CompTIA 220-802 Certification Practice Test

Answer: D - The default subnet mask for Class B is 255.255.0.0.

Key Takeaway: A class B subnet uses the first and second octets of an IP address to designate the network ID and the remaining two octets for the designation of the Host ID. The first two bits of the first octet are always set to one zero, 10 to indicate a Class B address. This leaves 14 bits to represent the Network ID giving 16,384 possible network addresses. The remaining 16 bits are available to designate the host ID, providing for 65,534 hosts per network.