computer networks Practice Questions Answers Test with Solutions & More Shortcuts

Question : 26

How much power (roughly) a light emitting diode can couple into an optical fiber?

a) 100 picowatts

b) 440 microwatts

c) 100 microwatts

d) 10 milliwatts

Question : 27

The sharing of a medium and its path by 2 or more devices is called _.

a) Multiplexing

b) Encoxing

c) Line discipline

d) Modulation

e) None of these

Question : 28

Which of the following communications modes support two-way traffic but in only one direction of a time?

a) simplex

b) half-duplex

c) three-quarters duplex

d) All of the above

e) None of these

Question : 29

Which of the following statement is incorrect?

a) Batch processing is the preferred processing mode for telecommunication operation.

b) Half duplex line is a communication line in which data can move in two directions, but not at the same time.

c) Teleprocessing combines telecommunications and DP techniques in online activities

d) The difference between synchronous and asynchronous trans mission is the clocking derived from the data in synchronous transmission.

Question : 30

What should be the extension to execute files?

a) .EXE

b) All of the above

c) .COM

d) .BAT

e) none of the above