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16. 

How many pairs of stations can simultaneously communicate on Ethernet LAN?
A. 1
B. 2
C. 3
D. multiple
E. None of the above
17. 

The OCR reading unit attached to a POS terminal is called a
A. light pen
B. wand
C. cursor
D. All of the above
E. None of the above
18. 

A protocol is a set of rules governing a time sequence of events that must take place
A. between peers
B. between modems
C. between an interface
D. across an interface
E. None of the above
19. 

The coming together of three technologies i.e. microelectronics, computing and communications has ushered in
A. information explosion
B. information technology
C. business revolution
D. educational upgradation
E. None of the above
20. 

Terminals are used to
A. collect data from the physical system
B. provide information for the manager
C. communicate management decisions to the physical system
D. All of the above
E. None of the above