Computer Science Networking Jobs Questions - Set 14 - ObjectiveBooks
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Computer Science Networking Jobs Questions - Set 14

Practice Test: Question Set - 14


1. A medium access control technique for multiple access transmission media is
    (A) Aloha
    (B) Amplitude
    (C) Angle modulation
    (D) Attenuation

2. Which of the following statements is correct for the use of packet switching?
    (A) The subdivision of information into individually addressed packets in conjunction with alternative routing arrangement enabled the transmission path to be altered in the event of congestion or individual link failure
    (B) The employment of additional intelligence within the network enabled more sophisticated error control and link control procedures to be applied
    (C) By employing wide bandwidth circuits for the trunk networks substantial economies through extensive sharing of capacity could be achieved
    (D) All of the above

3. A 4 KHz noiseless channel with one sample every 125 per sec, is used to transmit digital signals. Find the bit rate (bits per second) that is sent, if CCITT 2.048 Mbps encoding is used.
    (A) 500 Kbps
    (B) 32 Kbps
    (C) 8 Kbps
    (D) 64 Kbps

4. IEEE project 802 divides the data link layer into an upper _______ sublayer and a lower _______ sublayer.
    (A) HDLC, PDU
    (B) PDU, HDLC
    (C) MAC, LLC
    (D) LLC, MAC

5. Internet-like networks within an enterprise.
    (A) Intranets
    (B) Switching alternating
    (C) Inter organizational networks
    (D) Extranets

6. Which of the following communications service provides message preparation and transmission facilities?
    (A) Teletex
    (B) Teletext
    (C) x400
    (D) Fax

7. Which of the following statement is correct?
    (A) Satellite transponders use a higher frequency for reception of radiation from earth stations and lower frequency for transmission to earth stations 
    (B) Satellite transponders contain a device that echos the radiation without change from one point on earth to another
    (C) Satellite transponder contain devices that transform the message sent from one location on earth to a different code for transmission to another location
    (D) Satellite transponders us lower frequency reception of radiation from earth stations and higher frequency for transmission to earth stations

8. Which of the following does not allow multiple users or devices to share one communications line?
    (A) Double-plexer
    (B) Multi-plexer
    (C) Concentrator
    (D) Controller

9. The transport layer protocol is connectionless.
    (A) NVT
    (B) FTP
    (C) TCP
    (D) UDP

10. Modulation in which the two binary values are represented by two different amplitudes of the carrier frequency is known as
    (A) Amplitude-shift keying
    (B) Amplitude
    (C) Amplitude modulation
    (D) Aloha

11. The probability that a single bit will be in error on a typical public telephone line using 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal to
    (A) 0.003
    (B) 0.009
    (C) 0.991
    (D) 0.999

12. A decrease in magnitude of current, voltage, a power of a signal in transmission between points, is known as
    (A) Attenuation
    (B) Amplitude
    (C) Aloha
    (D) Carrier

13. With an IP address starting at 200, you currently have 10 subnets. What subnet mask should you use to maximize the number of available hosts?
    (A) 192
    (B) 224
    (C) 240
    (D) 248

14. Which of the following is not a disadvantage of wireless LAN?
    (A) Slower data transmission
    (B) Higher error rate
    (C) Interference of transmissions from different computers
    (D) All of the above

15. Which of the following statement is correct?
    (A) Satellite transponders contain a receiver and transmitter designed to relay microwave transmissions from one point on earth to another
    (B) Satellite transponders contain a device that echo’s the radiation without change from one point on earth to another
    (C) Satellite transponder contains devices that transform the message sent from one location on earth to a different code for transmission to another location
    (D) Satellite transponders use lower frequency reception of radiation from earth stations and higher frequency for transmission to earth stations

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