WEBVTT 1 00:00:00.040 --> 00:00:03.040 Ever get that feeling, you know when you're streaming your 2 00:00:03.040 --> 00:00:05.440 favorite show, printers humming along in the other room, and 3 00:00:05.480 --> 00:00:09.000 it's like invisible forces are making it all work, like some. 4 00:00:08.880 --> 00:00:11.480 Sort of digital magic show happening behind the scenes. 5 00:00:11.599 --> 00:00:14.919 Exactly. Well, today's deep dive, we're pulling back the curtain 6 00:00:15.119 --> 00:00:20.160 on that magic local area networks or lands for short. 7 00:00:20.600 --> 00:00:25.440 We've got excerpts from a Microsoft certification study guide Networking Fundamentals. 8 00:00:25.480 --> 00:00:28.239 As our trustee sidekick. Think of it as our decode 9 00:00:28.239 --> 00:00:29.399 to ring for all things. 10 00:00:29.280 --> 00:00:31.079 Land, and don't worry, you don't need to be a 11 00:00:31.120 --> 00:00:33.759 tech wizard to follow along. We're going to break down 12 00:00:33.759 --> 00:00:35.920 the basics so you can impress your friends with your 13 00:00:35.960 --> 00:00:37.200 newfound network knowledge. 14 00:00:37.320 --> 00:00:40.079 Love it So, Land's one oh one. Our guide defines 15 00:00:40.119 --> 00:00:43.000 a land as two or more computers exchanging data within 16 00:00:43.039 --> 00:00:46.079 a small area. Okay, it sounds simple enough, but paint 17 00:00:46.159 --> 00:00:48.200 me a picture. What does that actually look like? And 18 00:00:48.240 --> 00:00:50.240 say my house, Well, picture this. 19 00:00:50.320 --> 00:00:53.399 You're at home, laptop fired up, scrolling through your favorite 20 00:00:53.399 --> 00:00:57.039 social media. Meanwhile, your housemate's streaming a movie and your 21 00:00:57.079 --> 00:01:00.200 smart fridge is sending silent updates to your phone. All 22 00:01:00.200 --> 00:01:04.319 those devices seamlessly connected, sharing data and resources. That's your home, 23 00:01:04.439 --> 00:01:05.079 land and action. 24 00:01:05.439 --> 00:01:08.000 So it's not just about computers. It's about anything with 25 00:01:08.040 --> 00:01:10.000 the digital pulse, basically exactly. 26 00:01:10.040 --> 00:01:12.439 And it's not just confined to your home. Think about 27 00:01:12.439 --> 00:01:15.879 your office as school campus, even your local coffee shop 28 00:01:15.920 --> 00:01:18.840 with its Wi Fi network. Those are all examples of 29 00:01:18.959 --> 00:01:21.959 lands connecting devices and enabling collaboration. 30 00:01:22.680 --> 00:01:26.400 Okay, starting to see the bigger picture here. So how 31 00:01:26.439 --> 00:01:29.000 does it all actually work? What's going on under the 32 00:01:29.040 --> 00:01:32.840 hood to make this digital orchestra play in harmony? 33 00:01:32.920 --> 00:01:35.879 Well let's pop the hood, shall we. Our guidebook walks 34 00:01:35.920 --> 00:01:38.760 us through the key components of a land. First up, 35 00:01:38.799 --> 00:01:42.120 we have network adapters. Think of these as the entry 36 00:01:42.120 --> 00:01:44.879 pass to the network party. They're built into your devices, 37 00:01:44.920 --> 00:01:46.840 allowing them to speak the language of the network. 38 00:01:46.920 --> 00:01:48.599 So no adapter, no party invite. 39 00:01:48.680 --> 00:01:51.640 You got it. Now, imagine a bustling party. You've got guests, 40 00:01:52.079 --> 00:01:54.719 Your device is mingling, but they need someone to direct 41 00:01:54.760 --> 00:01:57.920 the flow of conversations and snacks. Right, That's where central 42 00:01:57.920 --> 00:02:01.359 connecting devices come in. The book mentioned hubs, switches, and routers. 43 00:02:01.359 --> 00:02:04.120 Okay, those sound familiar, but I'll admit I get them 44 00:02:04.120 --> 00:02:06.280 all mixed up late. An on me, which one's the 45 00:02:06.319 --> 00:02:08.159 life of the party, and which one's just there for 46 00:02:08.199 --> 00:02:09.840 the chips A dip great analogy. 47 00:02:09.919 --> 00:02:12.960 Think of a hub like that friend who tells everyone everything, 48 00:02:13.080 --> 00:02:15.960 even if it's not relevant. It's simple, but not very efficient. 49 00:02:16.759 --> 00:02:19.039 A switch, on the other hand, is like that friend 50 00:02:19.080 --> 00:02:21.639 who knows everyone and can discreetly connect you with the 51 00:02:21.639 --> 00:02:24.719 person you need to talk to. It directs data packets 52 00:02:24.759 --> 00:02:27.919 only to the intended recipients, making the network much faster. 53 00:02:28.840 --> 00:02:32.159 Okay, so the switch is the strategic networker. What about 54 00:02:32.199 --> 00:02:33.439 the router? Where does it fit in? 55 00:02:33.479 --> 00:02:36.400 Ah, the router that's your friend with the connections. Literally, 56 00:02:36.639 --> 00:02:39.159 it acts as a gateway between your land and the 57 00:02:39.240 --> 00:02:41.879 vast expanse of the Internet. Think of it as the 58 00:02:41.960 --> 00:02:45.039 bouncer at the party, controlling who and what comes in 59 00:02:45.080 --> 00:02:46.120 and out of your network. 60 00:02:46.520 --> 00:02:49.319 Makes sense. So we've got our adapters, our party organizers, 61 00:02:49.319 --> 00:02:51.800 and our Internet gateway. What else are we missing? 62 00:02:52.159 --> 00:02:54.680 Well, no party is complete without some good music. Right 63 00:02:54.759 --> 00:02:57.800 in a land. The music is the data flowing through cables. 64 00:02:57.840 --> 00:03:01.039 The physical pathways of your network are our guidebook highlights 65 00:03:01.120 --> 00:03:04.240 twisted pair cables with RJ forty five connectors. You know 66 00:03:04.280 --> 00:03:06.400 that thing we always struggle to plug in the right way. 67 00:03:06.560 --> 00:03:08.520 Well, tell me about it. But seriously, why all the 68 00:03:08.560 --> 00:03:10.560 twists and turns in those cables. Is it just to 69 00:03:10.560 --> 00:03:11.719 make our lives difficult? 70 00:03:11.919 --> 00:03:15.319 Not at all. Those twists actually help reduce interference and 71 00:03:15.439 --> 00:03:18.800 ensure data integrity. And here's a fun fact from the book. 72 00:03:19.039 --> 00:03:22.000 Those cables have a length limit. You can only stretch 73 00:03:22.039 --> 00:03:25.240 them about one hundred meters before the signal starts getting weak. 74 00:03:25.520 --> 00:03:28.759 Really, so there are limits to this digital party. 75 00:03:28.879 --> 00:03:32.039 Absolutely, think about it. The further the data has to travel, 76 00:03:32.439 --> 00:03:35.759 the weaker the signal gets. That's why larger networks often 77 00:03:35.879 --> 00:03:40.000 use devices called repeaters to amplify the signal over longer distances. 78 00:03:40.520 --> 00:03:44.159 Interesting, it's like having rest stops along the information super 79 00:03:44.240 --> 00:03:45.280 Highway exactly. 80 00:03:45.479 --> 00:03:47.960 Now, imagine you're trying to send a message to someone 81 00:03:48.039 --> 00:03:51.919 at this massive party. You need to know their exact location, right. 82 00:03:52.120 --> 00:03:54.599 That's where IP addresses come in. Our guide calls them 83 00:03:54.599 --> 00:03:55.759 your digital street address. 84 00:03:55.759 --> 00:03:57.800 Okay, that makes sense, But instead of houses, we're talking 85 00:03:57.840 --> 00:03:59.199 about devices on a network. 86 00:03:59.240 --> 00:04:00.919 You got it. Just like your home address tells us 87 00:04:00.919 --> 00:04:03.280 where to find you, an IP address pinpoints the device 88 00:04:03.319 --> 00:04:04.000 on a network. 89 00:04:04.080 --> 00:04:06.000 So is that why no two devices can have the 90 00:04:06.039 --> 00:04:08.360 same IP address, just like, you can't have two houses 91 00:04:08.400 --> 00:04:10.520 with the same address spot on. 92 00:04:10.680 --> 00:04:13.120 That would be an IP conflict and it would cause 93 00:04:13.199 --> 00:04:15.759 all sorts of communication chaos on your network. It'd be 94 00:04:15.800 --> 00:04:18.800 like sending a letter to one twenty three Main Street, 95 00:04:19.600 --> 00:04:22.480 but two houses have that same address. Total confusion. 96 00:04:22.519 --> 00:04:24.800 Okay, So how do we keep our digital addresses straight 97 00:04:24.920 --> 00:04:26.160 and avoid those conflicts? 98 00:04:26.240 --> 00:04:28.720 That's where things get a bit more technical. Our guidebook 99 00:04:28.800 --> 00:04:32.240 delves into the structure of IP addresses, breaking them down 100 00:04:32.279 --> 00:04:34.319 into a network portion and a host portion. 101 00:04:34.519 --> 00:04:36.600 Okay, so like the network portion is the street name 102 00:04:36.879 --> 00:04:38.920 and the host portion is the specific house. 103 00:04:38.800 --> 00:04:42.279 Number, a perfect analogy. The network portion tells us which 104 00:04:42.319 --> 00:04:46.079 network the device belongs to, and the host portion identifies 105 00:04:46.160 --> 00:04:48.319 that specific device within the network. 106 00:04:48.519 --> 00:04:50.879 And to make sure we're reading those addresses correctly, we 107 00:04:50.959 --> 00:04:52.519 have something called subnet masks. 108 00:04:52.839 --> 00:04:55.160 Right. They're like those helpful signs that tell you which 109 00:04:55.160 --> 00:04:58.480 houses are on which block. They tell computers which part 110 00:04:58.480 --> 00:05:01.040 of the IP address is the network and which part 111 00:05:01.120 --> 00:05:02.240 is the device address. 112 00:05:02.319 --> 00:05:04.360 Okay, this is all starting to click. So we've got 113 00:05:04.600 --> 00:05:08.079 our devices with their unique IP addresses, all connected through 114 00:05:08.079 --> 00:05:11.920 cables and managed by those central connecting devices. It's like 115 00:05:11.959 --> 00:05:14.519 a well organized digital city. 116 00:05:13.959 --> 00:05:17.160 Exactly, and just like a city has different neighborhoods, lands 117 00:05:17.199 --> 00:05:19.519 can be set up in various ways, using different types 118 00:05:19.560 --> 00:05:23.040 of cables and connections. Some networks are wired, relying on 119 00:05:23.079 --> 00:05:26.800 those trusty Ethernet cables we talked about, while others are wireless, 120 00:05:26.879 --> 00:05:28.759 using radio waves to transmit data. 121 00:05:29.120 --> 00:05:32.879 Ah, the age old debate wired versus wireless is one 122 00:05:32.920 --> 00:05:34.199 inherently better than the other. 123 00:05:34.560 --> 00:05:37.600 It really depends on your needs and priorities. Our guidebook 124 00:05:37.680 --> 00:05:40.600 points out the strengths and weaknesses of both. Wired networks, 125 00:05:40.600 --> 00:05:43.839 like those using Ethernet cables, are known for their reliability 126 00:05:43.879 --> 00:05:47.800 and speed. They're less prone to interference and offer consistent performance, 127 00:05:48.040 --> 00:05:51.160 which is great for things like streaming high definition videos 128 00:05:51.279 --> 00:05:54.160 or online gaming where every millisecond counts. 129 00:05:54.199 --> 00:05:56.839 So if I'm settling in for a movie marathon, wired 130 00:05:56.920 --> 00:05:57.399 is the way to. 131 00:05:57.360 --> 00:06:00.040 Go, exactly now. Wireless networks, on the other hand, we 132 00:06:00.040 --> 00:06:02.439 give you the freedom to roam around without being tethered 133 00:06:02.439 --> 00:06:06.240 to a cable. This is perfect for casual browsing, checking emails, 134 00:06:06.560 --> 00:06:09.079 or connecting your smartphone and tablet to the network. 135 00:06:09.399 --> 00:06:12.639 Convenience and mobility, got it, But what about security? Isn't 136 00:06:12.680 --> 00:06:16.480 it riskier to transmit data wirelessly, and couldn't someone just 137 00:06:16.480 --> 00:06:18.600 snoop on my signal and steal all my CAF videos. 138 00:06:18.839 --> 00:06:21.600 That's a great question, and one will definitely dig into 139 00:06:21.759 --> 00:06:24.199 more deeply later on, but for now, let's just say 140 00:06:24.240 --> 00:06:28.839 that both wired and wireless networks have their own security considerations. 141 00:06:28.920 --> 00:06:32.759 Hi, Cliffhanger, I'm hooked. So we've covered the basic building 142 00:06:32.759 --> 00:06:35.839 blocks of lands, the devices, the connections, the addresses, But 143 00:06:35.879 --> 00:06:37.920 I have a feeling there's a lot mortal uncover, right. 144 00:06:38.040 --> 00:06:42.240 Oh, absolutely, we've just scratched the surface of this fascinating world. 145 00:06:42.319 --> 00:06:44.480 In the next part of our deep dive, we'll delve 146 00:06:44.519 --> 00:06:47.519 into the different ways lands are organized, explore the crucial 147 00:06:47.600 --> 00:06:50.480 role of security, and even unravel the mysteries of the 148 00:06:50.519 --> 00:06:51.720 OSI model. 149 00:06:51.720 --> 00:06:54.519 The OSI what now sounds intriguing, don't miss the next 150 00:06:54.519 --> 00:06:57.360 part of our land adventure, where we'll continue to decode 151 00:06:57.399 --> 00:07:00.399 the digital world, one layer at a time. Them back 152 00:07:00.439 --> 00:07:02.319 to the land party. Last time, we were wiring up 153 00:07:02.319 --> 00:07:05.800 our network, assigning digital addresses, and debating the merits of 154 00:07:05.920 --> 00:07:08.040 cables versus Wi Fi freedom. 155 00:07:07.720 --> 00:07:10.319 And we left off with a tantalizing question, how do 156 00:07:10.360 --> 00:07:13.480 you keep this digital party from getting crashed. Security, my friend, 157 00:07:13.560 --> 00:07:14.240 is where it's at. 158 00:07:14.639 --> 00:07:17.759 Music to my ears because frankly, the idea of someone 159 00:07:17.800 --> 00:07:21.319 sneaking to my network and stealing my meticulously curated cat 160 00:07:21.399 --> 00:07:24.199 meme folder, well, that keeps me up at night. 161 00:07:24.319 --> 00:07:27.839 I hear you. Fortunately, our guidebook is full of security strategies. 162 00:07:27.879 --> 00:07:30.639 First up, the DMZ or demilitarized zone. 163 00:07:30.720 --> 00:07:33.000 Okay, hold up, DMZ. That sounds like something out of 164 00:07:33.000 --> 00:07:34.879 a war movie, not my home network. 165 00:07:35.160 --> 00:07:38.000 It does sound intense, but it's more about strategy than 166 00:07:38.040 --> 00:07:41.519 actual warfare. Imagine your land as a medieval castle. You 167 00:07:41.519 --> 00:07:44.800 wouldn't want just anyone strolling through the main gate, right, 168 00:07:44.839 --> 00:07:47.600 You'd have an outer wall, a buffer zone. That's your DMZ. 169 00:07:47.879 --> 00:07:49.759 So instead of a moat and drawbridge, we have a 170 00:07:49.800 --> 00:07:50.879 DMZ exactly. 171 00:07:50.920 --> 00:07:53.600 It's a separate network segment that sits between your land 172 00:07:53.639 --> 00:07:56.040 and the Internet. You can put things there that need 173 00:07:56.079 --> 00:07:58.439 to be accessible from the outside, like a web server, 174 00:07:58.800 --> 00:08:00.680 without exposing your entire network. 175 00:08:00.759 --> 00:08:04.959 Okay, So it's like a security checkpoint, carefully screening who 176 00:08:05.079 --> 00:08:08.240 gets access to the inner sanctum of my precious cat. 177 00:08:08.040 --> 00:08:12.279 Memes precisely, and guarding that checkpoint. We have firewalls, the 178 00:08:12.480 --> 00:08:15.600 unsung heroes of network security. They inspect every piece of 179 00:08:15.680 --> 00:08:18.319 data coming in and out, blocking anything that looks suspicious. 180 00:08:18.360 --> 00:08:20.839 Think of them like digital bouncers, only these guys never 181 00:08:20.879 --> 00:08:21.480 take bribes. 182 00:08:21.639 --> 00:08:25.160 Good to know. But let's not forget those internal network parties. 183 00:08:25.920 --> 00:08:29.360 How do larger lands keep things organized when you have 184 00:08:29.879 --> 00:08:33.440 potentially hundreds of devices all trying to share the same 185 00:08:33.519 --> 00:08:34.240 digital space. 186 00:08:34.600 --> 00:08:36.960 Excellent point. Just like you wouldn't throw a massive party 187 00:08:36.960 --> 00:08:41.559 in a tiny studio apartment, large networks need structure. Remember 188 00:08:41.600 --> 00:08:44.360 those central connecting devices we talked about, hubs and switches 189 00:08:44.360 --> 00:08:47.480 and bigger lands. They don't just connect individual devices, they 190 00:08:47.480 --> 00:08:50.559 connect entire groups of devices in a hierarchical structure. 191 00:08:50.840 --> 00:08:52.879 So it's like building a digital office building. 192 00:08:53.200 --> 00:08:56.320 Perfect analogy. Each floor could represent a different department, and 193 00:08:56.360 --> 00:08:58.960 each department has its own network segment connected by a 194 00:08:59.000 --> 00:09:01.759 hub or switch, And just like an office building needs 195 00:09:01.759 --> 00:09:04.879 a main power source, all these smaller segments are ultimately 196 00:09:04.879 --> 00:09:08.360 connected to a core switch, creating a highly organized and 197 00:09:08.399 --> 00:09:09.320 efficient network. 198 00:09:09.879 --> 00:09:12.120 That makes sense, But what happens if the power goes 199 00:09:12.159 --> 00:09:14.200 out on our digital office building, or let's say that 200 00:09:14.240 --> 00:09:17.679 core switch decides to take an unexpected vacation. Does the 201 00:09:17.840 --> 00:09:19.000 entire network go down. 202 00:09:19.360 --> 00:09:22.279 That, my friend, is the dreaded single point of failure. 203 00:09:22.919 --> 00:09:27.919 If that central component fails, it can disrupt the entire network. 204 00:09:28.080 --> 00:09:30.879 It's like having all your eggs in one digital basket. 205 00:09:31.120 --> 00:09:33.279 That's why network engineers spend a lot of time thinking 206 00:09:33.320 --> 00:09:35.320 about redundancy and backup systems. 207 00:09:35.879 --> 00:09:38.399 So, just like in the real world, backups are crucial 208 00:09:38.399 --> 00:09:41.440 in the digital one too. But let's oom out even further. 209 00:09:41.480 --> 00:09:43.960 We've been talking about the individual components and how they connect, 210 00:09:44.080 --> 00:09:47.039 but what about the overall layout of a network? Does 211 00:09:47.039 --> 00:09:47.519 that matter? 212 00:09:47.639 --> 00:09:51.960 Absolutely? The guidebook mentions network topologies, which might sound fancy, 213 00:09:52.000 --> 00:09:55.399 but it just refers to the arrangement of devices and connections. 214 00:09:55.799 --> 00:09:57.720 Think of it like a network's floor plan. 215 00:09:58.039 --> 00:10:00.759 Okay, so are there different floor plan offs? Is an 216 00:10:00.759 --> 00:10:04.120 open concept land better than a more compartmentalized one. There are? 217 00:10:04.159 --> 00:10:06.840 Indeed, each topology comes with its own pros, cons, and 218 00:10:06.919 --> 00:10:09.559 even a touch of drama. The book describes a few 219 00:10:09.600 --> 00:10:13.320 common ones. First up, the bust apology. Picture a single 220 00:10:13.360 --> 00:10:16.559 cable running through your digital office building and all the 221 00:10:16.639 --> 00:10:18.960 devices are connected to it like lights on a string. 222 00:10:19.039 --> 00:10:21.559 Simple, right, seems pretty straightforward. But also if that one 223 00:10:21.600 --> 00:10:23.519 cable goes out, it's lights out for everyone. 224 00:10:23.960 --> 00:10:27.360 Exactly one weak link and the whole system goes down. 225 00:10:27.360 --> 00:10:30.759 Plus everyone's sharing the same communication channel, which can lead 226 00:10:30.840 --> 00:10:34.840 to data collisions and slower speeds. Not exactly ideal for 227 00:10:34.960 --> 00:10:36.559 a bustling digital workplace. 228 00:10:36.679 --> 00:10:40.919 Okay, so bust apology not so great for large complex networks. Yeah, 229 00:10:40.960 --> 00:10:41.679 what else we got? 230 00:10:42.279 --> 00:10:45.759 Next? Up? We have the ring topology. Imagine those lights 231 00:10:45.799 --> 00:10:49.039 on a string now forming a circle. Each device has 232 00:10:49.120 --> 00:10:52.440 two connections, and data travels in one direction around the ring. 233 00:10:52.799 --> 00:10:55.360 More resilient than a single cable, I'd assume you bet. 234 00:10:55.360 --> 00:10:57.720 If one connection goes down, the data can usually take 235 00:10:57.720 --> 00:11:00.759 a detour and keep flowing. However, if a device fails, 236 00:11:00.759 --> 00:11:03.279 it can still disrupt the entire loop. It's a bit 237 00:11:03.320 --> 00:11:05.480 like a game of telephone. One wrong whisper and the 238 00:11:05.480 --> 00:11:06.480 message gets garbled. 239 00:11:06.559 --> 00:11:09.279 All right, So both bus and ring topologies have their weaknesses. 240 00:11:09.759 --> 00:11:10.960 Is there a more robust option? 241 00:11:11.360 --> 00:11:14.320 The most common one you'll encounter, especially in larger networks, 242 00:11:14.399 --> 00:11:18.360 is the star topology. Remember our digital office building. Now, 243 00:11:18.440 --> 00:11:21.840 imagine each device has its own dedicated cable connecting it 244 00:11:21.879 --> 00:11:23.840 directly to a central hub or switch. 245 00:11:24.639 --> 00:11:27.279 Ah, so it's like that hierarchical structure we discussed earlier, 246 00:11:27.279 --> 00:11:28.679 where everyone reports to the boss. 247 00:11:28.960 --> 00:11:33.039 Precisely, the Star topology is much more fault tolerant. If 248 00:11:33.080 --> 00:11:36.320 one device or connection goes down, it doesn't affect the 249 00:11:36.320 --> 00:11:38.840 rest of the network. Plus, it's easier to manage and 250 00:11:38.879 --> 00:11:42.279 troubleshoot because each device has its own dedicated connection. 251 00:11:42.480 --> 00:11:45.720 So the Star topology is like the well organized manager 252 00:11:45.879 --> 00:11:47.200 of the network world. 253 00:11:47.440 --> 00:11:50.720 You could say that now. The book also mentions hybrid topologies, 254 00:11:50.919 --> 00:11:54.559 which combine elements of different types to best suit and 255 00:11:54.639 --> 00:11:57.960 network's needs. It's like having an open concept office with 256 00:11:58.000 --> 00:12:01.200 some private meeting rooms for those confidential cat meme brain 257 00:12:01.279 --> 00:12:02.240 storing sessions. 258 00:12:02.799 --> 00:12:06.000 Love it. Okay, so we've explored these different layouts. But 259 00:12:06.039 --> 00:12:07.679 before we get too far, I want to circle back 260 00:12:07.679 --> 00:12:10.240 to those twisted pair cables we talked about earlier. The 261 00:12:10.279 --> 00:12:13.360 guidebook mentioned something about different standards and speeds. Can you 262 00:12:13.360 --> 00:12:14.240 break that down for us? 263 00:12:14.399 --> 00:12:17.720 Of course, Remember those cables are the backbone of wired networks, 264 00:12:17.759 --> 00:12:20.440 and just like any technology, they've evolved over time. 265 00:12:20.679 --> 00:12:23.200 So just like fashion, there are trends in network cables too. 266 00:12:23.639 --> 00:12:27.240 You could say that the guidebook highlights the importance of compatibility, 267 00:12:27.399 --> 00:12:30.519 which means everyone needs to be speaking the same Ethernet language. 268 00:12:30.720 --> 00:12:32.720 So just like you need the right adapter to join 269 00:12:32.759 --> 00:12:35.720 the network party, you need the right cable to transmit 270 00:12:35.799 --> 00:12:37.919 data effectively precisely. 271 00:12:37.960 --> 00:12:41.720 There are different Ethernet standards, each specifying different speeds and 272 00:12:41.759 --> 00:12:44.960 cable types. The most common one you'll likely encounter is 273 00:12:45.039 --> 00:12:47.960 one hundred base tie, which can handle data at a 274 00:12:48.000 --> 00:12:50.440 speed of up to one hundred megabits per second. 275 00:12:50.759 --> 00:12:52.679 That sounds pretty fast. Is that enough for my daily 276 00:12:52.679 --> 00:12:53.559 dose of cat videos? 277 00:12:53.559 --> 00:12:56.840 Oh? Absolutely, But if you're uploading a feature length cat 278 00:12:56.879 --> 00:13:00.879 themed documentary, you might want something even faster. That's where 279 00:13:00.919 --> 00:13:04.039 gigabit Ethernet comes in, handling speeds up to one gigabit 280 00:13:04.120 --> 00:13:05.600 per second, ten times faster. 281 00:13:05.799 --> 00:13:07.759 Wow, that's a whole lot of cat content flying through 282 00:13:07.759 --> 00:13:08.919 the airwaves. It is. 283 00:13:09.080 --> 00:13:12.440 And here's the cool part. The guidebook mentions that devices 284 00:13:12.480 --> 00:13:15.320 can actually negotiate these speeds, So even if you have 285 00:13:15.360 --> 00:13:18.200 a mix of older and newer devices with different capabilities, 286 00:13:18.399 --> 00:13:20.480 they can still communicate on the same network. 287 00:13:20.679 --> 00:13:23.360 That's amazing. So even if my old laptop is stuck 288 00:13:23.399 --> 00:13:25.519 in the slow lane, it can still connect with my 289 00:13:25.559 --> 00:13:26.360 super fast router. 290 00:13:26.840 --> 00:13:30.000 Exactly. They'll find a common speed and get the data flowing. Now, 291 00:13:30.240 --> 00:13:32.600 before we wrap up this part of our land exploration, 292 00:13:32.919 --> 00:13:35.320 there's one more crucial aspect. I want to highlight something. 293 00:13:35.360 --> 00:13:38.799 The book doesn't explicitly mention the human element. 294 00:13:39.080 --> 00:13:42.200 Oh right, Because as much as we love to anthropomorphize 295 00:13:42.200 --> 00:13:46.200 our devices, there are actual humans behind these networks making 296 00:13:46.240 --> 00:13:47.360 sure everything runs. 297 00:13:47.159 --> 00:13:51.159 Smoothly exactly, and humans, as we know, are not infallible. 298 00:13:51.200 --> 00:13:53.960 We make mistakes, we forget things, and sometimes we spill 299 00:13:53.960 --> 00:13:57.039 coffee on our routers. The point is, even the most 300 00:13:57.039 --> 00:13:59.600 carefully designed network can experience hiccups. 301 00:14:00.159 --> 00:14:02.879 Knowing how to troubleshoot is just as important as knowing 302 00:14:02.879 --> 00:14:04.480 how to set everything up in the first place. 303 00:14:04.559 --> 00:14:07.720 Absolutely. That's why understanding the basics of how lands work, 304 00:14:07.759 --> 00:14:11.120 the different components, topologies, and standards, is so empowering. It 305 00:14:11.159 --> 00:14:14.879 allows you to diagnose problems, optimize performance, and even design 306 00:14:14.879 --> 00:14:16.120 your own network setups. 307 00:14:16.200 --> 00:14:18.159 It's like having the power to be your own tech 308 00:14:18.159 --> 00:14:19.360 support exactly. 309 00:14:19.679 --> 00:14:23.120 The guidebook provides the foundational knowledge, but the real learning 310 00:14:23.159 --> 00:14:26.080 comes from applying that knowledge in real world situations, from 311 00:14:26.120 --> 00:14:29.279 setting up a home network to troubleshooting connectivity issues. 312 00:14:29.639 --> 00:14:32.639 Speaking of real world situations, it occurs to me that 313 00:14:32.720 --> 00:14:35.399 we've only scratched the surface of the vast and ever 314 00:14:35.399 --> 00:14:39.240 evolving landscape of lands. What other mysteries await us in 315 00:14:39.279 --> 00:14:40.679 the final part of our deep. 316 00:14:40.480 --> 00:14:43.759 Dive, my friend, we have saved the best for last. 317 00:14:43.879 --> 00:14:46.360 In the final part, will unravel the secrets of the 318 00:14:46.399 --> 00:14:51.039 OSI model, explore advanced concepts like cloud computing, and leave 319 00:14:51.080 --> 00:14:53.960 you with some thought provoking questions to ponder as you 320 00:14:54.000 --> 00:14:55.720 continue your land adventures. 321 00:14:55.879 --> 00:14:58.360 Don't touch that dial, folks, because things are about to 322 00:14:58.399 --> 00:15:02.159 get even more interesting. Welcome back, fellow network navigators. We've 323 00:15:02.200 --> 00:15:05.159 explored the land landscape, from those trusty cables to the 324 00:15:05.200 --> 00:15:07.039 strategic placement of firewalls. 325 00:15:07.200 --> 00:15:10.320 We've even dipped our toes into the art of network architecture, 326 00:15:10.600 --> 00:15:13.120 comparing different topologies and the importance of backups. 327 00:15:13.120 --> 00:15:15.519 But like any good heist movie, there's always one more 328 00:15:15.600 --> 00:15:16.440 layer to unravel. 329 00:15:16.720 --> 00:15:20.200 Indeed, and this one's a brain teaser. The OSI model. 330 00:15:20.279 --> 00:15:23.559 Okay, I'll be honest, The OSI model sounds a bit intimidating, 331 00:15:23.559 --> 00:15:25.679 like something my cat might drag in after battling a 332 00:15:25.759 --> 00:15:26.759 robot in the backyard. 333 00:15:27.360 --> 00:15:29.840 It does have a certain aura of mystery, doesn't it. 334 00:15:29.879 --> 00:15:31.840 But trust me, it's not as scary as it sounds. 335 00:15:32.240 --> 00:15:34.799 Think of the OSI model as a blueprint for how 336 00:15:34.919 --> 00:15:36.799 data travels across a network. 337 00:15:36.879 --> 00:15:39.519 Okay, so instead of a map of physical locations, it's 338 00:15:39.519 --> 00:15:41.960 a map of the data's journey precisely. 339 00:15:42.039 --> 00:15:46.000 Our TRUSTe guidebook describes it as seven distinct layers, each 340 00:15:46.080 --> 00:15:50.080 with a specific function. It's like a well coordinated relay race, 341 00:15:50.440 --> 00:15:53.480 with each runner passing the baton to the next, ensuring 342 00:15:53.519 --> 00:15:56.360 the data gets to its destination quickly and efficiently. 343 00:15:56.559 --> 00:15:59.960 So if one runner stumbles, the whole race is thrown off. 344 00:16:00.039 --> 00:16:02.399 Is that why? Understanding that different layers can help with 345 00:16:02.519 --> 00:16:03.720 troubleshooting exactly. 346 00:16:03.799 --> 00:16:05.879 Let's say you're trying to stream the latest cat themed 347 00:16:05.879 --> 00:16:09.519 reality show, but the video keeps buffering. Knowing which layer 348 00:16:09.559 --> 00:16:13.320 of the OSI model is responsible for, say, ensuring reliable 349 00:16:13.360 --> 00:16:16.600 data transmission, can help you pinpoint the culprit. Maybe it's 350 00:16:16.639 --> 00:16:18.480 a problem with your Wi Fi signal, which would fall 351 00:16:18.519 --> 00:16:20.919 under the physical layer, or perhaps it's an issue with 352 00:16:21.039 --> 00:16:23.679 how your router is directing traffic, which would be the 353 00:16:23.720 --> 00:16:24.440 network layer. 354 00:16:24.519 --> 00:16:26.960 So it's like having X ray vision into the network, 355 00:16:27.000 --> 00:16:29.440 allowing you to see where the bottlenecks or breakdowns. 356 00:16:29.000 --> 00:16:32.799 Are happening precisely now. The book delves into all seven layers, 357 00:16:33.279 --> 00:16:36.519 but for everyday land users, the most important ones to 358 00:16:36.600 --> 00:16:40.159 understand are the physical layer, the data link layer, and 359 00:16:40.279 --> 00:16:41.080 the network layer. 360 00:16:41.120 --> 00:16:43.200 All right, let's break those down. The physical layer one 361 00:16:43.240 --> 00:16:47.399 seems pretty self explanatory. We're talking cables, connectors, all the tangible. 362 00:16:47.000 --> 00:16:49.840 Stuff, right exactly. It's the foundation upon which all other 363 00:16:49.879 --> 00:16:52.919 communication layers are built. Think of it as the roads 364 00:16:52.919 --> 00:16:54.399 and bridges of the digital world. 365 00:16:54.519 --> 00:16:57.080 Makes sense. Then we have the data link layer, which, 366 00:16:57.159 --> 00:16:59.960 if I'm following correctly, is like the traffic cop makes 367 00:17:00.000 --> 00:17:03.519 making sure data gets to the right destination within a network. 368 00:17:03.639 --> 00:17:07.319 You've got this layer ensures that data is packaged correctly, 369 00:17:07.319 --> 00:17:11.039 addressed properly using those unique MBAD addresses we talked about earlier, 370 00:17:11.400 --> 00:17:15.000 and delivered to the intended recipient on the same network. 371 00:17:15.240 --> 00:17:18.200 It's like having a dedicated courier service for your data package. 372 00:17:18.200 --> 00:17:20.000 Okay, I'm starting to see how this all fits together. 373 00:17:20.039 --> 00:17:23.519 So we've got the physical infrastructure to data couriers, and 374 00:17:23.559 --> 00:17:24.880 then at the top of it all, we have the 375 00:17:24.920 --> 00:17:28.119 network layer, which is like the air traffic control, guiding 376 00:17:28.200 --> 00:17:29.960 data packets between different networks. 377 00:17:30.200 --> 00:17:34.000 A brilliant analogy. The network layer is where IP addresses 378 00:17:34.000 --> 00:17:36.759 come into play, ensuring that data packets can find their 379 00:17:36.799 --> 00:17:39.799 way across the vast expanse of the Internet or between 380 00:17:39.839 --> 00:17:42.960 different lands. It's like having a global positioning system for 381 00:17:43.039 --> 00:17:43.519 your data. 382 00:17:44.000 --> 00:17:46.559 Amazing And to think all of this is happening behind 383 00:17:46.559 --> 00:17:48.640 the scenes every time I click on a link or 384 00:17:48.759 --> 00:17:52.640 send an email, it's mind boggling. But speaking of sending emails, 385 00:17:52.920 --> 00:17:55.279 let's talk about how data is actually shared on a 386 00:17:55.359 --> 00:17:58.480 land We touched on client server and peer to peer 387 00:17:58.519 --> 00:18:01.559 models earlier, but are there other ways to share data 388 00:18:01.599 --> 00:18:02.759 in this digital age? 389 00:18:02.920 --> 00:18:06.599 Absolutely? Our guidebook focuses on those traditional models, but the 390 00:18:06.640 --> 00:18:10.480 world of technology never sleeps. One model that's becoming increasingly 391 00:18:10.559 --> 00:18:12.039 popular is cloud computing. 392 00:18:12.440 --> 00:18:14.559 Ah, yes, the cloud. Everyone's talking about it, but what 393 00:18:14.559 --> 00:18:16.920 does it actually mean for the average land user. 394 00:18:17.000 --> 00:18:19.480 Well, imagine, instead of storing all your files on your 395 00:18:19.519 --> 00:18:22.160 personal computer or a server in your home, you're storing 396 00:18:22.160 --> 00:18:24.799 them in a massive data center accessible from anywhere with 397 00:18:24.839 --> 00:18:27.880 an Internet connection. That's cloud computing in a nutshell. 398 00:18:27.960 --> 00:18:29.960 So it's like having a digital storage unit that I 399 00:18:30.000 --> 00:18:31.119 can access from anywhere in. 400 00:18:31.039 --> 00:18:35.119 The world exactly. And it's not just storage. Cloud computing 401 00:18:35.200 --> 00:18:38.720