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To anybody who could help....
In my cisco class were currently learning subnetting something that really is confusing me right now. Just wondering if anybody know's a site that could simplify it for me or something. I'm open to suggestions. Thanks for the help in advance. XTRA
This thread may help you out. Check it out here .
Good Luck
To put it pretty simply
Subnetting is used to cut done network traffic
Eg. If you have an accounting dept. an inventory dept and a bunch of architects all on the same network they really have no reason to talk to each other very often(computers) so you break up the network into subnets. This way the traffic stays in a certain area(subnet)
Subnetting is really used in very large networks or across a WAN.
Hope this helps
The funny thing is once IP version 6 replaces version 4(not sure what happened to 5) we won’t have any need for subneting because of the massive amount of ip numbers that will be available. All your networks will be seperated nice an clean at the “.”
http://www.microsoft.com/windows2000.../introipv6.asp
Im taking cisco right now, but having a hard time figuring it out. Its hard to understand.
I took the ICND class about 2 months ago. I was able to get the subnetting down with some easy methods compiled from different people. Maybe I will write up a tutorial if there isn't already one out there.
I was under the impression that the reason behind subnetting was to reduce overhead on backbone connectivity. Is there some additional functionality in the IPV6 implementation that increases traffic efficiency?Quote:
Originally posted here by cwk9
The funny thing is once IP version 6 replaces version 4(not sure what happened to 5) we won’t have any need for subneting because of the massive amount of ip numbers that will be available. All your networks will be seperated nice an clean at the “.”
http://www.microsoft.com/windows2000.../introipv6.asp
Subnetting is for routing purposes, not for traffic purposes. Physical seperations in the network are to cut down on traffic, routing allows this to happen, and subnetting is used to simplify the routing tables. So to say subnetting reduces traffic is not correct, you could have 20 computers on a hub on 10 different subnets and it wouldn't do you any good.
Can I just tell you that I'm stupid? For some dumb reason, I was thinking that subnetting was dividing your network up into more managable groups using routers/hubs/switches. The thing that kills me is that I KNOW what subnetting is...at least I USUALLY do. Hmm...I guess it had just been a long day. Thanks for setting me straight, shkuey.
Note to self: When tired, punchy, and feeling superior, keep mouth shut. :bigsmile:
Well Roswell1329 that makes two of us that are apparently stupid, cos i was thinking the same thing as yourself!Quote:
Ive just started learning TCP/IP, so looks like ive got a LOT to learn!
Regards
r3b00+
I know this is an older thread but this is a good site for novices learning to subnet. I think it could be very helpful to learn the basics and beyond. It contains multiple lessons in Windows Media format and really explains things well I think.
www.learntosubnet.com
A few points :
Subnetting is for routing and traffic control and to give you more available addresses to assign your machines from the few you may only have from your original network id !
As for those taking Cisco, you should really understand ip addressing already as it should be a pre-requisite ! I used to teach CCNA and CCNP courses as well as a plethora of Microsoft courses and Comptia to name a few !
But there is plenty of inormation available on google as well as i the previos threads on that subject and in the tutorials section !
And dont get despondent as there is no such thing as a bad student only a bad teacher.
And the only difficult question is the one you dont know the answer too.
A good deal subnetting is explained in TCP/IP Illustrated by W.R.Stevens(volume 1).Its a nice book for any one wanting to learn TCP/IP .
There are three Subnetting tutorials posted on this website, I wrote one of them. If you want me to e-mail you the copy of the lesson I teach for my class I can do that as well.
The main thing that confuses most people about subnetting is that there is a network mask and then an added subnet mask. Also, DON'T THINK IN DECIMAL, if you look at it in binary subnetting is much clearer. Routers use binary not decimal or hexidecimal. The binary in the first octet tells you what class you are dealing with. This tells you the required Network Mask and how many Octets are out of your control. It also reveals how many octets you do control and those are the octets you can sub-net.
Never forget you always lose 2 networks and two hosts when you subnet since all 0's and all 1's are reserved for broadcast and multicast. Interestingly enough the best description of subnetting I have ever read in a book, and the one that answered my questions clearly, was in a Novell CNE study guide. The number of networks is 2^n-2 where n is the number of 1's in your subnet mask (do not include the network mask) and the number of hosts is the same but n represents the number of 0's in your sub-net mask.
When teaching networking though the most common hang ups I run into are those I just mentioned: You must convert to binary and learn masking in binary then see what it looks like in decimal, you must realize that there is a network mask and a seperate sub-net mask, you must know the formula 2^n-2 to find the number of networks and hosts on your SUB-NET mask (do not include the network mask portion in this calculation). Subnet masking is confusing at first but it is not really difficult if you learn the binary reason why it works. Like I said I have tutorial on here as well as two others that approach the problem slightly differently. If you want my full write up I use in class I will be glad to send it to you just PM me.