What is the purpose of STP in a switched network, and why is rapid convergence important?

• A. STP prevents layer-2 loops; rapid convergence (RSTP/MSTP) minimizes outage duration after topology changes and link failures.
• B. STP eliminates all routing advertisements.
• C. STP increases bandwidth automatically.
• D. STP only applies to wireless networks.

Answer: (B)

STP prevents Layer 2 loops in a switched network by electing a single active path between switches and placing other redundant paths in a blocked state, which creates a loop-free topology for frames to travel. Rapid convergence matters because when a link changes or fails, the network must recompute which paths are active and re-enable necessary links quickly to restore normal data flow with minimal downtime. Modern versions like RSTP and MSTP accelerate this process, so outages are shorter after topology changes or link failures. The other statements don’t fit: STP is not about routing advertisements (that’s Layer 3), it doesn’t automatically increase bandwidth, and STP applies to wired switched networks (not limited to wireless).