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Okay, let's go over some test questions, some sample test questions on some of the ah network issues, and ah, hopefully these will help you get acclimated to what you might see and to see how to come up with the correct answer. First question. Which tool will allow you to release and renew the TCP IP address? And this is one you'll just have to be familiar with those tools we went through in a different video. First one is Ping. Now what does Ping do? If you remember, when you ping an address it sends a little packet of information, it actually sends four packets, and then those packets get bounced back and we check to see how much time it took and how many of the packets found their way back, or how many were lost, so that's not going to release and renew the IP address. TraceRt, this just simply reports back to us every time ah a piece of traffic that we send out across the Internet crosses through routers, so if we do TraceRt to Microsoft dot com it's going to tell us every time between here and wherever their server is that we jumped through a router, so that's not the answer. NSLookup reports back to us DNS information, what the ah DNS servers are reporting back to me, ah, for whatever I'm looking for, that's not it. So this must be it, right? IP Config. Sure enough, that's it. IP Config forward slash release will release the IP address or take it away from your machine; IP Config forward slash renew will tell the DCP server, Hey, how about it dude, give me another IP address, so ah, again, that's Tennessee technical talk for what's going on in the wire. John's IP address is 212 dot 87 dot 73 dot 124 and the subnet mask is 255 dot 255 dot zero dot zero. What portion of the IP address is his network? And let's think back to this and we'll go over this real quick. Notice his IP address, four numbers separated by periods, his subnet mask, four numbers separated by periods, everywhere we see a 255 identifies the network portion of the IP address and so his network would be 212 dot 87. Correct? So 212 dot 87 dot zero dot zero, that looks like it's probably it. Let's see if we get any better choices. 212 dot zero dot zero dot zero: for this one to be correct the subnet mask would have to be 255 dot zero dot zero dot zero. I hope that makes sense. Choice C: 212 dot 87 dot 73 dot zero. For that one to be correct what would the subnet mask need to be? If you answered 255 dot 255 dot 255 dot zero you'd be correct and then answer D: need more information. No, we have all the information we need. So the correct answer as it turns out is A. 255 255 dot zero dot zero tells us that the first two numbers that we see identify the network. Now, last question. Which of the following network types require termination on the ends of the cable? Okay. A Star network? Well on a Star there really isn't an end of the cable, so to speak, there's always a connection on the end of the cable going somewhere. In a mesh, everybody's connected to everybody else so that's not it. In a bus? Well, if you remember from the video the bus was one that needed a termination and a ring, of course, same thing as the other one, there is a connection on every end, so we'll go with bus, and that's the one. Bus networks need termination on the ends of the cable. Those bus, if you remember to go a little deeper here, the bus networks used the coax type cable, okay. So, anyway, this is the best way to study for an exam. Take some of these practice, ah, test questions and don't just look for the correct answer but make sure that you know why the wrong ones are wrong, and a lot of times you can learn how all these pieces and parts fit together by being able to understand why the wrong answer's wrong as much as understanding why the correct one is correct. So there's just ah three sample questions on the network.