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problem1. The information to be transferred in data communications system is the ______.

(a) Message

(b) Protocol

(c) Medium

(d) Transmission

problem2. Which topology needs a multi-point connection?

(a) Star

(b) Mesh

(c) Ring

(d) Bus

problem3. Data flow between two devices can take place in a _______ way.

(a) Full-duplex

(b) Half-duplex

(c) Simplex

(d) All of the above

problem4. As data moves from the lower to the upper OSI layers, headers are _______.

(a) Modified

(b) Rearranged

(c) Added

(d) Removed

problem5. The physical layer is concerned with movement of __ over the physical medium.

(a) Programs

(b) Protocols

(c) Bits

(d) Dialogues

problem6. ________ is a kind of transmission impairment in which the signal loses strength due to the dissimilar propagation speeds of each frequency that makes up the signal.

(a) Crosstalk

(b) Thermal Noise

(c) Distortion

(d) Impulse Noise

problem7. In asynchronous transmission, the gap time between bytes is _______.

(a) Variable

(b) Fixed

(c) A function of data rate

(d) Zero

problem8. _______ encoding has a transition at the middle of each bit.

(a) Manchester

(b) RZ group

(c) Differential Manchester

(d) All of above

problem9. The maximum data rate over a 2 MHz channel with SNR of 20 dB is _____.

(a) 3.33 Mbps

(b) 2.16 Mbps

(c) 6.66 Mbps

(d) 13.32 Mbps

problem10. ASK, PSK, FSK are instances of ________ conversion.

(a) Digital-to-digital

(b) Digital-to-analog

(c) Analog-to-digital

(d) Analog-to-analog

problem11. Quadrature amplitude modulation (QAM) is combination of _________.

(a) ASK and FSK

(b) ASK and PSK

(c) PSK and FSK

(d) None of the above

problem12. Which multiplexing method transmits digital signals?

(a) CDM

(b) FDM

(c) TDM

(d) None of the above

problem13. A parabolic dish antenna is a (n) _______ antenna.

(a) Unidirectional

(b) Omni-directional

(c) Bi-directional

(d) Horn

problem14. In cyclic redundancy checking, the divisor is _______ the CRC.

(a) One bit more

(b) One bit less

(c) The same size as

(d) Two bits less

problem15. The most used method to convert analog data to a digital signal is called _____.

(a) PCM

(b) Sampling

(c) PAM

(d) Shift-keying

Computer Network & Security, Computer Science

  • Category:- Computer Network & Security
  • Reference No.:- M98052

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