> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > On Behalf Of Benjamin J. Weiss > Sent: Tuesday, September 30, 2003 9:22 AM > To: [EMAIL PROTECTED] > Subject: RE: Network Setup Opinion Needed > > On Tue, 30 Sep 2003, Otto Haliburton wrote: > > > Again the problem is not the 50 ip addresses, but how they are > connected. > > If they are all in the same area you have the problem of collisions and > the > > problem of increased traffic due to updating the routing tables for all > 50 > > nodes. Where as if you have smaller areas, one computer will be > arbitrated > > as the router in each area and the collisions will be less because of > the > > smaller areas. Having many computers in the same LAN is always a > problem > > with Ethernet. If you have many computers in the same area then token > ring > > is better because of the reduction of the collisions, but token ring > does > > not solve the routing table problem. > > This is not quite always the case. Ethernet's CSMA/CD (Carrier Sense > Multiple Access with Collision Detection) was invented during a time when > a hub or bus were the primary method of connection. Collision was indeed > a problem then, and keeping the LAN small was a way to ensure network > performance. > > However, these days, switches are much cheaper and are easily within the > reach of most organizations. > > If your users are hooked up to a switch instead of a hub, you can ignore > the "collisions problem", as it no longer exists. At that point, the > limiting factors are the speed/RAM of the gateway and the speed/RAM of the > switch. > > A good, short explanation can be found at > http://www.duxcw.com/faq/network/hubsw.htm > > > Ben > Actually CSMA/CD is the problem on a large single area network. I read the article and see the point. Here is the problem. When a node transmits it first listen for no traffic then it tries to transmit, if a collision occurs then it goes into an algorithm to make a attempt again after it selects it's new time slot, well the larger the number of nodes the greater the probability that they will select the same time slot and cause a collision again. Etc. etc .... Therefore large networks always bottle neck under Ethernet and that is why no company will place a large number of computers in the same area no matter what the transport medium is. There is always a optimum number that should be in an area before it is broken down. That's the theory.
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