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Cisco Certified Network Associate (CCNA) · Cisco
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Poorly worded question. What types of traffic will a switch flood out all ports? Broadcast and multicast frames, as well as unicast frames to unknown destinations, are normally flooded to all ports in a basic switch, and all of this traffic will circulate in such a loop. Flooding means that the switch sends the incoming frame to all occupied and active ports (except for the one from which it was received). In essence, flooding is when a switch pretends to be a hub. since there is no option to select a broadcast or multicast it can only be assumes that Cisco is referring to option b as no other option can create a "flooding"
The destination is unknown
Switch flooding is done to fill the CAM table and find out if the destination MAC is available. It is sent to all ports except the source one.