But since you’re looking at a Class C address, you can just count those last ?ve subnet bits. That is, you look at the 11111 portion of the 11111000 octet. And then, since you know it takes 5 bits, you can just raise 2 to the number of host bits (5) and derive the answer: 25 = 32.
Thus, you have 32 subnetworks available, so, yes, you can accommodate the design requirements!
The most common way you might be required to subnet on the A+ Certification exam is by being given a standard topology and then being asked to subnet the topology using only public addresses. The purpose of this exercise is to prove that you both understand how to subnet and can effectively design a complex infrastructure using Windows Server 2008. Normally, you will be given a diagram like Figure 2.1.
In the network diagram in Figure 2.1, your topology requires six different subnetworks because your overall design contains six different sites. Of course, from a Windows administrator point of view, this means you’re going to have a lot of work on your hands: you have to subnet the network; connect the different subnets with site links; verify your replication strategy, schedule, and connections; and then do a little quality assurance to make sure everything is functioning properly. For now, you will stick to the initial process of sub- netting the network. Let’s assume for the moment that you have been given the Class CCNA Exam address range of 209.81.3.0.
Remember, this address is Class C because the first octet is greater than 192. This also means there is only a single address, but you require six different subnetworks because of the earlier requirements. To support this many networks, you have to do a minor calcula- tion with a portion of your subnet mask, the last octet. Normally, the default subnet mask for a Class C network is as follows:
Or, written in decimal format, it’s simply 255.255.255.0. Now, because you’re operat - ing within the boundaries of a Class C address, you’re concentrating only on the last octet: 00000000. The first objective, as you might imagine, is to make sure you have enough space in your subnet mask to support the amount of networks you need to accomplish your objective. To do this, you simply take the number of networks you need (six in this case) and go up the binary digits of binary notation until you reach a number greater than your original number:
First digit 20= 1 (not enough networks)
Second digit 21= 2 (not enough networks)
Third digit 22= 4 (not enough networks)
Fourth digit 23= 8 (two more networks than required)
MCITP Certification course is different from other courses in a lot of ways. For example, the candidate is just supposed to qualify one network+exam for him to be awarded with the certificate.
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