Do you think that it is easier, harder, or about the same level of difficulty to hack a two-tiered versus a three-tiered client server system? Find out specific security vulnerabilities in each architecture, and share with the class. (We are not trying to create hackers here. But it is difficult to create a reasonable system and choose appropriate architectures, languages, encryption standards, software, etc., without being cognizant of security threats and inherent weaknesses of the choices.)