Which configuration change can be made to influence the VLAN revision number?

To influence the VLAN revision number within a VLAN Trunking Protocol (VTP) domain, changing the VTP mode is the correct action. The VTP revision number is a key component of VTP that helps in determining the most recent VLAN information amongst switches in the network. Each time a switch in VTP server mode is configured or changes its VTP mode to server, it can increment the revision number.

When a switch is set to transparent or client mode, it does not modify the VLAN revision number, which means your ability to influence it relies on being in server mode. This change helps the network adapt to new VLAN configurations effectively.

Other options do not impact the VTP revision number directly. For instance, adding a new VLAN may add to the VLAN list but does not affect the revision number unless it is part of a modification that leads to a manual change in the VTP server switch configuration. Modifying switch priority primarily pertains to spanning tree protocol (STP) and does not affect VTP configurations. Turning off DHCP does not relate to VTP operations at all, as DHCP is concerned with IP address allocation and not VLAN management.