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In this video we're going to talk about hexadecimal.
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Firstly why do we care.
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Well we care about hexadecimal because it's used in networking all over the place as an example.
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When you look at the MAC address of a device it's written in hexadecimal.
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I'll show you an example in a moment when I show you the MAC address of that Windows computer.
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So MAC addresses of Britain in hexadecimal what's really becoming important these days is IP version
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6 IP version 6 addresses or.
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Also Britain in hexadecimal.
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So you'll see an IP address such as f e 8 0.
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Colon colon 1.
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You need to be able to interpret IP version 6 addresses.
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You need to know how to do conversions from one numbering system to another.
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As an example you need to know how to convert hexadecimal to binary binary to hexadecimal XY decimal
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to decimal decimal to hexadecimal and all those different combinations.
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So if I gave you a decimal number of 1 2 8 you need to know how to convert that into binary.
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You need to know how to convert that into hexadecimal.
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These are the foundations you need to know these foundations before you really get into networking so
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build a good foundation.
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Learn your numbering system to learn binary.
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Learn hexadecimal and it'll make your life a lot easier.
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OK.
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So let me show you an example of where hexadecimal is used.
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This is a Windows 10 computer.
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It's actually that laptop over there which I'm controlling from my Mac.
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I'm using windows here because a lot of people have Windows computers.
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This is Windows 10 once again I'm the type IP config when I type that.
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You'll notice that command shows us the IP version for address of this computer.
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But it also shows an IP version 6 address.
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This is a hexadecimal value.
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Notice Effi 80.
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That's known as a link local address in IP version 6.
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We'll talk about that later.
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But for the moment notice f e 8 0 hexadecimal values.
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But let me show you a MAC address so I pick config slash all I'll scroll up.
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There's the command.
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We can see that this is the name of my windows computer.
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Notice here physical address.
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This is for a virtual box interface written in hexadecimal.
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Notice the values 0 a 0 0 2 7 0 0 0 0 1 8.
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Those are hexadecimal values once again.
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Let's have a look at the wireless card.
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So here we've got a wireless network adapter.
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This is the physical address or MAC address.
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Here is another one physical address or MAC address.
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Once again these are hexadecimal values.
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You once again need to know how to work with hexadecimal.
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So use the come on IP conflict slash all on your windows computer to see the MAC address of your Windows
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computer.
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Now we can look at the MAC address on my macbook as an example.
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So forgive the pun of looking at the Mac on a Mac.
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Going to the wireless connections open network preferences.
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Here's my Wi-Fi interface.
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I'll go to advanced go to hardware and you can see here is the MAC address of my wireless interface
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card.
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I've hidden that because a MAC address is unique to a device I can see that once again by going to control
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panel in windows go to network an Internet network and sharing center change Adapter Settings and I
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can look at the MAC address of any network interface code on my computer.
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So here's my Wi-Fi network interface card or Nic go to details and here's the MAC address.
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Now I actually change to the MAC address of this network interface card.
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Notice it's a number 0 5 5 4 4 3 3 2 2 1 1.
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I'm manually configured that if you want to know how to do that you can watch this video which I've
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put on YouTube but you don't have to do that but you need to know how to read MAC addresses and what
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they mean.
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