What is the default Spanning Tree Protocol on HP A-Series switches? 05/20/2017 – by Mod_GuideK 0 What is the default Spanning Tree Protocol on HP A-Series switches? A. STP B. PVST C. MSTP D. RSTP SHOW ANSWERSCorrect Answer: C Explanation/Reference: Download Printable PDF. VALID exam to help you PASS.