Question: The Spanning Tree Protocol (STP) ensures a loop-free ethernet topology. Why is a protocol required to ensure a loop-free ethernet topology (what mechanism of layer

The Spanning Tree Protocol (STP) ensures a loop-free ethernet topology. Why is a protocol required to ensure a loop-free ethernet topology (what mechanism of layer 2 ethernet messages is not present that might otherwise eliminate the need for STP)? What network design feature might cause a loop in an ethernet network?

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