Network Security: What are the pros/cons, strengths, and weaknesses of these preventative/technical controls in network security: 1) protocols, 2) biometrics for authentication, 3) Encryption, 4) Smart cards, 5) menus, 6) Constrained user interfaces, 7) passwords, and 8) limited keypads. Are there any other controls you would suggest for network security and what are their strengths and weaknesses?