In addition to masking the host ID from the network ID, a subnet mask also can serve to segment a single network into multiple logical networks. For example, assume that your small company obtains Internet access from a local ISP. The ISP uses a class C address space to accommodate a group of small business clients, of which your company is one. The ISP uses a subnet mask of to divide the network into eight subnets with 30 hosts each. Table 15-3 lists the host ranges for each subnet.

Table 15-3: Sample Subnet


Host Range

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