All language subtitles for 5. Issues with 10base2, Collision domains

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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,000 --> 00:00:05,000 Now there was other issue with 10base2, the first issue is cable length 2 00:00:05,000 --> 00:00:10,000 the longer the cable the greater the signal degradation was. 3 00:00:10,000 --> 00:00:15,000 In other words as your cable increase in length the more likely it was 4 00:00:15,000 --> 00:00:19,000 that one host signal wouldn�t be received by another host. 5 00:00:19,000 --> 00:00:22,000 The host on one side of the cable might send the signal 6 00:00:22,000 --> 00:00:26,000 but because of degradation a host at the other end of the cable 7 00:00:26,000 --> 00:00:29,000 may not be able to receive or interpret the signal. 8 00:00:29,000 --> 00:00:32,000 Another problem is cable breaks. 9 00:00:32,000 --> 00:00:37,000 A cable break at any point would cause the entire network to fail. 10 10 00:00:37,000 --> 00:00:41,000 So if someone accidentally broke the cable at this point the whole network would fail. 11 11 00:00:41,000 --> 00:00:45,000 Host A cannot communicate with other devices in the network. 12 12 00:00:45,000 --> 00:00:48,000 those devices cannot communicate with host A 13 13 00:00:48,000 --> 00:00:54,000 However because of this cable break there�s no terminator on the cable. 14 14 00:00:54,000 --> 00:00:59,000 The cable is also damaged, so what happens is signals get reflected 15 15 00:00:59,000 --> 00:01:05,000 D might send a signal to C but it�s going to continue across the cable 16 16 00:01:05,000 --> 00:01:09,000 and then it�s going to be reflected back causing collisions on the network, so this 17 17 00:01:09,000 --> 00:01:15,000 network wasn�t very robust and that cable breaks to bring down the entire network. 18 18 00:01:15,000 --> 00:01:25,000 Now it gets worst, 10base2 implies 10Mbps Ethernet however, this is not 10Mbps for 19 19 00:01:25,000 --> 00:01:32,000 each device it's 10Mbps shared between all devices on that segment. 20 20 00:01:32,000 --> 00:01:38,000 In addition because of collisions you can only use between 30 and 40%. 21 21 00:01:38,000 --> 00:01:42,000 So you are only get 30 to 40% utilization. 22 22 00:01:42,000 --> 00:01:46,000 Collisions increased dramatically above that utilization 23 23 00:01:46,000 --> 00:01:50,000 so a conservative figure would be 30% utilization 24 24 00:01:50,000 --> 00:01:56,000 that means 10Mbps would be shared between all devices on that segment. 25 25 00:01:56,000 --> 00:01:58,000 So in this case we have 4 devices 26 26 00:01:58,000 --> 00:02:03,000 so that means the 10Mbps divided by 4 devices times 30% (10/4*30%) 27 27 00:02:03,000 --> 00:02:10,000 only gives you 0.75Mbps and not 10Mbps per device. 28 28 00:02:10,000 --> 00:02:15,000 This is not ideal because the bandwidth available to your PC 29 29 00:02:15,000 --> 00:02:19,000 is very low especially in a large network. 30 30 00:02:19,000 --> 00:02:22,000 So as more devices are added to the network 31 31 00:02:22,000 --> 00:02:25,000 the bandwidth available to each devices decreased 32 32 00:02:25,000 --> 00:02:29,000 this is also known as a single collision domain 33 33 00:02:29,000 --> 00:02:33,000 in other words, if a collision takes place at any point on the network 34 34 00:02:33,000 --> 00:02:38,000 all devices in this network are affected by that collision and would need to back off. 3498

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