Subtitles of the Movie

Now any time you start talking about the subject of Networking you're going to have to first deal with TCP IP when we're talking about a Windows Network and actually when we're talking about most any network that's connected to the Internet. TCP IP is the Transmission Control Protocol Internet Protocol family of protocols really that we're using to connect a lot of computers together and so let's just start with some simple basics, then in the next couple of videos we'll build on these basics and then get you up to the point to where you understand TCP IP, how it's constructed, how we determine subnets and so forth because you will see questions on the exam about subnets, numbers of subnets, and how to calculate various things about subnets and IP addresses, OK? So, if you're already familiar with TCP IP you may just want to watch these briefly or even skip them. If TCP IP is relatively new to you then you want to watch these and you may have to watch them three or four times to get them to really get in your brain and make sense, OK? Now, with TCP IP let's say that we have, notice here we've got five computers and we want to connect these computers together, we want to network them and we want to share information between all five of these computers. Well, what we normally would do is use something like a hub or a switch and we're going to leave routers out of it for now, but a hub is really kind of just a dumb, not dumb, but not intelligent piece of equipment that allows all the computers to plug into this thing so that if this computer needs to communicate with this one the hub will allow, basically bridge the connection between them. Now normally and I'm not totally accurate with my drawing here, these things would plug into one of these slots right here, OK? And then the hub, or the switch, can figure out who needs to get what. Now, to make all that happen each one of these computers needs a unique address, just like the street and house address that you have wherever you live, OK? And so let's say that this computer has an IP address of 192.168.2.1. This one is 192.168.2.2. Now you probably already see a pattern, right? This one you'll hear it called 2.3, 2.4 and 2.5. So you'll notice that certain parts of this address are identical on every one of these and the part of the address that's unique you'll notice on these are the first three sets of characters, or the first three sets of numbers, OK? And we will talk about why that is a little bit later but we've got a couple of other issues to think about. First of all, if every machine has to have a unique address then that's the first thing we've got to police and make sure that every machine has a unique address because if these two machines have the same address we're going to have problems, OK? Next problem we have along with having unique addresses is everybody needs an address. Where do they get it and can we change it? And so, those are going to be some other issues we have to deal with. Also, what happens if this machine drops off the network and a new one comes on, what happens to this address? Can we reassign it to the new machine? Do we not ever want to use this address again? Whatever. Next thing is what happens if this machine always needs to be there and always needs to have the same address? These are other issues and we'll talk about those later on in this course. So, for right now let's just leave it as TCP IP is the protocol that's used to move data between computers, or to connect computers together and TCP IP is based on a unique TCP IP address for every machine. Now in the next video we're going to jump a little deeper into this and we're going to talk about the IP version 4 addresses, OK? We're going to talk about these addresses right here, how to read these and some of the nuances about those that you'll need to understand to be able to answer questions on the exam.