What does a BPDU do in a network?

• A. It determines the topology of the network.
• B. It manages security policies for connected devices.
• C. It assigns IP addresses to hosts.
• D. It controls user access privileges.

Answer: (A)

BPDU frames are used by the Spanning Tree Protocol to exchange topology information between switches. By carrying details like bridge IDs and path costs, they let switches elect a root bridge and decide which ports should forward or block to create a loop-free network tree. In short, BPDUs are what enable the network to determine its topology and avoid loops. They aren’t about security policies, IP address assignment, or user access controls.