CIDR to Dotted Decimal Conversions

NEW Cisco CCNA IPv4 Course! Introduction to Conversions and basic configurations
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Alrighty, welcome back. Time to convert time to convert some cider to ddn. Whoo. You name new acronym. All right. Here's an example.

We seen these ciders, right? classes inter domain routing. For those of you that are telling me that he lost man, he talks too many acronyms, but we don't know what they mean. Google. Alright, so they're 24 I mean 24 bits on site a 3030 bits on or 3232 bits on. We've seen these before, but we're gonna turn these into their actual dotted decimal addressing Ah, remember now that isn't addressing as dotted decimal numbering.

I don't know why. Okay. 2525250. All right, that's the first one to a vital, vital vital we do. That's the second one. Two vital, vital 32 that's the last one.

And we do use this when we use host addresses, right? That's what they're called. Alright, so definitely All we're gonna have to do is very simple, very simple to do this little table you're gonna learn, you're gonna see now when we go into our lab, right? Yes, we're going to see our little table that we need to know and I'm gonna reiterate inside there. Okay, and we're gonna cover some ciders. see you inside.

Welcome everybody in our little converting lab. Now it is conversion lab. Basically, they're going to straight out tell you, hey, you need to convert this cider to this dotted decimal or vice versa. They're not going to do that. They used to do that. But you don't have to do that.

Now. I but if they do give you a cider and then you need to input that information into a router or a PC. You have to put in dotted decimal numbering or dotted decimal notation as we used to call it. All right. So this table down here that you're seeing is extremely important. You need to understand if one bit is on this is the decimal body.

If two bits are on, that's it this little dot here So for three bits and 24 I'm sure some of you already know this, but if you don't, here it is. commit this table to memory ladies and gentlemen committed to memory is gonna help you quite a bit. So we'll see how we will use that table. So we're going to convert that cider 12 to decimal numbering. Okay, so how many bits we do we have on on our first octet here, what do we got? We need 12.

So in our eight are fully on the first octet, in the second octet, we got four there on, so that's four octets, right there on four octets that are off, okay, and then the last they're completely gone. So that makes up your 12 bits right there. Which means what does eight bits on me 255 What do four bits on me 240 dot 0000. That's what that equates to. So I look at To see how many bits are on, and then I know to be divided to 40 000. Next one.

How many bits are on in the first octet? Eight emitted bits on the second octet? Eight that makes 16. So two or zero. So we know already that eight and eight right are completely on so we got 255-255-0024 will be the same thing. Eight, not eight, nine, the first three octets.

Ron, the last one is off. Right to 55 all the way. Oh 255255255 whoops. 255 dot zero. Now what about a 28? By 28 Even though 12 was kind of in the middle 28 pretty similar, right?

But the first, the big guys the first octet all a bits are on the second octet, all h1 and 16 and the third octet, all the bits are on. That's 24 Boni 28. So I mean that for more bits are on. So what do we do? We know already that eight means 250 525-525-5255 dot what will four? What's four, four in our table is 240.

So therefore 240. Okay, and then the last one, which is a very common one that we use is fuzzy, you know, we're going in a Wham point to point things like that. We're gonna say okay, 32 we got a bits on a, it's on a it's on. It's 24. Many more bits for 36. So, we have six minutes on.

So now we know what the A means, which is 25 what Put that in our little scenario here. Okay, so we're gonna go to 55255 oops, five. Okay, that's are we? Yeah, first of all, okay, and then we have six. What? Six bits?

Six bits, which I miss only 1234. How about that? I miss five. Ain't that something? Five? That's 248 and this would be 250 to use a mock.

Okay. Oops. Okay, so yeah, six bits on. Yeah. 252 that's what you do. When you're converting from sider notation to about a decimal number, and you're going to reverse it as well, okay, so you know, because what's the importance of this one, they give you a cider, you know that you should know what the decimal is.

So you can input it into the router or the switch or the PC to do you need to be able to quickly you know, say look at it, okay, four bits wrong, so you know where to draw that line. So you know how to subnet, this table is going to be also very handy for subnets. Okay, so just be aware of that. But that's all there is to that. reversing it is just saying, Okay, how many bits we need to turn on. Another example is to make a short example.

Oh, eight and four, right? I got eight on here. I got four on here. That's 12. So we got 12 bits that are on so we will know what the center is. That's how it is.

Okay. That's how they come up with the numbers. And in whatever, whatever classification they may have. Always keep this in mind. Always keep this in mind that in some editing, when we get into it is always making little networks. Okay?

With summarization, why do summarization, sticking all those little networks put them together as one and transforming from point A to point B. Okay? To help your router, alright and things, not overwhelming look at a huge routing table summarization. Okay, and we'll have a nice laugh for that. So you can actually see it does have to look for each and every route that comes in. So it looks for specific things.

Okay. So that is converting a cider into a dotted decimal numbering

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