Which protocol supports sharing the VLAN configuration between two or more switches?

Multicast is a method of sending network traffic from one sender to multiple specific receivers, not a protocol for sharing VLAN configurations.

Spanning Tree Protocol (STP) prevents network loops by blocking redundant paths, it does not share VLAN configurations.

VLAN Trunking Protocol (VTP) is specifically designed to propagate VLAN configuration information (like VLAN IDs and names) from one switch to other switches in the same VTP domain, ensuring consistency and reducing manual configuration effort.

Split-horizon is a distance-vector routing protocol mechanism that prevents routing loops by not advertising a route back out the interface through which it was learned.