What is the total length of the port ID in STP? 04/20/2020 – by Mod_GuideK 0 What is the total length of the port ID in STP? A. 4 bits B. 8 bits C. 2 bits D. 16 bits SHOW ANSWERSCorrect Answer: D Explanation/Reference: Download Printable PDF. VALID exam to help you PASS.