One of the hottest topics in networking right now, currently, has to do with IP version 6 and somehow on this exam, you're probably going to see reference whether it's referenced in a question, or the question directly relates to IP version 6, you will probably see something about IPv6 on the exam. And in this video I just want to show you the very basic reason that we even need another version of TCP/IP. Keep in mind right now we're working on IP version 4 and when I say we need a new version of TCP/IP, we're really talking about the IP portion, not the entire suite. There will be some changes made, but the simple way to answer the question of why do we need IP version 6, is to answer that question with another question, and that is, do you have a smart phone, and iPhone, a Blackberry, any other kind of electronic device that has an IP address? And those things are becoming more and more commonplace now. Well that's the reason we need IP version 6 because, at the present time, we can see it already, and that is the complete exhaustion of all the available unique IP version 4 addresses. Now this, there was this black cloud, hanging over IT back in the 90's as the Internet heated up, and as web commerce heated up, and the whole dot com thing exploded. Then around, as it got closer to 2000, everybody was panicked that we were going to run out of IP version 4 addresses. And then we learned how to use technologies like Network Address Translation, and some other router tricks, and so forth, and this alleviated the problem for awhile, but it's still out there. So let's take a look at the real reason we need IPv version 6. First of all, the IP version 4 address space, or IP as we're using it now, looks like this. It has, it's a 32-bit address space. Now when this was first created, you know, everybody was looking at it, thinking, now there's 4,294,967,296 addresses available, so nobody could really envision back in the 60's, 70's, early 80's, needing unique addresses for over four billion computers OK? Because if you'll think about it, the population of the world in 2006 was just over six billion, so IP version 4 seemed to offer a lot of space, like everything else in computers, we thought way too short sighted. Now the IP version 6 address space, instead of being a 32-bit address space, is 128 bit address space. Now if you remember if you've already watched the videos about IP subnetting and so forth, we talked about binary, and how in binary, this first position is equal to one, then two, four, eight, sixteen, thirty two, and they just keep doubling it, as you go. So going from a 32-bit to 128 bit, it's not four times the addresses, keep in mind, once we get to here, we're at the four billion, and then that doubles, and then that doubles, and that doubles, and that doubles, and that doubles, it's not exactly that doubled, but you know what I'm saying. Every time we move to the left in our binary position again, we double the value before it. So here's what this comes out to in English. There are that many available addresses in the IP version 6 address space. Now let me just give you an example. This is hundreds, this is thousands, this is millions, this is billions. So right here, this 1,768,000,000, that's about a fourth of what's available right now, with our four billion here, and so this is 431 billion right here, this is 607 trillion, and I don't even know what a gazillion or a bazillion, you know, or whatever goes on from here OK? That is how many addresses. Now there's all kind of cool things out there on the Internet about how many addresses are out there, there's an IP address for almost every grain of sand on the planet, for all of the visible stars in the sky, that we can see from Earth, there's just all kinds of ways to explain this, but here's the bottom line. With the acceptance and the implementation of Internet technologies and IP addresses on everything from microwaves to automobiles, to our phones, to just all kind of appliances and tools that we use, we will need a lot more addresses than what we have. Do we need this many? I don't know. Based on everything else that's ever happened with computers, we will consume this many addresses OK? So that is why we need IP version 6 first of all. It is, we have, more addresses, we have larger space, for new devices, and new technologies, and then of course, it gives us the chance to go back and re-design IP from the standpoint of how we're using it now. And I'll talk about some basics on IP version 6 in a different video, but I wanted to show you this. This is the main overriding reason why we need to go to IP version 6.
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