![]() The first octet of Class A IP address varies from 0 to 127. The Class A default Subnet Mask is 255.0.0.0. Class A networks are vast, in which 17 million hosts or computers are connected. In this case, the range of addresses in this network is 10.0.0.0 – 10.255.255.255. If the first part of the IP address is reserved for the network part and the remaining is for the host, it is a Class A IP address. Only IP addresses that begins with 10 will be in the same network. The computer can now determine the size of the network. In the picture above you can see that the network part of the IP address ( 10) has been determined. Let’s say that we have the IP address of 10.0.0.1, with the default subnet mask of 255.0.0.0.įirst, we need to convert the IP address to binary: The binary AND operation is used to determine a network range: The 1s in the subnet mask represent a network part, the 0s a host part.Ĭomputers works only with bits. It is used by computers to determine the network part and the host part of an IP address. ![]() Keep in mind that a subnet mask is not actually required to use one of these defaults because the IP address class can be determined by examining the first three bits of the IP. These default masks are summarized in Table-5. What does this mean? Well, just like an IP address, a subnet mask also consists of 32 bits. The default subnet masks are three subnet masks that correspond to the standard Class A, B, and C address assignments. This is so because the default subnet mask for a class A IP address is 8 bits (or, written in dotted decimal notation, 255.0.0.0). ![]() For example, an IP address from the Class A consists of 8 network bits and 24 host bits. ![]() An IP address is divided into two parts: the network part and the host part. ![]()
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