Cisco Certified Network Professional 2025 – 400 Free Practice Questions to Pass the Exam

The command that shows the inconsistent ports in the spanning tree is "show spanning-tree inconsistentports." This command specifically provides information regarding ports that are not operating in accordance with the desired state of the Spanning Tree Protocol (STP). In STP, inconsistent ports can lead to loops or issues in network topology since they do not conform to the roles or states expected by the network design.

When you utilize this command, it displays the ports that are identified as inconsistent, helping network engineers quickly diagnose and remedy any potential issues within the network configuration that could affect performance and reliability. This level of detail is crucial for maintaining a healthy network environment.

The other provided options do not focus on identifying inconsistent ports. For example, "display spanning-tree ports" and "list spanning-tree ports" may provide generalized information about ports in the spanning tree but do not specifically target inconsistencies. Meanwhile, "show spanning-tree summary" summarizes the overall spanning tree status without detailing individual ports' condition, particularly in terms of inconsistencies. Thus, the specific capability of the command makes it the correct choice for identifying ports that aren't functioning properly within the parameters set by spanning tree protocols.