The dhcp servers down so were not getting any

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configured to obtain an IP address automatically. The DHCP server's down, so we're not getting any addressing. Let's click on Use the following address. Now, before you do this you got to know what addresses you can assign, and you also have to know what subnet you are on. So, don't put anything in this field until you talk to your network administrator and find out what the appropriate IP address is. And while you're there, tell him to get his dang DHCP server up and running again. For this network I happen to know that we are on the 10.0.0 subnet. So, the network portion of my address must always contain 10.0.0. Then I need to assign a unique host address to this system. Once again, I can't just assign anything, I need to talk to the network administrator and find out what IP address I can assign, because remember, IP addressing has to be unique on the network, meaning that no two hosts on the same network can have the same IP address, at least not without some type of network address translation being implemented. So let's say that I talked to my network administrator, and my network administrator said I could use host ID 15 for this computer. So I go ahead and put that in. Now I need to identify the subnet mask.Now, Windows, when it sees the address that I put in up here assumes that I'm using classful IP addressing. In this case, this is a class A, by default, address, and so Windows says, "Oh, you must want "a class A subnet mask." Sometimes it's right, sometimes it's wrong. In this case it is actually wrong, because this network uses a custom subnet mask. Instead of using the standard class A, it uses a 24 bit class C address. Now, you'll note that each of these octets line up with each other. Any time you see an octet down here with a 255 in it, indicates that the corresponding octet in the IP address is part of the network.And any octet down here that has a 0 in it indicates that that corresponding octet in the IP address is the host address. That's why I said earlier that we're on the 10.0.0 network. That's because my subnet mask is 255.255.255. Therefore only this last octet is used for host addressing. So how did I know that? I talked to my network administrator, and he told me what subnet mask to use. Now, the next parameter we need to identify is the default gateway. I could stop right here, and if I did I would be able to communicate with other hosts as long they're on my same network segment. If they're not I've got a problem. For example, if I tried to access google.com at this point it wouldn't work. Why? Because Google does not exist on my local network. It's out on the Internet. Therefore the network board in this system needs to know where to send packets that are addressed to systems that do not reside on the local network. In other words their network address does not start with 10.0.0. Google's IP address does not start with 10.0.0, it starts with something else. Therefore we got to tell the network board where to send those packets so they can be routed to the appropriate computer on the network.
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