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Now there was other issue with 10base2, the first issue is cable length
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the longer the cable the greater the signal degradation was.
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In other words as your cable increase in length the more likely it was
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that one host signal wouldn�t be received by another host.
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The host on one side of the cable might send the signal
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but because of degradation a host at the other end of the cable
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may not be able to receive or interpret the signal.
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Another problem is cable breaks.
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A cable break at any point would cause the entire network to fail.
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So if someone accidentally broke the cable at this point the whole network would fail.
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Host A cannot communicate with other devices in the network.
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those devices cannot communicate with host A
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However because of this cable break there�s no terminator on the cable.
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The cable is also damaged, so what happens is signals get reflected
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D might send a signal to C but it�s going to continue across the cable
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and then it�s going to be reflected back causing collisions on the network, so this
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network wasn�t very robust and that cable breaks to bring down the entire network.
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Now it gets worst, 10base2 implies 10Mbps Ethernet however, this is not 10Mbps for
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each device it's 10Mbps shared between all devices on that segment.
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In addition because of collisions you can only use between 30 and 40%.
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So you are only get 30 to 40% utilization.
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Collisions increased dramatically above that utilization
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so a conservative figure would be 30% utilization
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that means 10Mbps would be shared between all devices on that segment.
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So in this case we have 4 devices
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so that means the 10Mbps divided by 4 devices times 30% (10/4*30%)
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only gives you 0.75Mbps and not 10Mbps per device.
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This is not ideal because the bandwidth available to your PC
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is very low especially in a large network.
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So as more devices are added to the network
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the bandwidth available to each devices decreased
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this is also known as a single collision domain
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in other words, if a collision takes place at any point on the network
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all devices in this network are affected by that collision and would need to back off.
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