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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