Networking – Section 7

36. Videotex is a combination of

A. television
B. communication
C. computer technology
D. All of the above
E. None of the above

Correct Answer: D. All of the above

37. Which of the following frequency ranges is used for AM radio transmission?

A. Very Low Frequency : 3 kHz to 30 kHz
B. Medium Frequency : 300 kHz to 3 MHz
C. High Frequency : 3 MHz to 30 MHz
D. Very High Frequency : 30 MHz to 300 MHz
E. None of the above

Correct Answer: B. Medium Frequency : 300 kHz to 3 MHz

38. Baseband is

A. transmission of signals without modulation
B. a signal all of whose energy is contained within a finite frequency range
C. the simultaneous transmission of data to a number of stations
D. All of the above
E. None of the above

Correct Answer: A. transmission of signals without modulation

39. A 4 KHz noise less channel with one sample ever 125 per sec is used to transmit digital signals. Differential PCM with 4 bit relative signal value is used. Then how many bits per second are actually sent?

A.32 Kbps
B.64 Kbps
C.8 Kbps
D.128 Kbps.

Correct Answer: A.32 Kbps

40. X.21 is

A. a method of determining which device has access to the transmission medium at any time
B. a method access control technique for multiple-access transmission media
C. a very common bit-oriented data link protocol issued by ISO
D. network access standard for connecting stations to a circuit-switched network
E. None of the above

Correct Answer: D. network access standard for connecting stations to a circuit-switched network

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