WEBVTT 1 00:00:00.040 --> 00:00:03.080 All right, diving in. We're taking on take control of 2 00:00:03.160 --> 00:00:05.400 Wi Fi networking and security today. 3 00:00:05.639 --> 00:00:06.759 Oh this is a good one. 4 00:00:06.879 --> 00:00:09.560 It is. It's going to be awesome. And whether you 5 00:00:09.599 --> 00:00:12.960 consider yourself a tech wizard or maybe you're just like 6 00:00:13.119 --> 00:00:16.640 why does my Netflix keep buffering, understanding Wi Fi is 7 00:00:16.719 --> 00:00:18.199 surprisingly empowering. 8 00:00:18.239 --> 00:00:20.519 I think, yeah, it's true. I mean, so much of 9 00:00:20.559 --> 00:00:25.199 our digital lives hinges on this invisible network that's around 10 00:00:25.239 --> 00:00:27.000 us all the time, and we kind of take it 11 00:00:27.039 --> 00:00:28.120 for granted totally. 12 00:00:28.160 --> 00:00:29.679 And I feel like we do a lot of that 13 00:00:29.760 --> 00:00:32.079 in the tech world. But you know, I think today 14 00:00:32.079 --> 00:00:35.200 we're going to start really basic, like with the fundamentals 15 00:00:35.600 --> 00:00:39.679 like adapters, access points, gateways, right, the building blocks of 16 00:00:39.759 --> 00:00:42.200 every Wi Fi network. But I think instead of just 17 00:00:42.280 --> 00:00:44.640 like throwing the jargon at you, we're going to actually 18 00:00:44.719 --> 00:00:46.439 understand what's happening behind the scenes. 19 00:00:46.520 --> 00:00:50.240 Right, Yeah, Yeah, I think. I think one way to 20 00:00:50.240 --> 00:00:52.399 think about it is like every device that wants to 21 00:00:52.399 --> 00:00:54.200 connect to your Wi Fi network, whether it's your phone, 22 00:00:54.240 --> 00:00:56.679 your laptop, your smarts Speak or whatever, it's got this 23 00:00:56.719 --> 00:00:59.159 little WiFi doctor in it. It's like a tiny little 24 00:00:59.240 --> 00:01:03.159 radio receipt and transmitter and they're using radio waves believe 25 00:01:03.159 --> 00:01:07.159 it or not to send and receive data, and they 26 00:01:07.239 --> 00:01:09.400 all kind of communicate with this central hub, which is 27 00:01:09.400 --> 00:01:11.920 your access point, which we kind of know is the router. 28 00:01:12.120 --> 00:01:16.159 Okay. So when I'm sitting here streaming a movie on 29 00:01:16.200 --> 00:01:18.599 my laptop, what you're saying is that my laptop is 30 00:01:18.640 --> 00:01:22.079 sending radio signals to the router, and then the router 31 00:01:22.200 --> 00:01:24.640 is sending the movie data back to my laptop. 32 00:01:24.799 --> 00:01:28.879 Yeah, exactly through radioas and the router itself, right, is 33 00:01:28.879 --> 00:01:32.480 connected to the Internet through a gateway, right, and that's 34 00:01:32.599 --> 00:01:34.560 usually your modem. So the gateways kind of like the 35 00:01:34.560 --> 00:01:38.120 bridge between your internal Wi Fi network and then like 36 00:01:38.200 --> 00:01:39.599 the vast world of the Internet. 37 00:01:39.680 --> 00:01:41.319 Okay, that makes a lot of sense. I always get 38 00:01:41.359 --> 00:01:44.400 curious about this unlicensed spectrum thing. What is that exactly? 39 00:01:44.519 --> 00:01:48.079 Okay? So the radio frequencies that Wi Fi uses, right 40 00:01:48.400 --> 00:01:52.359 are unlicensed, and that means they're free for anyone to use, okay, 41 00:01:52.920 --> 00:01:56.519 but there are rules and regulations right governing how those 42 00:01:56.560 --> 00:02:00.239 frequencies are used. Okay, And because so many devices lie 43 00:02:00.239 --> 00:02:02.920 on Wi Fi these days, the airwaves, so to speak, 44 00:02:03.000 --> 00:02:04.079 can get a bit crowded. 45 00:02:04.200 --> 00:02:05.640 Oh yeah, I bet. So it's kind of like a 46 00:02:05.680 --> 00:02:07.319 digital highway at rush hour totally. 47 00:02:07.400 --> 00:02:09.840 Yeah, exactly, And that's where channels come in. You know, 48 00:02:10.280 --> 00:02:12.080 you can think of those as separate lanes on that 49 00:02:12.120 --> 00:02:15.319 digital highway, and you know, each channel operates on a 50 00:02:15.319 --> 00:02:19.000 slightly different frequency within that Wi Fi spectrum, and by 51 00:02:19.039 --> 00:02:22.479 carefully selecting which channel your network uses, you can minimize 52 00:02:22.520 --> 00:02:24.599 interference and optimize performance. 53 00:02:24.919 --> 00:02:27.039 So it's not just about getting a powerful router, then 54 00:02:27.080 --> 00:02:29.560 it's also about being on the right is it channel? 55 00:02:29.639 --> 00:02:33.400 It's okay, And speaking of routers, the book mentions Wi 56 00:02:33.400 --> 00:02:36.439 Fi standards. We've all seen these like ATO two point 57 00:02:36.479 --> 00:02:39.520 long AX or ATO two point lomanax, Like what do 58 00:02:39.599 --> 00:02:40.680 these actually mean? 59 00:02:40.840 --> 00:02:43.680 Yeah, that sounds like alphabet soup it does. But each 60 00:02:43.680 --> 00:02:46.800 of those standards represents like a significant advancement in Wi 61 00:02:46.800 --> 00:02:50.360 Fi technology, like ATO two point leven AXI, for example, 62 00:02:50.360 --> 00:02:53.759 that introduced faster data rates, wider channels, ATO two point 63 00:02:53.840 --> 00:02:56.479 lomanax or they call it Wi Fi six now introduce 64 00:02:56.520 --> 00:03:00.360 things like mu mimo and OFDMA to handle multiple devices 65 00:03:00.400 --> 00:03:01.000 more efficiently. 66 00:03:01.039 --> 00:03:04.240 Okay, So newer standards usually mean faster speeds and better 67 00:03:04.280 --> 00:03:05.479 performance generally. 68 00:03:05.560 --> 00:03:08.319 Yeah, but there's always a caveat. There are other factors 69 00:03:08.319 --> 00:03:12.680 to consider like compatibility for example. Ah, Okay, older devices 70 00:03:12.759 --> 00:03:15.680 might not support the latest Wi Fi standards, so you 71 00:03:15.719 --> 00:03:18.240 might need to choose a router that supports multiple standards 72 00:03:18.240 --> 00:03:19.639 to make sure that everything can connect. 73 00:03:19.879 --> 00:03:22.800 That's a good point. And speaking of choices, one of 74 00:03:22.840 --> 00:03:24.879 the big ones we face these days is whether to 75 00:03:24.919 --> 00:03:28.439 go with a traditional router an extender setup, or a 76 00:03:28.479 --> 00:03:31.639 newer mesh network. So what are the pros and cons 77 00:03:31.680 --> 00:03:32.439 of each approach? 78 00:03:32.960 --> 00:03:35.639 Okay, so traditional networks with your router and your extender 79 00:03:35.680 --> 00:03:38.280 can be a more budget friendly option, especially if you 80 00:03:38.319 --> 00:03:41.919 have like a smaller home or fewer devices, But they 81 00:03:41.919 --> 00:03:44.759 can be a bit more complex to set up and manage, 82 00:03:44.919 --> 00:03:47.560 and you might need to manually configure things like channel 83 00:03:47.560 --> 00:03:49.319 selection to optimize performance. 84 00:03:49.560 --> 00:03:51.479 Okay, so what about mesh networks then. 85 00:03:51.560 --> 00:03:54.400 So mesh networks are definitely the more user friendly option. 86 00:03:54.879 --> 00:03:58.360 They consist of multiple nodes that kind of seamlessly communicate 87 00:03:58.400 --> 00:04:01.759 with each other to create like a single unified network. 88 00:04:02.400 --> 00:04:04.520 They're great for larger homes or homes that have like 89 00:04:04.919 --> 00:04:08.599 complex layouts because they eliminate dead zones you know where 90 00:04:08.599 --> 00:04:10.599 the Wi Fi signal drops out right right? 91 00:04:11.159 --> 00:04:14.199 Yeah, So I imagine that ease of use, though it comes 92 00:04:14.199 --> 00:04:14.919 with the price tag. 93 00:04:15.000 --> 00:04:18.360 Probably it does. Mention networks tend to be more expensive 94 00:04:18.399 --> 00:04:21.439 than the traditional setups, especially if you need multiple nodes 95 00:04:21.480 --> 00:04:23.959 to cover like a large area. But you know, for 96 00:04:24.079 --> 00:04:27.040 many people, the convenience and the performance gains are worth 97 00:04:27.040 --> 00:04:27.800 the extra cost. 98 00:04:28.000 --> 00:04:30.240 So it really comes down to your budget, the size 99 00:04:30.240 --> 00:04:33.639 of your home, and how much like technical tinkering you're 100 00:04:33.639 --> 00:04:34.240 comfortable with. 101 00:04:34.480 --> 00:04:37.839 Yeah. Basically, you know there's no one size fits all 102 00:04:37.920 --> 00:04:40.959 solution when it comes to Wi Fi networking, but understanding 103 00:04:40.959 --> 00:04:43.079 the basics of how it all works can help you 104 00:04:43.079 --> 00:04:45.680 make a more informed decision that meets your specific needs. 105 00:04:45.920 --> 00:04:48.319 And speaking of informed decisions, there's a whole other layer 106 00:04:48.360 --> 00:04:50.439 to Wi Fi we haven't even touched on yet, and 107 00:04:50.480 --> 00:04:54.680 that's optimization. Just having the right equipment doesn't guarantee a 108 00:04:54.759 --> 00:04:57.120 smooth and fast connection, right right. 109 00:04:57.160 --> 00:04:59.560 It's true. Yeah, you can have the most powerful router 110 00:04:59.600 --> 00:05:02.319 in the world, but if you have poor channel selection 111 00:05:02.759 --> 00:05:06.040 or if you've got interference from neighboring networks, it could 112 00:05:06.040 --> 00:05:07.319 really cripple your performance. 113 00:05:08.160 --> 00:05:12.000 Okay, so before we move on to optimization and unleash 114 00:05:12.079 --> 00:05:15.079 the full potential of our Wi Fi, let's pause for 115 00:05:15.120 --> 00:05:17.040 a moment. And make sure we've got a solid grasp 116 00:05:17.120 --> 00:05:19.959 of the fundamentals. We've covered so far. We've talked about 117 00:05:20.000 --> 00:05:23.120 the basic components of Wi Fi network, the different Wi 118 00:05:23.120 --> 00:05:27.800 Fi standards, and the choices between traditional and mesh networks. 119 00:05:28.360 --> 00:05:29.959 Is there anything else we need to add to our 120 00:05:29.959 --> 00:05:32.319 Wi Fi toolbox before we move on to the next level. 121 00:05:32.560 --> 00:05:35.759 Yeah, I think we've I think we've got the essentials 122 00:05:35.800 --> 00:05:37.800 for now. I think once you kind of wrap your 123 00:05:37.800 --> 00:05:40.959 head around these core concepts, you're in a great You're 124 00:05:41.000 --> 00:05:42.839 in a good place to kind of master your Wi 125 00:05:42.879 --> 00:05:43.480 Fi domain. 126 00:05:43.600 --> 00:05:45.639 Okay, so we've built our Wi Fi foundation and now 127 00:05:45.639 --> 00:05:48.279 it's time to optimize it for peak performance. The book 128 00:05:48.279 --> 00:05:50.839 talks about channel selection being key. It seems like there's 129 00:05:50.879 --> 00:05:53.279 more to it than just picking a random number. 130 00:05:53.399 --> 00:05:57.160 Oh yeah, for sure. So you see, different channels operate 131 00:05:57.199 --> 00:06:01.279 on slightly different frequencies, and some frequencies are more prone 132 00:06:01.279 --> 00:06:04.480 to interference than others. If your network is using like 133 00:06:04.519 --> 00:06:06.959 a crowded channel, it's kind of like trying to have 134 00:06:07.040 --> 00:06:10.399 a conversation in a noisy room, Right, You're going to 135 00:06:10.480 --> 00:06:12.560 have a hard time getting your message across clearly. 136 00:06:12.720 --> 00:06:16.959 Yeah, that makes sense. So how do we find those 137 00:06:17.120 --> 00:06:20.439 quieter channels? How do we avoid all that digital noise? 138 00:06:21.120 --> 00:06:23.360 So there are tools and apps that can help you 139 00:06:23.399 --> 00:06:27.079 analyze the Wi Fi spectrum in your area and identify 140 00:06:27.160 --> 00:06:30.560 the least congested channels. You can think of them as 141 00:06:30.560 --> 00:06:32.639 like a like a radio scanner for Wi Fi. They 142 00:06:32.720 --> 00:06:35.199 show you all the networks in your vicinity and which 143 00:06:35.279 --> 00:06:36.480 channels they're using, so. 144 00:06:36.399 --> 00:06:38.600 We can actually see what our neighbor's WiFi is doing. 145 00:06:38.879 --> 00:06:41.000 That's pretty cool. Yeah, what if we live in an 146 00:06:41.000 --> 00:06:43.439 apartment building though, I mean there's tons of networks all 147 00:06:43.480 --> 00:06:44.519 crammed into one space. 148 00:06:44.639 --> 00:06:48.040 That's where things can get tricky. In densely populated areas, 149 00:06:48.319 --> 00:06:50.959 it can be difficult to find a completely clear channel. 150 00:06:51.360 --> 00:06:53.639 But even in those situations, you can usually find a 151 00:06:53.680 --> 00:06:56.360 channel that's less congested than others. You know, it's all 152 00:06:56.399 --> 00:07:00.639 about finding the best possible option, not necessarily the perfect one, right. 153 00:07:01.199 --> 00:07:03.319 And the book also mentions something about the two point 154 00:07:03.360 --> 00:07:06.199 four gigaherts and five gigahertz bands. What is the difference 155 00:07:06.240 --> 00:07:06.839 between the two? 156 00:07:07.000 --> 00:07:09.959 Yeah, so those refer to the two main frequency bands 157 00:07:09.959 --> 00:07:12.040 that are used by Wi Fi. The two point four 158 00:07:12.079 --> 00:07:15.279 gigahers band is older and it offers wider coverage. But 159 00:07:15.319 --> 00:07:18.360 it's also more prone to interference because it's older. The 160 00:07:18.399 --> 00:07:21.759 five gigorts band is newer, and it offers much faster speeds, 161 00:07:22.360 --> 00:07:24.480 but its signals don't travel as far. They have a 162 00:07:24.480 --> 00:07:25.439 shorter range. 163 00:07:25.720 --> 00:07:29.079 Okay, so if I want a stronger signal that can 164 00:07:29.160 --> 00:07:31.519 like reach the far corners of my house, I should 165 00:07:31.519 --> 00:07:33.759 stick with two point four gigaherts. But if I need 166 00:07:34.199 --> 00:07:37.759 blazing fast speeds for like gaming or streaming, I should 167 00:07:37.800 --> 00:07:39.079 go with five giarherts. 168 00:07:39.240 --> 00:07:41.240 Pretty much. Yeah, that's a good way to think about it. 169 00:07:41.319 --> 00:07:43.800 Okay, that makes sense, But this is a lot of information. 170 00:07:43.920 --> 00:07:46.120 All this optimization talk makes it sound like managing a 171 00:07:46.160 --> 00:07:49.240 Wi Fi network is like a full time job. Yeah, 172 00:07:49.279 --> 00:07:50.800 what about those of us who just kind of want 173 00:07:50.839 --> 00:07:53.839 things to work, you know, without having to tinker with 174 00:07:53.879 --> 00:07:55.079 all the settings all the time. 175 00:07:55.279 --> 00:07:57.720 I hear you. And that's one of the big advantages 176 00:07:57.800 --> 00:08:00.000 of those mesh networks that we were talking about earlier. 177 00:08:00.560 --> 00:08:03.480 They handle a lot of this optimization stuff automatically. They're 178 00:08:03.519 --> 00:08:08.040 constantly analyzing the network, adjusting channels, signal strengths to kind 179 00:08:08.040 --> 00:08:09.680 of maintain that optimal performance. 180 00:08:09.759 --> 00:08:12.480 Oh okay, so they're kind of like self driving cars 181 00:08:12.519 --> 00:08:14.439 for your Wi Fi pretty much chees set it and 182 00:08:14.480 --> 00:08:14.879 forget it. 183 00:08:15.079 --> 00:08:17.480 Yeah, they take a lot of the guesswork out of 184 00:08:17.519 --> 00:08:20.240 network management. But even if you have a mesh network, 185 00:08:20.759 --> 00:08:22.600 you know, it's still good to understand the basics of 186 00:08:22.639 --> 00:08:26.399 optimization just you can troubleshoot any issues that might come up. 187 00:08:26.519 --> 00:08:29.560 Right, Okay, so let's say we've optimized our network, we're 188 00:08:29.600 --> 00:08:33.120 on the right channels, everything is humming along smoothly. How 189 00:08:33.120 --> 00:08:36.559 do we actually know our network is performing at its 190 00:08:36.559 --> 00:08:38.240 best though? What are the signs? 191 00:08:38.320 --> 00:08:40.960 Yeah, that's a good question. So there are a few 192 00:08:41.080 --> 00:08:44.279 key metrics that you can use to assess your network performance. 193 00:08:45.200 --> 00:08:48.240 Data rate, for example, tells you how fast the data 194 00:08:48.320 --> 00:08:50.840 is being transferred between your devices and the router. 195 00:08:51.159 --> 00:08:54.120 Okay, so a higher data rate means faster downloads and 196 00:08:54.240 --> 00:08:55.720 smoother streaming exactly. 197 00:08:56.000 --> 00:08:58.919 And then there's signal strength, right, kind of self explanatory, 198 00:08:59.279 --> 00:09:01.600 but it indicates it's how strong the Wi Fi signal 199 00:09:01.679 --> 00:09:05.440 is at a particular location, and generally the stronger the signal, 200 00:09:05.679 --> 00:09:06.639 the better the connection. 201 00:09:07.000 --> 00:09:09.559 But signal strength isn't the only factor, right. The book 202 00:09:09.639 --> 00:09:11.320 mentions something called noise levels. 203 00:09:11.360 --> 00:09:15.200 That's right. Noise refers to any kind of interference that 204 00:09:15.279 --> 00:09:17.679 can disrupt the Wi Fi signal. Okay, it could be 205 00:09:17.679 --> 00:09:22.240 from other electronic devices, neighboring Wi Fi networks, even physical 206 00:09:22.240 --> 00:09:24.200 obstacles like walls or furniture. 207 00:09:24.320 --> 00:09:26.080 So you can have a strong signal, but if there's 208 00:09:26.080 --> 00:09:28.720 a lot of noise, it's still going to be hampered totally. 209 00:09:28.840 --> 00:09:30.840 Yeah. It's like trying to, you know, listen to a 210 00:09:30.840 --> 00:09:33.519 podcast in a crowded coffee shop, right, even if you're 211 00:09:33.519 --> 00:09:36.240 sitting right next to the speaker, all that background noise 212 00:09:36.240 --> 00:09:39.080 can make it really hard to hear clearly. 213 00:09:39.000 --> 00:09:41.639 Right Yeah. Okay, so we need to pay attention to 214 00:09:41.679 --> 00:09:44.679 both signal strength and the noise level. So how do 215 00:09:44.720 --> 00:09:46.360 we actually measure these things? 216 00:09:46.720 --> 00:09:50.120 So most routers have some built in tools that let 217 00:09:50.240 --> 00:09:53.679 you kind of monitor these metrics, and you can also 218 00:09:53.759 --> 00:09:57.039 use third party apps or websites that provide more detailed 219 00:09:57.120 --> 00:09:58.159 network analysis. 220 00:09:58.440 --> 00:10:01.600 Okay, so we can base get a health check up. 221 00:10:01.480 --> 00:10:03.799 For our Wi Fi exactly. Yeah, it's a good idea 222 00:10:03.840 --> 00:10:07.080 to check these metrics periodically, especially if you're experiencing any 223 00:10:07.399 --> 00:10:10.000 slow speeds or connection drops, just to kind of see 224 00:10:10.039 --> 00:10:10.559 what's going on. 225 00:10:10.679 --> 00:10:13.879 Okay, So this has all been great information for optimizing performance, 226 00:10:14.639 --> 00:10:16.919 but what about just the nuts and bolts of how 227 00:10:16.960 --> 00:10:18.840 our network is actually configured? 228 00:10:19.000 --> 00:10:22.519 Right, we're getting into the views hidden world of IP addresses, 229 00:10:23.000 --> 00:10:28.559 DHCP servers, na. These are the unsung heroes of network communication, 230 00:10:29.320 --> 00:10:32.879 working tirelessly behind the scenes to make sure that all 231 00:10:32.879 --> 00:10:35.519 your devices can connect and talk to the Internet. 232 00:10:35.720 --> 00:10:38.039 Okay, to be honest, those terms have always sounded a 233 00:10:38.039 --> 00:10:39.159 bit intimidating to me. 234 00:10:39.399 --> 00:10:41.039 I get it, I get it. They can seem a 235 00:10:41.039 --> 00:10:43.039 bit abstract. But let's break them down. I think, do 236 00:10:43.080 --> 00:10:44.000 you mystify them a little bit? 237 00:10:44.000 --> 00:10:46.159 Okay, Yeah, let's do that. Let's start with IP addresses. 238 00:10:46.240 --> 00:10:49.559 I know they're important, Yeah, but like, what exactly are they? 239 00:10:49.679 --> 00:10:53.000 Okay? So, think of an IP address as like a 240 00:10:53.120 --> 00:10:56.240 unique identifier for a device on a network. It's like 241 00:10:56.279 --> 00:10:59.080 a digital street address. It tells other devices where to 242 00:10:59.120 --> 00:11:01.799 send data. And when you connect to a Wi Fi network, 243 00:11:02.000 --> 00:11:04.879 your device is assigned an I address by the network's 244 00:11:05.080 --> 00:11:06.240 DHCP server. 245 00:11:06.519 --> 00:11:10.039 DHCP server another one of those terms. What is that? 246 00:11:10.159 --> 00:11:15.679 Yeah. DHCP stands for Dynamic Host Configuration Protocol Okay, and 247 00:11:16.039 --> 00:11:19.960 it's basically a service that automatically assigns IP addresses to 248 00:11:20.080 --> 00:11:22.480 devices on the network. This way, you don't have to 249 00:11:22.519 --> 00:11:25.440 like manually configure an IP address for each device you have, 250 00:11:25.480 --> 00:11:27.360 which would be a huge hassle. Right. 251 00:11:27.480 --> 00:11:29.600 Yeah, so it's kind of like a like a digital 252 00:11:29.639 --> 00:11:33.360 post office that's just assigning addresses to all the incoming mail. 253 00:11:33.600 --> 00:11:36.759 That's a great analogy. Yeah, Okay, the DHCP server make 254 00:11:36.799 --> 00:11:39.120 sure that every device on the network has a unique 255 00:11:39.120 --> 00:11:41.840 address so that they can all communicate with each other 256 00:11:42.039 --> 00:11:43.039 and with the Internet. 257 00:11:43.159 --> 00:11:45.600 Okay, that makes sense. What about NAT though, I've seen 258 00:11:45.600 --> 00:11:47.120 that term thrown around a lot, but I'm not really 259 00:11:47.120 --> 00:11:47.759 sure what it does. 260 00:11:47.799 --> 00:11:50.840 Okay, So NAT stands for a Network Address translation, and 261 00:11:50.879 --> 00:11:54.000 it's a very clever technique that allows multiple devices on 262 00:11:54.039 --> 00:11:57.360 your internal network to share a single public IP address. 263 00:11:57.480 --> 00:12:00.159 Wait, so my entire home network is sharing just one 264 00:12:00.240 --> 00:12:00.919 IP address? 265 00:12:01.000 --> 00:12:01.440 That's right. 266 00:12:01.480 --> 00:12:02.639 How does that even work? 267 00:12:02.720 --> 00:12:05.279 Okay, think of it this way. It's like having a 268 00:12:05.320 --> 00:12:08.679 mail room in an apartment building. Okay, all residents have 269 00:12:08.720 --> 00:12:12.240 their own individual apartment numbers, but the building itself has 270 00:12:12.240 --> 00:12:15.039 only one street address. Right. When you send a letter, 271 00:12:15.200 --> 00:12:18.000 you put your apartment number on the envelope, but the 272 00:12:18.000 --> 00:12:21.480 mail carrier only sees the building's address. Okay, yes, right, 273 00:12:21.559 --> 00:12:25.080 so NAT is like that mail room. It's translating between 274 00:12:25.080 --> 00:12:27.879 the internal IP addresses of all your devices and then 275 00:12:27.960 --> 00:12:31.320 that single public IP address that your network uses to 276 00:12:31.320 --> 00:12:32.159 talk to the Internet. 277 00:12:32.519 --> 00:12:35.879 So NAT is like that mailroom translating between our internal 278 00:12:35.919 --> 00:12:39.559 IP addresses and the single public IP address that our 279 00:12:39.600 --> 00:12:42.600 network uses exactly. Okay, it never occurred to me that 280 00:12:42.639 --> 00:12:46.840 our entire home network was operating behind a single IP address. 281 00:12:46.840 --> 00:12:48.519 So is there any downside to net? 282 00:12:48.639 --> 00:12:52.000 Yeah? So one potential drawback is that it can make 283 00:12:52.000 --> 00:12:54.320 it more difficult to set up certain types of services 284 00:12:54.519 --> 00:12:57.799 that require direct access to devices on your network from 285 00:12:57.799 --> 00:12:59.720 the Internet. Okay, like if you wanted to host a 286 00:12:59.759 --> 00:13:02.399 web site or game server, for example. 287 00:13:02.559 --> 00:13:04.639 So if I wanted to run a website for my 288 00:13:04.720 --> 00:13:07.759 home computer, NAT might make that a bit trickier. 289 00:13:07.879 --> 00:13:11.320 It can, Yeah, yeah, it can add some complexity, but 290 00:13:11.519 --> 00:13:14.320 there are ways to work around NET okay, such as 291 00:13:14.399 --> 00:13:16.320 port forwarding, which maybe we can get into. 292 00:13:16.200 --> 00:13:19.720 It wall right, that's good to know. So we've covered it, addresses, 293 00:13:19.919 --> 00:13:23.360 DHDP servers, and NAT. It's like we've peaked behind the 294 00:13:23.360 --> 00:13:26.600 curtain and seen like the inner workings of our network, 295 00:13:26.679 --> 00:13:27.440 and that's that. 296 00:13:27.399 --> 00:13:29.720 Can be really empowering. It gives you the knowledge to 297 00:13:30.159 --> 00:13:34.399 troubleshoot problems, optimize your network, even set up some more 298 00:13:34.440 --> 00:13:35.279 advanced features. 299 00:13:35.399 --> 00:13:38.240 Speaking of more advanced features, the book mentioned something called 300 00:13:38.320 --> 00:13:42.320 DHCP reservation, which sounds like a way to assign specific 301 00:13:42.399 --> 00:13:44.519 IP addresses to certain devices. 302 00:13:44.639 --> 00:13:47.879 Yeah. So, DHDP reservation lets you assign what they call 303 00:13:47.960 --> 00:13:51.320 a static IP address to a device, Okay, like a 304 00:13:51.320 --> 00:13:54.159 printer or a server, even though the rest of the 305 00:13:54.200 --> 00:13:57.240 devices on the network are getting their IP addresses dynamically. 306 00:13:57.279 --> 00:13:59.480 Okay, why would you want to do that? Doesn't the 307 00:13:59.559 --> 00:14:02.320 DHCP server handle all of that automatically. 308 00:14:02.559 --> 00:14:05.360 It does, But there are times when you might want 309 00:14:05.399 --> 00:14:08.600 a device to have a consistent IP address. For example, 310 00:14:08.639 --> 00:14:10.919 if you're setting up port forwarding to allow access to 311 00:14:10.960 --> 00:14:13.159 a device from the Internet, you need to know it's 312 00:14:13.200 --> 00:14:15.799 IP address so you can configure the router accordingly. 313 00:14:16.000 --> 00:14:18.879 Oh okay, so if I wanted to access my home 314 00:14:18.919 --> 00:14:21.200 security camera remotely, I would need to give it a 315 00:14:21.240 --> 00:14:25.039 static IP address using DHDP reservation exactly. 316 00:14:24.919 --> 00:14:27.279 That way, you can be sure that the camera's IP 317 00:14:27.320 --> 00:14:29.840 address will always be the same even if the router 318 00:14:29.919 --> 00:14:32.279 restarts or the network configuration changes. 319 00:14:32.360 --> 00:14:34.039 Okay, that makes a lot of sense. It's like giving 320 00:14:34.039 --> 00:14:36.480 that device a permanent address instead of letting it bounce 321 00:14:36.519 --> 00:14:40.240 around the temporary one. But the book also mentioned something 322 00:14:40.279 --> 00:14:43.799 about MC addresses being involved in DHCP reservation. 323 00:14:43.960 --> 00:14:47.279 What are those ah MC addresses right? Another kind of 324 00:14:47.279 --> 00:14:50.720 crucial piece of a networking puzzle. So every network adapter 325 00:14:50.840 --> 00:14:54.679 has a unique MC address. MC stands for Media Access 326 00:14:54.679 --> 00:14:58.399 Control Address, and it's basically like a hardware fingerprint that 327 00:14:58.559 --> 00:15:00.639 identifies the device at the physical level. 328 00:15:00.720 --> 00:15:01.039 Okay. 329 00:15:01.200 --> 00:15:04.840 So, unlike IP addresses, which can change, MC addresses are 330 00:15:04.879 --> 00:15:06.240 permanently assigned to a device. 331 00:15:06.440 --> 00:15:09.200 Okay. So the IP address is like your home address, 332 00:15:09.279 --> 00:15:12.600 which could change if you move, but your RIMS address 333 00:15:12.720 --> 00:15:14.960 is like your Social Security number, which stays with you. 334 00:15:15.279 --> 00:15:16.559 I like that. That's a good analogy. 335 00:15:16.639 --> 00:15:20.600 Yeah, for life. Yeah, okay, So how our MC address 336 00:15:20.679 --> 00:15:23.440 is used in this DHCP reservation thing? 337 00:15:24.000 --> 00:15:26.960 Okay, so when you set up a DHCP reservation, you 338 00:15:27.000 --> 00:15:31.279 typically specify both the device's M ANDC address and the 339 00:15:31.320 --> 00:15:33.600 IP address you want to assign to it, and this 340 00:15:33.639 --> 00:15:37.120 tells the DCP sor hey always assign this specific IP 341 00:15:37.240 --> 00:15:40.559 address to this device whenever connects to the network based 342 00:15:40.559 --> 00:15:42.200 on its unique MC address. 343 00:15:42.279 --> 00:15:45.159 Okay, So it's like the DHCP server uses that MC 344 00:15:45.200 --> 00:15:48.200 address to verify the device's identity before giving it the 345 00:15:48.240 --> 00:15:49.320 reserved IP address. 346 00:15:49.440 --> 00:15:51.799 Exactly. Yeah, it ensures that the right device gets the 347 00:15:51.840 --> 00:15:53.240 right IP address every time. 348 00:15:53.320 --> 00:15:56.120 That's pretty clever. But the book also mentioned something about 349 00:15:56.320 --> 00:15:59.559 MBC address cloning or spoofing. Is that something we need 350 00:15:59.600 --> 00:16:00.000 to be worried? 351 00:16:00.279 --> 00:16:03.000 It's something to be aware of, especially in terms of security. 352 00:16:03.519 --> 00:16:06.120 So MC address spoofing is a technique that allows a 353 00:16:06.159 --> 00:16:09.159 device to pretend to have a different MC address than 354 00:16:09.200 --> 00:16:09.879 its actual one. 355 00:16:10.000 --> 00:16:11.720 Okay, why would some one want to do that? 356 00:16:11.960 --> 00:16:14.200 There are a few reasons. So in some cases it 357 00:16:14.279 --> 00:16:17.679 might be used to bypass what they call Mac address filtering, 358 00:16:18.240 --> 00:16:21.159 which is a security measure that allows you to restrict 359 00:16:21.200 --> 00:16:24.240 access to your network based on Mac addresses. 360 00:16:24.360 --> 00:16:27.399 Okay, so if someone knows the MAC address of a 361 00:16:27.399 --> 00:16:29.960 device that's allowed on the network, they could spoof their 362 00:16:30.039 --> 00:16:31.759 MAC address to gain access. 363 00:16:31.960 --> 00:16:35.879 That's one possibility, okay, but you know, Mac address spoofing 364 00:16:35.919 --> 00:16:39.279 can also be used for more malicious purposes, like impersonating 365 00:16:39.320 --> 00:16:42.200 another device on the network to intercept its traffic. 366 00:16:42.480 --> 00:16:45.600 So it's a potential security vulnerability we should be aware of. 367 00:16:46.159 --> 00:16:49.159 But if we're using strong encryption on our Wi Fi network. 368 00:16:49.320 --> 00:16:52.000 Shouldn't that prevent unauthorized access anyway. 369 00:16:52.320 --> 00:16:55.000 Encryption is definitely an important layer of security, for sure, 370 00:16:55.480 --> 00:16:58.960 but it's not foolproof. You know, a determined attacker could 371 00:16:59.000 --> 00:17:03.039 potentially find ways to bypass encryption or exploit other vulnerabilities. 372 00:17:03.279 --> 00:17:05.680 That's why it's important to have multiple layers of security 373 00:17:05.720 --> 00:17:09.559 in place. You know, strong passwords, firewalls, up to date 374 00:17:09.640 --> 00:17:11.839 security software, all that good stuff. 375 00:17:12.000 --> 00:17:15.200 So Mac address spoofing is a reminder that security is 376 00:17:15.200 --> 00:17:18.519 an ongoing battle. We can't just set it and forget it, it. 377 00:17:18.480 --> 00:17:20.720 Is, right, Yeah. Yeah, it's a constant cat and mouse 378 00:17:20.759 --> 00:17:23.480 game between the security professionals and you know, the people 379 00:17:23.480 --> 00:17:28.319 who are trying to exploit vulnerabilities. But by understanding those 380 00:17:28.359 --> 00:17:33.039 potential risks and taking precautions, you can significantly reduce your 381 00:17:33.079 --> 00:17:34.240 chances of becoming a victim. 382 00:17:34.359 --> 00:17:37.680 Right, Okay, speaking of taking precautions, I think one simple 383 00:17:37.680 --> 00:17:39.319 step that we can take is just making sure that 384 00:17:39.400 --> 00:17:43.559 our devices are configured to connect to the right networks. 385 00:17:43.559 --> 00:17:46.480 It seems like every operating system has its own way 386 00:17:46.480 --> 00:17:48.440 of handling Wi Fi connections. 387 00:17:48.519 --> 00:17:50.119 Yeah, it can be a little bit of a jungle 388 00:17:50.160 --> 00:17:52.960 out there. Lots of different settings and menus to navigate. 389 00:17:53.359 --> 00:17:55.839 But this book does a great job actually of walking 390 00:17:55.880 --> 00:17:59.519 you through the process of connecting to a network on 391 00:17:59.640 --> 00:18:05.000 a variete of different operating systems okay, including mac Os, iOS, Windows, Android, 392 00:18:05.000 --> 00:18:05.759 even Chromos. 393 00:18:05.920 --> 00:18:07.799 That's good to know I've gotten a new device before him, 394 00:18:07.799 --> 00:18:10.440 And like, how do I even connect to Wi Fi? 395 00:18:10.599 --> 00:18:14.240 It's not always obvious, but the book provides very clear 396 00:18:14.799 --> 00:18:19.319 step by step instructions, screenshots, even tips for troubleshooting common 397 00:18:19.359 --> 00:18:22.440 connection problems. It's like having a tech support guru right 398 00:18:22.480 --> 00:18:22.880 there with you. 399 00:18:23.119 --> 00:18:25.359 Okay, So even if you're not a tech expert, you 400 00:18:25.400 --> 00:18:29.400 can confidently connect your devices and get online exactly okay. 401 00:18:29.440 --> 00:18:32.759