Subnet mask (subnet mask) also known as the network mask, mask address, subnet mask, it is used to indicate which bits of an IP address identifies the host on the same subnet and which bits identify the host of bit masks. Subnet mask can not exist alone, it must be used in conjunction with an IP address. Subnet mask is only one role, that is, an IP address is divided into network and host addresses of two parts

Subnet mask.ppt

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