NTC 405 Week 3 DQs

What is the difference between a telephone circuit connection and one used for data transmission? Why have the lines between these transmissions methods blurred over time?
What are different modes of circuit and packet-switched networks?
Although most businesses have looked towards the use of T1 or greater connections in the past, how has the use of DSL, ATM, cable modems and fiber changed how businesses maintain data communication in their companies?
What are the common types of methods for using these networks, such as DSL, ATM, and so on? Which are the most economical for business use and why?