Which of the following protocols operates at the HIGHEST level of the OSI model? seenagape 9 years ago Which of the following protocols operates at the HIGHEST level of the OSI model? A. ICMP B. IPSec C. SCP D. TCP Explanation:SCP (Secure Copy) uses SSH (Secure Shell). SSH runs in the application layer (layer 7) of theOSI model. ← Previous question Next question →