Final answer:
The network ID is determined by applying a subnet mask to the IP address. Class B networks have a subnet mask of 255.255.0.0 and a default mask of 255.255.0.0. The number of host bits in an unsubnetted Class B network is 16.
Step-by-step explanation:
The network ID can be determined by applying a subnet mask to the IP address. It is the portion of the IP address that identifies the network. For example, if the IP address is 192.168.0.1 and the subnet mask is 255.255.255.0, the network ID would be 192.168.0.0.
Class B networks have a range of IP addresses from 128.0.0.0 to 191.255.255.255 and have a subnet mask of 255.255.0.0. If the IP address mentioned in the question falls within this range, then it can be considered a Class B network.
The default mask for a Class B network is indeed 255.255.0.0.
The number of host bits in an unsubnetted Class B network is 16, which means there are 16 bits available to assign to host addresses within the network.