Which OSI layer does IS-IS operate? 06/25/2019 – by Mod_GuideK 2 In which OSI layer does IS-IS operate? A. Layer 1 B. Layer 2 C. Layer 3 D. Layer 4 SHOW ANSWERSCorrect Answer: C Explanation/Reference:
layer 2 is the correct answer.
IS-IS runs on Layer 2. Check wiki or some books.