Which configuration must be made before the private VLAN is configured?

A network engineer wants to ensure Layer 2 isolation of customer traffic using a private VLAN.

Which configuration must be made before the private VLAN is configured?
A . Disable VTP and manually assign VLANs.
B . Ensure all switches are configured as VTP server mode.
C . Configure VTP Transparent Mode.
D . Enable VTP version 3.

Answer: C

Explanation:

You must configure VTP to transparent mode before you can create a private VLAN. Private VLANs are configured in the context of a single switch and cannot have members on other switches. Private VLANs also carry TLVs that are not known to all types of Cisco switches.

Reference: http://www.ciscopress.com/articles/ article.asp?p=29803&seqNum=6