Which statement about the STP family is true?

• A. STP prevents network loops by blocking redundant paths.
• B. RSTP converges faster than STP.
• C. MSTP maps all VLANs to a single spanning-tree instance.
• D. STP is not used in modern networks.

Answer: (A)

Spanning Tree Protocol creates a loop-free network by turning multiple available paths into a single active tree. It does this by electing a root bridge, choosing the best path from each switch toward the root, and blocking any redundant links. That intentional blocking of extra ports is how the protocol prevents network loops from forming when there are multiple paths between devices. So the statement captures the essential behavior of the STP family. For context, faster convergence is a feature of its newer variants, MSTP organizes VLANs into multiple spanning-tree instances rather than a single one, and STP remains in use in many modern networks alongside these newer developments.