1 00:00:05,370 --> 00:00:07,600 In this video we're going to talk about hexadecimal. 2 00:00:07,710 --> 00:00:09,120 Firstly why do we care. 3 00:00:09,120 --> 00:00:15,380 Well we care about hexadecimal because it's used in networking all over the place, as an example. 4 00:00:15,510 --> 00:00:21,180 When you, look at the MAC address of a device it's written in hexadecimal. 5 00:00:21,180 --> 00:00:26,730 I'll show you an example in a moment when I show you the MAC address of that Windows computer. 6 00:00:27,240 --> 00:00:33,060 So MAC addresses are written in hexadecimal, what's really becoming important these days is IP version 7 00:00:33,060 --> 00:00:35,320 6, IP version 6 addresses are 8 00:00:35,310 --> 00:00:37,410 also written in hexadecimal. 9 00:00:37,410 --> 00:00:40,920 So you'll see an IP address such as FE80 10 00:00:41,070 --> 00:00:42,820 colon colon 1. 11 00:00:43,080 --> 00:00:46,670 You need to be able to interpret IP version 6 addresses. 12 00:00:46,950 --> 00:00:51,090 You need to know how to do conversions from one numbering system to another. 13 00:00:51,210 --> 00:00:57,330 As an example, you need to know how to convert hexadecimal to binary, binary to hexadecimal, hexadecimal 14 00:00:57,330 --> 00:01:01,500 to decimal, decimal to hexadecimal and all those different combinations. 15 00:01:01,530 --> 00:01:08,790 So if I gave you a decimal number of, 1 2 8 you need to know how to convert that into binary. 16 00:01:08,790 --> 00:01:12,370 You need to know how to convert that into hexadecimal. 17 00:01:12,420 --> 00:01:18,600 These are the foundations you, need to know these foundations before you really get into networking so 18 00:01:18,600 --> 00:01:20,570 build a good foundation. 19 00:01:20,970 --> 00:01:23,180 Learn your numbering system, learn binary, 20 00:01:23,280 --> 00:01:26,160 learn hexadecimal and it'll make your life a lot easier. 21 00:01:26,700 --> 00:01:27,030 Okay 22 00:01:27,060 --> 00:01:31,470 So let me show you an example of where hexadecimal is used. 23 00:01:31,470 --> 00:01:33,500 This is a Windows 10 computer. 24 00:01:33,540 --> 00:01:37,870 It's actually that laptop over there which I'm controlling from my Mac. 25 00:01:37,980 --> 00:01:42,030 I'm using windows here because a lot of people have Windows computers. 26 00:01:42,090 --> 00:01:47,820 This is Windows 10 once again, I'm gonna type IP config, when I type that 27 00:01:47,820 --> 00:01:53,470 you'll notice that command shows us the IP version 4 address of this computer. 28 00:01:53,610 --> 00:01:56,490 but it also shows an IP version 6 address. 29 00:01:56,520 --> 00:01:59,690 This is a hexadecimal value, 30 00:01:59,730 --> 00:02:01,270 notice FE80. 31 00:02:01,470 --> 00:02:05,040 That's known as a link local address in IP version 6. 32 00:02:05,040 --> 00:02:06,330 We'll talk about that later. 33 00:02:06,450 --> 00:02:11,860 But for the moment notice FE80 hexadecimal values 34 00:02:11,920 --> 00:02:18,480 but let me show you a MAC address, so IP config, slash all, I'll scroll up. 35 00:02:18,600 --> 00:02:20,070 There's the command. 36 00:02:20,070 --> 00:02:23,570 We can see that this is the name of my windows computer. 37 00:02:23,580 --> 00:02:26,010 Notice here physical address. 38 00:02:26,010 --> 00:02:31,140 This is for a virtual box interface written in hexadecimal. 39 00:02:31,140 --> 00:02:37,420 Notice the values 0 A 0 0 2 7 0 0 0 0 1 8. 40 00:02:37,470 --> 00:02:40,690 Those are hexadecimal values once again. 41 00:02:40,830 --> 00:02:43,650 Let's have a look at the wireless card. 42 00:02:43,650 --> 00:02:46,130 So here we've got a wireless network adapter. 43 00:02:46,170 --> 00:02:49,110 This is the physical address or MAC address. 44 00:02:49,110 --> 00:02:53,190 Here is another one, physical address or MAC address. 45 00:02:53,280 --> 00:02:57,360 Once again these are hexadecimal values. 46 00:02:57,660 --> 00:03:00,140 You once again need to know how to work with hexadecimal. 47 00:03:00,210 --> 00:03:05,820 So use the command IP config, slash all, on your windows computer to see the MAC address of your Windows 48 00:03:05,820 --> 00:03:06,870 computer. 49 00:03:06,870 --> 00:03:10,740 Now, we can look at the MAC address on my macbook as an example. 50 00:03:10,740 --> 00:03:15,030 So forgive the pun of looking at the Mac on a Mac. 51 00:03:15,030 --> 00:03:19,020 Going to the wireless connections open network preferences. 52 00:03:19,030 --> 00:03:21,270 Here's my Wi-Fi interface. 53 00:03:21,300 --> 00:03:28,230 I'll go to advanced, go to hardware, and you can see here is the MAC address of my wireless interface 54 00:03:28,230 --> 00:03:29,440 card. 55 00:03:29,530 --> 00:03:36,710 I've hidden that because a MAC address is unique to a device. I can see that once again by going to control 56 00:03:36,710 --> 00:03:43,460 panel in windows go to network an Internet network and sharing center, change Adapter Settings and I 57 00:03:43,460 --> 00:03:47,540 can look at the MAC address of any network interface code on my computer. 58 00:03:47,540 --> 00:03:54,200 So here's my Wi-Fi network interface card or NIC, go to details and here's the MAC address. 59 00:03:54,860 --> 00:03:59,110 Now, I actually change to the MAC address of this network interface card. 60 00:03:59,120 --> 00:04:03,560 Notice it's a number 0 E 5 5 4 4 3 3 2 2 1 1. 61 00:04:03,560 --> 00:04:08,870 I manually configured that if you want to know how to do that you can watch this video which I've 62 00:04:08,870 --> 00:04:14,330 put on YouTube but you don't have to do that but you need to know how to read MAC addresses and what 63 00:04:14,330 --> 00:04:15,050 they mean.