What is one method to reset the VTP revision number to 0?

Changing the VTP mode to transparent is the correct method to reset the VTP (VLAN Trunking Protocol) revision number to 0. When a switch is set to transparent mode, it no longer participates in VTP advertisements, which means that it will not propagate VLAN information to other switches. Setting the VTP mode to transparent effectively resets the revision number, as the switch is no longer considered a VTP server or client within the VTP domain.

This approach is essential for network administrators who need to ensure that a switch does not inadvertently affect the VLAN configuration in the network, particularly when making significant changes. By switching to transparent mode, the administrator can safely manage VLANs on that switch without worrying about the revision number introducing inconsistencies within the VTP domain.

The other options do not achieve the same result regarding the VTP revision number. Deleting all VLANs affects only the VLAN configuration on the switch without resetting the revision number. Rebooting the VTP server or reconfiguring the switch may have other impacts or may not involve the VTP revision at all, thus not specifically addressing the request to reset the revision number to 0.