subnet questions
 

A host with 221.132.43.105 as its IP address and 255.255.0.0 as its netmask. What is the maximum number of subnets; 16 , 4, 2 or is the network not subnetted?

in classfull architecture this is a Class C ip, class C ip default mask is 24
but here you have allocated 16bits for network another 16bits for hosts.

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