Subnet Mask for Subnetting in Computer Networks
In classful addressing it was assumed that the whole Internet is divided into many networks and each network contains many hosts. Since all addresses in a network belong to a single block, each address in classful IPv4 addressing contains two parts like netid and hostid. The netid defines the network, and the hostid defines a particular host connected to such network. Router decides which packet is for which network based on network id, So in this youtube video we will see the network mask and subnet mask and we will understands how network can divide in the subnetwork using subnet mask.
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