What are two reasons a switch experiences frame flooding? (Choose two.)

A defective patch cable can cause an interface to flap (go up/down), leading to frequent MAC address table updates and potentially flushing learned MAC addresses for that port, resulting in unknown unicast flooding.

Spanning Tree Protocol (STP) topology changes trigger a MAC address table flush on affected switches to prevent forwarding loops with the new topology, causing unknown unicast frames to be flooded until new MAC addresses are learned.

An aged MAC table entry by itself causes a single instance of flooding for frames destined to that MAC until it's relearned; it does not cause 'excessive updates' leading to widespread flooding.

Port-security configured globally doesn't directly cause frame flooding; it restricts MAC addresses on a port and triggers violations.

While a forwarding table overflow can lead to unknown unicast flooding, it's typically a symptom of specific attacks or misconfigurations, less common than physical issues or STP changes.