Do presentation layers add an attack surface to the enterprise? How about an e-commerce presence?

1. Do presentation layers add an attack surface to the enterprise? How about an e-commerce presence?

2. 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?

Use facts and examples to support your answers. Use APA style for any references.