In a network, a host sends data to another host, but the switch forwards the frame out of all ports except the one it was received on. What is the most likely reason for this behavior?
The switch's routing table is full.
The switch does not have the source MAC address in its MAC address table.
The switch does not have the destination MAC address in its MAC address table.
When a switch receives a frame with a destination MAC address that is not in its MAC address table, it floods the frame out of all ports except the one it was received on. This is because the switch does not know which port leads to the destination, so it forwards the frame to all ports in an attempt to reach the intended recipient. If the switch did not have the source MAC address, it would simply learn it by associating the source MAC with the incoming port. A full MAC address table may lead to issues, but the switch would typically replace aged-out entries; it would not cause flooding in this scenario.
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Cisco CCNA 200-301
Network Fundamentals
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