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After you've decided to implement DHCP, the next step after you've installed DHCP server for your network is you need to define and configure a DHCP scope. In doing so you are creating this pool of IP addresses, this IP address database and maybe some of the options with that database, and we'll take a look at how to do some of these DHCP options later on but for now we want to just create and turn on a scope, so that this DHCP server, this newly created DHCP server can start leasing out IP addresses to DHCP clients. We do that by opening through our programs and administrative tools the DHCP MMC snap-in, which we use to manage dynamic host configuration protocol. I've already got it open. Let's go ahead and take a look at it now. Notice that you will be given some directions by simply selecting the DHCP server in your console, also with this console you can add additional servers. So you can be sitting at one DHCP server and manage other DHCP servers across your enterprise. But notice here, before you can issue, before the server can issue IP addresses, you must create a scope and authorize the DHCP server. We will talk about the authorization part of this in future module. So defined here, but to get going you're given the directions here, when in doubt when using the MMC. right click. Right click, choose new scope, you are launched into the new scope wizard. Couple of steps here, next create a scope name, so we'll just call this one scope1 and it's for subnet1, description that's optional information you must give it a name however. Now the IP address range. Now look at this, you can enter the range of addresses that the scope distributes, 192.168.3.10 is going to be the start IP address, the end IP address 192.168.3.50. Now look down here, a subnet mask is automatically generated and also the subnet mask length is automatically generated. Where are these two numbers coming from? Well, look at the address I typed in here. 192 identified as, that's right it's a class C address. So the default subnet mask for that class C address as I'm sure you recall is 255.255.255, how many bits are in that subnet mask? How many bits to use for the host ID? How many bits? 24. We can adjust this as we want to and maybe some of these numbers will look familiar if we use a subnet mask of 20 bits. Then our subnet mask looks like 255.255.240. Let's leave the default just for the creation of our scope here. Click on next, we can add exclusions which is a determination we make if we want certain IP addresses in this range to not be leased out, so say if we didn't want the 15 address in this range to be leased out, we could add an exclusion, a single exclusion or a range of exclusion, and then finally the lease duration, the default is 8 days, under most circumstances you won't change the default but you can do that from here. It also gives you some instances where you might consider changing the lease duration. Sure lease duration can be useful when you have lots of mobile clients, portable computers, dialup clients, for a stable network if you just start serving desktop computers then maybe a longer lease is what you require or need. DHCP options, we won't configure these now, we'll configure these later, so we'll say no but we can do that through the wizard interface, and then we're done, click on finish and before we can make our scope start leasing out IP addresses in an Active Directory environment we need to authorize the DHCP server. So we're going to do that using one of our next modules here. We also want to activate the scope so this can be done with a click of a mouse in the toolbar, it can be done with a right click as always and choosing activate. This is how you setup a DHCP scope to make it functional in your network.