Cisco Certified Network Professional 2026 – 400 Free Practice Questions to Pass the Exam

When BPDU Filter is enabled on a port, it prevents the sending and receiving of Bridge Protocol Data Units (BPDUs). This feature is particularly useful in scenarios where you want to ensure that a port does not participate in the Spanning Tree Protocol (STP), thereby avoiding potential loops or interference from STP when connecting end devices that are not meant to interact with the network topology.

By filtering out BPDUs, the port effectively treats it as if it is a non-STP port. Consequently, the port will not engage in the STP election process or send BPDUs to inform other devices of its presence. This ensures a streamlined operation for end devices while still preserving the integrity of the overall network’s spanning tree structure.

In situations where endpoints like IP phones or PCs connect directly and should not influence the network's topology, this configuration can be beneficial. The other options involve accepting or manipulating BPDUs, which doesn't align with the function of BPDU Filter.