All language subtitles for 3. Answers Part 2 Broadcast and Collision domains

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These are the user uploaded subtitles that are being translated: 1 00:00:19,720 --> 00:00:27,450 We can also answer this question How many broadcast domains are they in network one. 2 00:00:27,570 --> 00:00:35,700 So if I go back all the way to the original OP message and then click capture forward the OP a message 3 00:00:35,690 --> 00:00:39,060 is sent to the Hub. 4 00:00:39,090 --> 00:00:42,580 Notice it's a broadcast at or layer two. 5 00:00:42,600 --> 00:00:53,730 So what happens to broadcast traffic it gets flooded so we have one broadcast domain because I broadcast 6 00:00:53,790 --> 00:00:58,120 sent to a hub is flooded. 7 00:00:58,910 --> 00:01:03,390 So single broadcast domain in network one 8 00:01:06,380 --> 00:01:15,140 we can also prove that by rerunning a simulation so let's rerun the simulation. 9 00:01:15,260 --> 00:01:24,620 I'm only going to look at AAP and ICMP traffic but on P.S. 1 what I'm going to do now is send a broadcast 10 00:01:24,680 --> 00:01:35,900 to 10 1 1 255 so this is a broadcast I'll only send two packets notice the broadcast traffic is sent 11 00:01:35,930 --> 00:01:48,800 to the hub when we look at the packet source address is P.S. 1 we can see that again by looking at the 12 00:01:48,860 --> 00:01:50,480 MAC address. 13 00:01:50,480 --> 00:01:56,610 So notice the MAC address is P.S. 1 destination is a broadcast. 14 00:01:56,960 --> 00:02:05,780 So the destination MAC address is set to that destination IP address is set to a broadcast 255 255 255 15 00:02:06,370 --> 00:02:07,500 in Packet Tracer. 16 00:02:07,700 --> 00:02:14,850 Source IP address is P.S. 1 Notice the broadcast goes to everyone. 17 00:02:14,850 --> 00:02:23,320 So it's a single broadcast domain these devices will reply back but the traffic is flooded out of all 18 00:02:23,320 --> 00:02:24,370 ports. 19 00:02:24,370 --> 00:02:33,920 Notice we're getting a collision here so recent of the simulation and let's look at another problem 20 00:02:35,170 --> 00:02:51,380 if P.S. 1 sends a ping to P.C. for and P.S. 2 sends a ping to P.C. for what's going to happen so they 21 00:02:51,380 --> 00:02:54,530 both sending packets into the network 22 00:02:57,990 --> 00:02:58,760 in this example. 23 00:02:58,760 --> 00:03:12,790 P.S. to send an OP because it doesn't know the MAC address of P.S. For so here's the actual frame. 24 00:03:13,030 --> 00:03:22,270 A quick recap of terminology to be precise and to be correct for the CCMA exam and to leave one in the 25 00:03:22,270 --> 00:03:23,460 OSA model. 26 00:03:23,560 --> 00:03:31,630 We talk about butts at least two in the US eye model we talk about friends and to layer three we talk 27 00:03:31,630 --> 00:03:39,400 about packets and at least four we talk about segments and then we typically talk about the data at 28 00:03:39,400 --> 00:03:41,050 higher layers. 29 00:03:41,050 --> 00:03:48,520 I'm often using terms interchangeably here but if you want to be very precise about terminology at a 30 00:03:48,520 --> 00:03:56,110 later one it puts a layer to its frames Layer 3 its packets at layer for its segments. 31 00:03:56,110 --> 00:04:00,990 So notice another layer to the frame has a destination address of a broadcast. 32 00:04:03,350 --> 00:04:09,980 That's causing problems with the frame that was sent by P.S. 1. 33 00:04:10,040 --> 00:04:17,660 We've got a collision taking place here so there's a problem with the frames because of the collisions 34 00:04:18,770 --> 00:04:24,530 only one device can access the network at any time so here. 35 00:04:24,540 --> 00:04:31,260 P.S. 1 is sending the ICMP message and a reply is sent back to P.S. 1 36 00:04:34,180 --> 00:04:39,100 so run the simulation again before I do that. 37 00:04:39,100 --> 00:04:49,720 I'm going to make sure that P.S. To can ping P.S. 4 so make sure that it's OP cache is populated so 38 00:04:49,720 --> 00:04:50,670 both. 39 00:04:50,800 --> 00:05:02,770 P.S. To and P.S. 1 have P.S. fours MAC address in the OP cache and then what I'll do in simulation mode 40 00:05:03,550 --> 00:05:15,130 is get P.S. 1 to ping P.S. 4 and get P.S. To 2 ping P.S. 4 so they both can send an ICMP packet. 41 00:05:16,750 --> 00:05:20,470 When that hits the hub we have a collision. 42 00:05:20,860 --> 00:05:24,490 You have a single collision domain when you have a hub. 43 00:05:24,910 --> 00:05:31,830 So a hub is a single broadcast domain as well as a single collision domain. 44 00:05:31,870 --> 00:05:38,620 We're going to have problems with lots of collisions taking place as you add more and more devices to 45 00:05:38,620 --> 00:05:39,790 a hub. 46 00:05:39,790 --> 00:05:42,120 So be careful with hubs. 47 00:05:42,250 --> 00:05:50,320 They are single collision domains and single broadcast domains so we can save for questioning 11 network 48 00:05:50,320 --> 00:05:56,770 1 equals a single collision domain. 49 00:05:56,770 --> 00:06:06,160 Be careful using hubs today we don't use hubs in wide infrastructures we use switches which we'll see 50 00:06:06,160 --> 00:06:07,030 in a moment. 51 00:06:07,090 --> 00:06:09,430 Have multiple collision domains. 5318

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