Introduction to Section

NEW Cisco CCNA IPv4 Course! Introduction to the course
13 minutes
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Welcome everybody, to the ipv4 class, or course, I should say, Now, we're gonna cover a lot of topics. Okay, a lot of topics, but they're gonna be sweet, simple to understand. It's straight to the point. But things that you need to know, ipv4 is still prevalent in the networking place. Just because ipv6 is here that they're in, say, Hey, get rid of ipv4, we're gonna put ipv6 or Hey, let's run dual stack. That doesn't happen.

I have taught companies that have tried to do dual stack together with ipv6. It still didn't work with certain Application Security applications. Okay, so we just can't get rid of ipv4 and it's still part of your certification. Believe it when I was a plus network Plus, there was obviously but Plus has a two network plus and any Cisco certification, you're going to need the information that's in there. So what are we going to cover? Common hardware user network switches hubs, which we're not using anymore.

Switches, bridges routers, okay. I'm going to show you all these all these types of equipment, obviously, in the simulator. Alright. But I'll let you know hey, one cuz you made multiple broadcast domains, multiple collision domains, you know, where they fit in the OSI model and things like that. You're going to learn how to connect these things together. I'll just show you fairly quickly, because there's not that type, of course.

But I need you to know this because it's very important, because we're going to learn how to plan our network. That's one of the things that's in here, okay, planning and infrastructure. So you need to understand the hardware. All right, and what they do and how many collisions are created and stuff like that. I want to tell you what is in ipv4 by now all you should know what an ipv4 address is. If you don't, well, you need to learn it with me.

And again, you have my book on Amazon, okay, my book on Amazon, the only IP book you'll ever need that will help you along the way it will bolt Well, this is both ipv4 and ipv6, but you're going to just look at the ipv4 section and you'll be fine. You're gonna say like, oh, was it that easy? Alright, so we're gonna learn everything about an ipv4 address, the special types of address idea people write the loopback, things like that reserved addresses that we do not use. And I'll show you how we use one of those reserved addresses when we get into or it's probably the next slide. Because we will do a basic router configuration. We'll know the classes of IP addresses.

When we get there though, that's where we'll be you know, there's a Class A Class B closely because the Class II II will last there's no classes anymore. No, there isn't an ipv6 but an ipv4 guess what classes still exist, and how you look at it with whatever class it is because of the first octet without all will be explained. So you need to know All this all right, the subnet mask, I should have put like, I should have put it in red with exclamation marks, because that is the key to answering any question for ipv4. And when we get there, you'll see why. All right, slider to dotted decimal numbering, there's a new abbreviation All right, for the new CCNA AI conversion, you need to know how to go from slider to dotted decimal, okay? You need to know back and forth back and forth because they may give you a cider, they may give you a decimal, you need to know where to draw that magical line.

So very important to be able to convert your table but the decimal table which you need to commit to memory, it should be like your alphabet and then planning infrastructure. Man that is key. That is so important for you to plan your infrastructure. Just don't walk up into a company and say, all right, just throw this here put that there on the cable here. No, no, no, no, no. Walk around.

Take a look. Whatever's there. Take Your time may take you 1234 days to assess how big you know, depends on the size of the company. Unless I take a week in a little for office dentist playing around a little for little rooms? No, okay, it's not gonna take a week to do that. But then you may go into a government building, and you know, you're going to run the network, okay?

So I need to know, whatever, how's everything running, so you need to do your analysis, you need to do a whole bunch of things, okay? So you need to plan your infrastructure. That's why you need to know your hardware, what cables, you're going to need all these different things, very important and your IP addressing scheme, okay, IP addressing scheme. And then it is gonna be very simple. I sign the IP addresses to end devices. They're not just PCs, okay, or servers, or laptops or anything like that.

There's also phones, printers, things of that nature plotters, for you, architects, all these different end devices that exist out there that you're going to have to assign an IP address to you can do statically you can Through DHCP, you can configure routers Am I going to configure my router as a DHCP? Am I going to configure my switch as a DHCP? Okay, so all these things in order to have an actual DHCP server with reserved addresses, so it all depends on what you're going to do. Alright, so again, that comes back to planning. Alright, but assigning an IP address, you gotta be careful, make sure because nine out of 10 times, it's always an IP address problem, because you put the wrong IP address, or you put the wrong subnet mask, or you put the wrong gateway address or the wrong DNS server address. And you can resolve names, I don't know, why not, because you got the wrong DNS address or an old DNS address.

Okay, so be weary of that. We'll talk about that basic raw configuration. I just, I needed to show you this, I just, it's not a routing class, but you know what you need to know this. And in my resource, I learned it now because we're gonna do the configurations of the router interface anyway. So there's not a big deal. There's real quick, you're going to have the resources up there for you to download so you can have it.

Okay, but it's just you know, password. banners, how to configure SSH username, local username and passwords along your lines, basic things like that how to turn on DNS. So you can look for a DNS server, very basic stuff, but you need to know and definitely you need to know how to configure an interface. Once you got your IP address warding gonna do it, you're gonna put it in an interface. Well, it's a fast you got Fast Ethernet interfaces, you have gigabit interfaces, you have serial interfaces, and that's where your clock rates go on. Because of the synchronization signal.

You need to pull clock rates. So we have a serial, you see the lab that will do, okay. And that's going to be in there. All right. So you'll get this which is nice. Now you'll know Okay, basic stuff, and you'll see it again later.

Later later in other courses to find private IPS versus public IPs. Private its internal. Public. The word says for outside, public you pay private you don't write the power's out. He said, Hey, let me take a chunk out of class A, B, and C. And that's going to be private, that's going to be internal. They are not routable on the internet.

So they're just for internal purposes. So you can submit in there, you can do whatever you want to do in there using private IP. So we'll learn, ah, the private IP range, anything that's not in that range is public. All right. But again, pretty much I think I already said everything about that. But anyway, the need for somebody you need to subnet period, unless you have an office with just three employees, you'll have for three or four computers are in the same room.

Okay. You don't need to submit. All right. But if you have multiple offices, multiple floors, multiple departments, okay, multiple locations. Yes, you need to submit and the subnets should be per VLAN. Right?

Each subnet should be a VLAN. And how you submit it's completely up to you and we talked about that there. But yes, we have to submit and I'm going to show you how to submit Enough, that book comes in, if you don't understand what I'm telling you, or the diagram that I'm showing you, you can go to the book that I have on Amazon, okay? And it'll show you the same thing. But then you know, you can take your time Take a look okay? And what this means, all right, I'm going to show you how to submit, because I need everyone to submit within 30 seconds, not because of the test, it'll help in the test will give you extra time, right?

To do other more important questions, okay. But if somebody gives you a mask, right, well, the number of hosts or the number of networks, you should be able to go ping, this is it, I mean, is an IP version four address is 32 bits each for artists a bit any doctor, you got 10 fingers you can do in your head. Okay. So many different classes of IP addresses. We're gonna do an A, B and A C. Basically what we'll do in there, we're just gonna say, Hey, you got this IP address, or you need I need these number of hosts, what mass would you use, and we'll do that but you'll see the breakdown on that. Okay?

I put it here even quicker. subheading using the magical line because that's what they call another magical line. They never said that before. until I started saying it. Okay, the magical line. All right, that magical line?

Yes. Once you find that line, it's over. Meaning, you know everything. There's one hour increments, this is the number you need to use to Brock. Calculate my broadcast, which by the way, is a wildcard mask. Okay, how many hosts right to left?

How many networks left to right? What is my subnet mask in decimal? Or how many bits we'll have on cider notation? Okay, and you'll do one less one less, one less the network ad is the previous networks. Broadcast what's in between the range? Boom, just like that.

Okay. You'll see. Now we get into summarization, what it is and how to summarize. Very important, right? We have these backbone routers on the internet, that they're like have 10s of thousands of hundreds of thousands of routes that I look at. I can take it no more.

If it crashes, please send summary addresses, which we will. Okay. That's where the importance of summarization, we're gonna do a nice little lab. Okay, it's coming, you're already prepared. All we need to do is advertise the Samir address and you see what happens. I'll show you the before and after.

And you're like, Oh, this is why we summarize. Okay. Very important. Now we'll get into vlsm variable length subnet masking, what it is different subnet mask per right, ah, segment. And how to calculate it Now, obviously, vlsm We know, we know the reason that vlsm and map all these things came about because they said, whoops ipv4 zoning, we have no more v4 addresses. Okay, so we need to come up with a mechanism before this thing just dies on us and we run out of IP addresses before ipv6 is out.

Alright, so that's what this demo I'll show you. This will teach you what it is and the concepts of it. And then we'll actually do an exercise and calculate some realistic numbers. This is easy, wildcard mask and the concepts. Okay? a walker mask is an opposite of your subnet mask, but it is used.

Alright, because we'll calculate it. And we'll see examples of a wildcard mask, because wildcard mask are used in all SPF ACLs Nat, and er GRP. But again, you're in certification purposes, you'll see wildcard mask in eigrp CCNA. And below, you won't, you won't, and don't ever do that in CCNA, put a wildcard mask in the GRP because you could in the real world you will but they want you to understand a certain concept which is classful routing, and that is summarized this we can put the model summary command okay. But you could use wildcard mask any GRP. So they exist everywhere.

I'm gonna show you two ways of doing it. And you're gonna be like, Are you serious? That's it. That's it. Okay. So once we get there, you're gonna see how simple how quick to man you as you, when you're so many when you draw a magic line, I told you, it's already given you a wildcard mask.

It's already given it to you when you draw a line. All right, and I'm going to show you another method as well, by both methods. We're going to do that. So this course is full of information is ipv4 but you need to know it because everyone has ipv4 in their network. They just didn't get rid of it when ipv6 came out. No, they did not.

Or they're running dual stack and they're, oh my god, this will not work with this application. What's going on? So this course, not only is going to show you how to subnet how to summarize vlsm Walker Massey is going to give you an understanding Basic router configuration and the common hardware that we use in our network and what you should do what you should think of when planning and infrastructure. Hope you enjoyed. I'll see you inside

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