1 1 00:00:00,500 --> 00:00:02,370 When we talk about network resources, 2 2 00:00:02,370 --> 00:00:04,670 we have to think about how data is being moved 3 3 00:00:04,670 --> 00:00:06,170 around the network. 4 4 00:00:06,170 --> 00:00:08,700 We break this down into two main models, 5 5 00:00:08,700 --> 00:00:11,550 the client/server model and the peer-to-peer model. 6 6 00:00:11,550 --> 00:00:14,200 Let's start out talking about the client/server model. 7 7 00:00:14,200 --> 00:00:16,920 The client/server model is going to use a dedicated server 8 8 00:00:16,920 --> 00:00:19,810 to provide access to files, scanners, printers, 9 9 00:00:19,810 --> 00:00:21,820 and other resources on the network. 10 10 00:00:21,820 --> 00:00:24,400 Now, administration and backup is pretty easy here 11 11 00:00:24,400 --> 00:00:26,970 because we have one central machine, the server, 12 12 00:00:26,970 --> 00:00:28,720 that all of the resources are sitting on. 13 13 00:00:28,720 --> 00:00:30,830 And so we can go ahead and back up that server 14 14 00:00:30,830 --> 00:00:32,570 and we've backed up all the files. 15 15 00:00:32,570 --> 00:00:33,650 We can configure that server 16 16 00:00:33,650 --> 00:00:35,730 and we've configured all the accesses, right? 17 17 00:00:35,730 --> 00:00:38,710 This makes the client/server model one of the main choices 18 18 00:00:38,710 --> 00:00:40,620 we use in business networks. 19 19 00:00:40,620 --> 00:00:43,340 Now, when we look at the benefits of a client/server model, 20 20 00:00:43,340 --> 00:00:45,700 it gives us that centralized administration. 21 21 00:00:45,700 --> 00:00:47,650 There is one or a few key servers 22 22 00:00:47,650 --> 00:00:49,690 where we can focus all of our effort there. 23 23 00:00:49,690 --> 00:00:50,990 That gives us easier management, 24 24 00:00:50,990 --> 00:00:53,500 again, because it's all in one or two places 25 25 00:00:53,500 --> 00:00:55,970 because we have those few key servers that we can manage. 26 26 00:00:55,970 --> 00:00:57,640 And it gives us better scalability 27 27 00:00:57,640 --> 00:00:59,920 because I can have all of my stuff in one place. 28 28 00:00:59,920 --> 00:01:01,150 And if I need to expand, 29 29 00:01:01,150 --> 00:01:03,690 I can actually expand outward using that 30 30 00:01:03,690 --> 00:01:04,840 through a cloud architecture 31 31 00:01:04,840 --> 00:01:06,520 or some other additional servers, 32 32 00:01:06,520 --> 00:01:08,000 depending on how I need to do that. 33 33 00:01:08,000 --> 00:01:09,600 And this will allow me to put things in tandem 34 34 00:01:09,600 --> 00:01:12,660 using load balancing, and it'll give me a lot more benefits 35 35 00:01:12,660 --> 00:01:15,490 than trying to run things under the peer-to-peer model. 36 36 00:01:15,490 --> 00:01:18,280 Now, some of those drawbacks to a client/server 37 37 00:01:18,280 --> 00:01:19,890 is that it costs more money 38 38 00:01:19,890 --> 00:01:21,850 because it requires dedicated hardware 39 39 00:01:21,850 --> 00:01:23,880 and dedicated operating system software. 40 40 00:01:23,880 --> 00:01:24,713 So you might have to have something 41 41 00:01:24,713 --> 00:01:26,730 like Windows 2016 on there, 42 42 00:01:26,730 --> 00:01:29,360 or a Unix or Linux build or something like that. 43 43 00:01:29,360 --> 00:01:31,570 And this takes a highly specialized skillset 44 44 00:01:31,570 --> 00:01:33,050 to run all of these things. 45 45 00:01:33,050 --> 00:01:35,550 And so it requires these dedicated resources, 46 46 00:01:35,550 --> 00:01:37,300 whether they're machines or software 47 47 00:01:37,300 --> 00:01:38,580 or that operating system, 48 48 00:01:38,580 --> 00:01:40,770 as well as personnel who know how to use it. 49 49 00:01:40,770 --> 00:01:42,120 So that's kind of the bad things 50 50 00:01:42,120 --> 00:01:44,140 when we talk about a client/server model. 51 51 00:01:44,140 --> 00:01:47,000 With all that said, client/server is still the leading model 52 52 00:01:47,000 --> 00:01:48,975 that we use in business networks. 53 53 00:01:48,975 --> 00:01:52,570 Now let's look at the other side, the peer-to-peer model. 54 54 00:01:52,570 --> 00:01:54,650 This is where peers or other machines, 55 55 00:01:54,650 --> 00:01:56,240 like laptops and desktops, 56 56 00:01:56,240 --> 00:01:58,660 can share resources together directly. 57 57 00:01:58,660 --> 00:02:01,150 The administration and backup is very difficult 58 58 00:02:01,150 --> 00:02:03,700 because all the files are located on different machines 59 59 00:02:03,700 --> 00:02:05,060 in different places. 60 60 00:02:05,060 --> 00:02:07,610 For example, if I wanted to share some PowerPoints with you 61 61 00:02:07,610 --> 00:02:09,610 and you're sharing some Excel files with me, 62 62 00:02:09,610 --> 00:02:11,720 these files are on both of our machines. 63 63 00:02:11,720 --> 00:02:13,540 And now we're going to have to back up both machines 64 64 00:02:13,540 --> 00:02:14,850 and manage both of them, 65 65 00:02:14,850 --> 00:02:17,010 and this is going to give us two sets of permissions on them 66 66 00:02:17,010 --> 00:02:18,650 and all of the other management. 67 67 00:02:18,650 --> 00:02:20,680 You see how this redundancy in that work. 68 68 00:02:20,680 --> 00:02:23,210 Where you have to do multiple things in multiple places. 69 69 00:02:23,210 --> 00:02:26,400 Now, if I took that and I scaled that up to 50 machines, 70 70 00:02:26,400 --> 00:02:28,430 that gets kind of being a nightmare, right? 71 71 00:02:28,430 --> 00:02:30,730 Because we're going to have a lot of work there. 72 72 00:02:30,730 --> 00:02:33,240 That's the big drawback to peer-to-peer. 73 73 00:02:33,240 --> 00:02:35,340 Now, where is peer-to-peer useful? 74 74 00:02:35,340 --> 00:02:37,370 Well, if you think back a decade ago, 75 75 00:02:37,370 --> 00:02:39,410 there was a software out there called Napster, 76 76 00:02:39,410 --> 00:02:42,100 and this was a peer to peer file sharing program. 77 77 00:02:42,100 --> 00:02:44,210 Now, it happened to be used for a lot of illegal activity, 78 78 00:02:44,210 --> 00:02:45,970 like downloading music without copyright 79 79 00:02:45,970 --> 00:02:47,130 and those types of things. 80 80 00:02:47,130 --> 00:02:50,080 But the concept behind it is what we want to focus on here. 81 81 00:02:50,080 --> 00:02:51,900 Each person who is part of the network 82 82 00:02:51,900 --> 00:02:53,590 gave and received files. 83 83 00:02:53,590 --> 00:02:55,610 It was a peer-to-peer sharing network. 84 84 00:02:55,610 --> 00:02:58,760 Now the benefits of peer-to-peer was it was low cost. 85 85 00:02:58,760 --> 00:03:01,440 There was no infrastructure, no specialized hardware, 86 86 00:03:01,440 --> 00:03:03,820 no dedicated hardware, none of that stuff, 87 87 00:03:03,820 --> 00:03:05,480 because there's just software 88 88 00:03:05,480 --> 00:03:07,280 and it allowed everyone to talk to each other 89 89 00:03:07,280 --> 00:03:09,480 as they wanted to and share files. 90 90 00:03:09,480 --> 00:03:11,280 You could pick a folder on your hard drive 91 91 00:03:11,280 --> 00:03:12,850 and share that out with the world. 92 92 00:03:12,850 --> 00:03:14,620 This allow you to create resources and networks 93 93 00:03:14,620 --> 00:03:16,010 wherever we wanted to. 94 94 00:03:16,010 --> 00:03:17,710 So this was kind of the thing here 95 95 00:03:17,710 --> 00:03:19,810 is that there was no specialized operating system, 96 96 00:03:19,810 --> 00:03:23,510 no dedicated resources, and it was very low to start up. 97 97 00:03:23,510 --> 00:03:24,820 Now, if I wanted to create a network 98 98 00:03:24,820 --> 00:03:26,200 and we had five computers, 99 99 00:03:26,200 --> 00:03:28,300 I might just turn one of them into a file sharing 100 100 00:03:28,300 --> 00:03:31,010 off my local laptop and you could all access it. 101 101 00:03:31,010 --> 00:03:31,920 It would be no problem. 102 102 00:03:31,920 --> 00:03:33,730 That's the idea of a peer-to-peer. 103 103 00:03:33,730 --> 00:03:35,400 But there's also some drawbacks 104 104 00:03:35,400 --> 00:03:37,410 because if my machine is off, 105 105 00:03:37,410 --> 00:03:39,230 now, you can't access anything. 106 106 00:03:39,230 --> 00:03:40,800 Whereas if I had a centralized server, 107 107 00:03:40,800 --> 00:03:42,860 you still could because that server would be on 108 108 00:03:42,860 --> 00:03:45,470 24 hours a day, seven days a week. 109 109 00:03:45,470 --> 00:03:47,200 Now, what are some of the drawbacks? 110 110 00:03:47,200 --> 00:03:49,940 Well, the biggest one is decentralized management. 111 111 00:03:49,940 --> 00:03:52,390 Everyone can own and control their own machine 112 112 00:03:52,390 --> 00:03:53,570 and decide what they're sharing 113 113 00:03:53,570 --> 00:03:55,060 and what they're not sharing. 114 114 00:03:55,060 --> 00:03:56,990 This becomes extremely inefficient 115 115 00:03:56,990 --> 00:03:59,510 when you deal with large networks or business networks. 116 116 00:03:59,510 --> 00:04:01,570 And it has horrible scalability. 117 117 00:04:01,570 --> 00:04:03,170 So if I wanted to run a peer-to-peer network 118 118 00:04:03,170 --> 00:04:05,160 for an organization the size of Facebook, 119 119 00:04:05,160 --> 00:04:06,460 it just wouldn't work. 120 120 00:04:06,460 --> 00:04:07,580 It would be horrible. 121 121 00:04:07,580 --> 00:04:09,750 You'd have to have centralized management for stuff. 122 122 00:04:09,750 --> 00:04:12,280 Otherwise, when things get large, they get lost. 123 123 00:04:12,280 --> 00:04:13,860 And so in business networks, 124 124 00:04:13,860 --> 00:04:15,270 we are really going to focus 125 125 00:04:15,270 --> 00:04:18,630 on this client/server model over peer-to-peer. 126 126 00:04:18,630 --> 00:04:20,430 For the exam, you do want to understand 127 127 00:04:20,430 --> 00:04:23,290 what a client/server model is and a peer-to-peer model, 128 128 00:04:23,290 --> 00:04:25,440 and really, what the benefits and drawbacks are 129 129 00:04:25,440 --> 00:04:26,480 for each of them. 130 130 00:04:26,480 --> 00:04:28,520 All the benefits on the client/server model, 131 131 00:04:28,520 --> 00:04:30,310 are drawbacks on peer-to-peer 132 132 00:04:30,310 --> 00:04:32,270 and all the drawbacks on client/server model 133 133 00:04:32,270 --> 00:04:34,200 are actually benefits on peer-to-peer. 134 134 00:04:34,200 --> 00:04:35,990 They're basically opposites of each other. 135 135 00:04:35,990 --> 00:04:38,490 If you remember that, you'll do great on the exam.