1. Briefly describe the seven layers of the OSI protocol hierarchy. 2. List and briefly describe…

1. Briefly describe the seven layers of the OSI protocol hierarchy.

2. List and briefly describe the basic functions of the five components of a data communications circuit. 3. Briefly describe the differences between serial and parallel data transmission.

4. What are the two basic kinds of data communications circuit configurations?

5. List and briefly describe the four transmission modes.