A Layer 2 switch does not rewrite source and destination MAC addresses when forwarding a normal Ethernet frame within the same VLAN. It learns the source MAC address from the incoming frame, looks up the destination MAC address in its MAC table, and forwards the frame out the appropriate port. The frame ' s Layer 2 addresses remain the original source host MAC and destination host MAC. A router behaves differently: when routing between networks, it removes the old Layer 2 header and builds a new one for the next hop. This question is testing that boundary. Cisco CCNA 200-301 v1.1 Network Access requires candidates to understand switching behavior at Layer 2 versus routing behavior at Layer 3. The switch may flood if the destination is unknown, but it still does not replace addresses with its own. It also does not change the destination to ffff.ffff.ffff unless the original frame is a broadcast. The expected outcome is that source and destination MAC addresses remain the same.