Consider diagram 7-1 from your textbook. Answer the following questions: diagram is in 215th page in the text book which is attached below.

Do presentation layers add an attack surface to the enterprise? How about an e-commerce presence?
The supply chain will interact with an entire business ecosystem of many other organizations. Interactions will probably include both people and automated flows. Are these third parties to be trusted at the same level as the internal systems, such as content management or data analysis?