How does a VTP Server increase its revision number?

A VTP (VLAN Trunking Protocol) Server increases its revision number by both creating new VLANs and modifying existing VLANs. The revision number is a key component of VTP's operation, providing versioning for the VLAN information within the VTP domain. When a server makes changes to the VLAN configuration, it increments the revision number to ensure all clients and other servers within the domain recognize that the VLAN information has been updated.

When a new VLAN is created, it signifies a change in the VLAN database, which necessitates an increase in the revision number. Similarly, when existing VLANs are modified—such as changing their names, statuses, or other parameters—this also results in an increment of the revision number. This mechanism ensures that VTP clients receive the most current VLAN information and maintain consistency across the network.

Consequently, since both the creation and modification of VLANs trigger a revision number increment, the correct answer encompasses both scenarios, illustrating the functionality that VTP provides in managing and propagating VLAN information across switches in a network.