Network Mask
A network mask or a default mask in classful addressing is a 32-bit number with netid bits set to 1s and hostid bits set to 0s.
Network mask helps the router in the internet to extract the network address from the destination address of a packet.
A router uses the AND operation to extract the network address from the destination address of a packet, i.e., When the destination address bits is ANDed with the default mask bits, results the network address bits.
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