Discuss the relative advantages and disadvantages of implementing cryptographic protocols at the application layer (layer 7), network layer (layer 3), and transport layer (layer 4) of the OSI basic reference model. Justify your answer by referring to the different security related technologies/solutions seen in the course (or others you read about) and the strengths and weaknesses they show because of their position in the protocol stack. We suggest that you answer this question as a group, with each student arguing for a different layer and the other students commenting on his/her answers, using blackboard.