What is the default behavior of a Layer 2 switch when a frame with an unknown destination MAC address is received?
A.The Layer 2 switch drops the received frame. B.The Layer 2 switch floods packets to all ports except the receiving port in the given VLAN. C.The Layer 2 switch sends a copy of a packet to CPU for destination MAC address learning. D.The Layer 2 switch forwards the packet and adds the destination MAC address to its MAC address table.正确答案B
