Which VTP modes do not provide a list of VLANs in the configuration?

In VTP (VLAN Trunking Protocol), the mode that does not provide a list of VLANs in the configuration is the Client mode. When a switch operates in Client mode, it cannot create, modify, or delete VLANs; it can only receive VLAN information from a VTP server. Therefore, the Client mode does not store its own VLAN configuration, which means it does not maintain a list of VLANs in the configuration.

On the other hand, the Server mode maintains a list of VLANs and can modify the VLAN configuration in the VTP domain. This dynamic sharing of VLAN information is essential for ensuring configuration consistency across switches. Transparent mode can also pass along VLAN information but does not process or store VLAN configurations itself, effectively acting as a bridge between server and client devices without holding a VLAN list itself. Therefore, the specific combination of Client and Server modes highlights that the Client does not retain its VLAN information, validating why this answer is correct.