at it this a.m. and I know I wanted 14 host bits, so why'd I come up with /19? Anyway have to stay in practice. | |
| nero64 2003-08-26, 9:30 am |
| I can work out the subnet ID's and the count back to get the mask but working out the IP network id's might take a bit of practise.
Basically you have to redesign what you have originally been given which can sometimes get confusing.
33.0.64.0/18
compared to the original 33.0.0.0/8 | |
| blackwidow 2003-08-26, 5:04 pm |
| Subnet zero has been addresses quite a bit in detail here, and mentioned made that it is now usable, but with certain level of knowledge, which i do not think is within the scope of the CCNA exam. However, technically, it is a valid option for router to router connection or a subnet/netwide broadcast.
Read about it here:
http://www.cisco.com/en/US/tech/tk6...html#subnetzero |
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