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All right so we're going to move down a layer here and talk about Layer 2.
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So remember ip for ip 6 IP addresses as a whole.
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That is Layer 3.
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We're talking about routing here in layer two.
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We're going to be talking about a MAC address or a physical address.
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Now Mac stands for media access control and that is identified here in our IRF config as this ether
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here.
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So we could think of this as our physical address and a way that we communicate when we are using switches
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which is communicate over this physical address.
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This is kind of how they know what device is.
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What.
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So what we say here is if we have a device say you just built a computer and you're installing your
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network interface card or your Nick you're going to plug it in and you're going to have a mac address
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for that Nick your cell phone.
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That's going to have a mac address anything that's using a network interface is going to have a mac
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address.
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So these MAC addresses are important because they utilize layer two or switching and they are how we
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communicate over switches.
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Now there's something to be noted briefly about MAC addresses.
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Now MAC addresses have identifiers.
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So as you can see here this MAC address has six different pairs of two.
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Right.
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And what we can do is we could take the first three pairs and we can just copy this and we can go out
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and we can try to put it into a MAC address.
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Look up now for this one.
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This is just going to be VM where I'm not sure if it's actually going to come up but I'm going to go
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ahead and paste it and see what happens and you can see that the vendor actually shows up as VM where
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so the first three pairs here are identifiers and we can identify what we're up against.
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If you've ever looked in your house and you've looked at your network and you you're trying to find
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a device and you see the IP address but the IP address isn't really help you identify it you might see
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something along the lines of a MAC address because your your home device say your your router might
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also be what's called a layer to slash Layer 3 device meaning it's doing switching and routing for you
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and it will also know the MAC address of that device.
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So you can take the first three pairs here.
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Put those into the Google machine and see if you can identify what that device is.
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So if I was unsure this didn't have a hostname or Device name and I could just reach out and say OK
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well let me me look these up.
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Maybe it'll give me an inkling.
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It's not going to tell me the exact device but if I know it's running VM where then I can say oh you
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know that's my host machine running or if it's related to like Texas Instruments or something maybe
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I know that device in my house.
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So this is just a quick way to look up devices and know about them.
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The other option or other thing that you need to know here is just that again Mac addresses layer two
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related to switching.
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I'm just trying to repeat this and get this into your head so that's all we need to know from this lesson
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and we're gonna go ahead and I'll catch you over in the next lesson.
4770
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