Which VTP mode would prevent a switch from affecting VLAN configurations on other switches?

The VTP Transparent mode is designed specifically to prevent a switch from influencing VLAN configurations on other switches within the network. When a switch is configured in Transparent mode, it does not participate in VTP advertisement exchanges. This means it will not send out any VTP messages regarding the VLAN database, nor will it learn VLAN information from other switches.

As a result, the VLAN configurations on a switch in Transparent mode remain local to that switch only, and it will not propagate any changes to other switches in the VTP domain. This is useful in scenarios where network administrators want to isolate specific VLAN configurations and prevent any accidental changes that could affect the overall network configuration.

In contrast, other VTP modes like Client and Server allow switches to either receive (Client) or send and receive (Server) VTP updates, directly influencing VLAN configurations across the network. VTP Pruning, while related to efficient bandwidth management by reducing unnecessary VLAN traffic, does not inherently prevent a switch from affecting VLAN configurations.