Which VTP mode allows a switch to create and manage VLANs?

The mode that allows a switch to create and manage VLANs is the server mode. In VLAN Trunking Protocol (VTP), a switch set to server mode can create, delete, and modify VLANs and then advertise these changes to other switches in the VTP domain. This capability is critical because it ensures that all switches within the same VTP domain can remain synchronized with the latest VLAN configuration.

Switches operating in server mode help maintain a consistent VLAN database across the network, which is key for efficient network management and avoiding configuration inconsistencies. This mode is typically used in core or distribution layer switches within a hierarchical network design where centralized VLAN management is beneficial.

In contrast, the client mode allows switches to receive VLAN updates from VTP servers but does not allow them to create or modify VLANs themselves. The transparent mode does not participate in VTP updates; switches in this mode can create and manage VLANs locally, but they do not share this information with other switches in the VTP domain. Lastly, "None" does not pertain to a specific VTP mode related to VLAN management.