Question

Better security is obtained if filtering in consumer grade routers are done using


MAC address
Network mask
Network address
Port number

Answer 1

network mask is the right answer

Answer 2

network mask  is called a subnet mask because it is used to identify network address of an IP address by perfoming a bitwise AND operation on the netmask. A Subnet mask is a 32-bit number that masks an IP address, and divides the IP address into network address and host address.