Question: Explain the difference between physical and architectural information system models, as well as why both are necessary. Give an example of four types of distributed

Explain the difference between physical and architectural information system models, as well as why both are necessary.
Give an example of four types of distributed systems and discuss the goals of a distributed system.
What are the differences between two- and three-tiered network architecture?
Why is middleware important to informaticists? What is the function? How does it work?
Compare design models of distributed systems with respect to functionality.
Describe the development process of a distributed system.

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