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

Question: 1 / 655

What is the role of a TCN BPDU?

To maintain the current topology

To signal potential loops

To signal a topology change

The role of a TCN (Topology Change Notification) BPDU (Bridge Protocol Data Unit) is to communicate changes in the network topology. When a switch detects that there has been a change to the network—such as a device being connected or disconnected—it generates a TCN BPDU to inform all other switches in the network of this change. This notification helps to quickly update the network's spanning tree configuration, ensuring that any potential loops are avoided by re-calculating the tree structure.

This process is crucial for maintaining network stability and efficiency, as it allows switches to quickly adapt to changes in the network layout. By signaling a topology change, the TCN BPDU plays a key role in maintaining a loop-free environment within a bridged network.

Get further explanation with Examzify DeepDiveBeta

To configure VLANs

Next Question

Report this question

Download Cisco Certified Network Professional Practice Test PDF Study Guide
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy