Cisco Certified Network Associate (CCNA) Practice Exam 2026 - Free CCNA Practice Questions and Study Guide

To change an OSPF v3 interface to passive mode, the command used is "passive-interface INTERFACE." This command is essential for managing OSPF neighbor relationships. When an interface is set to passive, it will not send or receive OSPF hello packets, which means it won't form OSPF adjacencies on that interface. This is particularly useful in scenarios such as when connecting to end devices or when you want to prevent OSPF messages from being sent over a particular interface without disabling OSPF entirely on that interface.

The other choices pertain to different functionalities; for example, debugging and displaying interface status does not modify the operational state of an OSPF interface. These commands provide insights into OSPF operations or save configurations rather than adjusting the interface settings in OSPF. Knowing how and when to use the passive-interface command is crucial for maintaining a clean and efficient OSPF routing environment.