What does a Layer 2 switch use to decide where to forward a received frame?
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A. B. C. D. E. F.F
A Layer 2 switch uses the source MAC address to decide where to forward a received frame.
When a Layer 2 switch receives a frame, it examines the source MAC address in the frame's header. The switch then checks its MAC address table to see if it has already learned the MAC address associated with the source port where the frame arrived. If the switch has already learned the MAC address, it associates the MAC address with the incoming port and updates the timestamp for the entry in the MAC address table.
If the switch has not learned the MAC address, it associates the MAC address with the incoming port and updates the timestamp for the entry in the MAC address table. The switch then floods the frame out all other ports except the incoming port, in order to learn the MAC address associated with the destination port.
Once the switch has learned the MAC address associated with the destination port, it forwards subsequent frames destined for that MAC address only to the destination port. This process of learning and forwarding based on MAC addresses is known as MAC address learning and forwarding, and it allows Layer 2 switches to build a forwarding table that associates MAC addresses with specific ports.
Therefore, option A. source MAC address is the correct answer for the question.