11. Who originally designed TCP/IP?

A. The Department of Defense
B. Novell
C. IBM
D. Xerox

12. The systematic access of small computers in a distributed data processing system is referred to as:

A. dialed service
B. multiplexing
C. polling
D. conversational mode
E. None of the above

13. The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as:

A. modulation
B. demodulation
C. synchronizing
D. synchronizing
E. None of the above

14. An example of digital, rather than analog, communication is

A. DDD
B. DDS
C. WATS
D. DDT
E. None of the above

15. How many OSI layers are covered in the X.25 standard?

A. two
B. three
C. seven
D. six
E. None of the above