Then click "Add Filter Then just click OK. In the preceding topics I introduced the concepts of IP address classes and showed how the classes related to ranges of IP addresses. Of the five classes, D and E are dedicated to special purposes, so I will leave those alone for now. Classes A, B and C are the ones actually assigned for normal unicast addressing purposes on IP internetworks, and therefore the primary focus of our continued attention.
As we've seen, they differ in the number of bits and octets used for the network ID compared to the host ID. The number of different networks possible in each class is a function of the number of bits assigned to the network ID, and likewise, the number of hosts possible in each network depends on the number of bits provided for the host ID.
We must also take into account the fact that one, two or three of the bits in the IP address is used to indicate the class itself, so it is effectively "excluded" from use in determining the number of networks though again, it is still part of the network ID.
Based on this information, we can calculate the number of networks in each class, and for each class, the number of host IDs per network. Table 45 shows the calculations. Let's walk through one line of this table so we can see how it works.
I'll stick with class B since it's "in the middle". The basic division is into 16 bits for network ID and 16 bits for host ID. This gives us a total of 2 14 or 16, class B network IDs. For each of these, we have 2 16 host IDs, less two , for a total of 65, Why less two? These are addresses with "special meanings" as described in the topic that follows. You will also notice that 2 has been subtracted from the number of network IDs for class A. This is because two of the class A network IDs 0 and are reserved.
There are actually several other address ranges that are set aside in all three of the classes that I haven't shown here. They are listed in the topic on reserved, private and loopback addresses. Want this question answered? Study guides. Computer Networking 20 cards. What are advantages of Database Approach. What is a network that covers a large geographical area such as a city country or world. What is the worlds largest wan.
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