Upon receiving an Ethernet frame on one of its ports, what address does a Layer 2 switch use to make its forwarding decision?
Destination IP address
Destination MAC address
Source MAC address
Source IP address
A Layer 2 switch makes its forwarding decision based on the destination MAC address contained within the Ethernet frame's header. The switch looks up this destination MAC address in its MAC address table to find the corresponding output port. The source MAC address is used to build the MAC address table (the learning process), not for forwarding. IP addresses, both source and destination, are used by Layer 3 devices, like routers, for packet forwarding between different networks.
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