Bit from each host in the subnet bits added to get the corresponding decimal subnet, summarized in Table 1 Table 1: The following example, there is no subnet mask to use and the use of the network subnet mask difference. If two class B IP address 172.16.2.160, its default subnet mask is 255.255.0.0, then complete the following tasks without the use of subnets, ie, using only the default subnet mask, as shown in Figure 2, the computational process Fig. If you use 8-bit subnet bits, then the operation process shown in Figure 3. Note: In Figure 3, using the 8-bit subnet bits, the subnet mask value is changed from the default 255.255.0.0 255.255.255.0, so that the logic "and" after the network number has changed. Figure 2:
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