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

A VTP (VLAN Trunking Protocol) client sends a request to the VTP server on the initial connection or when there is a mode change. This occurs because the VTP client needs to synchronize its VLAN database with the VTP server to ensure it has the latest VLAN information. When a client first connects to the VTP domain, it does not possess any VLAN information and must request updates from the server.

Additionally, if there’s a mode change—such as when a switch transitions from a VTP transparent mode to a VTP client mode—the client again needs to establish connectivity with the server to acquire the current VLAN configuration. This request is crucial for maintaining an accurate and consistent VLAN database throughout the VTP domain.

The other options refer to scenarios where a VTP client does not typically initiate a request. For example, a configuration reset doesn't automatically trigger a client to request updates unless the conditions for a reconnect are met. Similarly, requesting updates after every VLAN deletion or advertisement received is not accurate, as the VTP protocol manages information propagation in a controlled manner primarily through advertisements rather than continuous requests.