What VTP mode does not learn VLAN configuration but relays VTP traffic?

The mode that does not learn VLAN configuration but relays VTP traffic is the Transparent mode. In this mode, a switch does not participate in VTP (VLAN Trunking Protocol) by storing or managing VLAN information. Instead, it simply forwards VTP advertisements from other switches, allowing it to act as a conduit for VTP packets without altering the VLAN information it receives.

This functionality is critical in networks where certain switches need to maintain their own VLAN configurations while still being able to relay VTP messages from other switches within the same VTP domain. Transparent mode allows for flexibility, particularly in complex network topologies, where not all switches need to share the same VLAN configuration.

In contrast, other modes like Server and Client actively learn and maintain VLAN configurations. The Server mode allows switches to create, modify, and delete VLANs for the entire VTP domain, while Client mode can only learn and use the VLAN information that the server publishes. Nondisabled is not a standard VTP mode and does not exist in the context of VTP configurations. Thus, Transparent mode is the proper choice as it aligns perfectly with the scenario of relaying VTP traffic while not learning new VLAN configurations.