Which protocol is used on the VPCs of a Virtual Chassis Fabric? 05/22/2020 – by Mod_GuideK 0 Which protocol is used on the VPCs of a Virtual Chassis Fabric? A. IEEE 802.1BR B. MPLS C. VCCP D. IS-IS SHOW ANSWERSCorrect Answer: C Explanation/Reference: Download Printable PDF. VALID exam to help you PASS.