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Frames that exceed the Layer 2 Maximum Transmission Unit (MTU) are silently dropped by the networking device. The MTU is a crucial setting that determines the largest frame size that can be transmitted over a network medium without needing fragmentation. When a frame is larger than the MTU, it cannot be processed by the Layer 2 device because it exceeds the permissible size for that particular segment of the network.

This behavior occurs because Layer 2 devices, such as switches, are designed to ensure efficient and reliable data transmission within the bounds of the defined MTU. By dropping oversized frames, these devices maintain the integrity of the network and avoid fragmentation issues that could arise if frames were modified or split. This results in improved performance and reduced complexity in managing network traffic.

In summary, the device's choice to silently drop oversized frames helps maintain network efficiency by enforcing MTU constraints and preventing potential problems associated with larger-than-allowed frame sizes.