How many bytes of overhead are added to a packet traversing a GRE tunnel? 05/22/2020 – by Mod_GuideK 0 How many bytes of overhead are added to a packet traversing a GRE tunnel? A. 20 B. 24 C. 12 D. 16 SHOW ANSWERSCorrect Answer: B Explanation/Reference: Download Printable PDF. VALID exam to help you PASS.