A switch running in cut-through mode reads a frame's header and decides where to forward the data, before it receives the entire packet.

Name: A switch running in cut-through mode reads a frame's header and decides where to forward the data, before it receives the entire packet.
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In cut-through mode, a switch reads the frame's header, specifically the destination MAC address, and starts forwarding the frame to the appropriate port before it has received the entire packet, reducing latency.

A Switch Running in Cut-Through Mode Reads a Frame's Header