Questions and answers for exam Preparation

MCQs

Total Questions : 885 | Page 26 of 89 pages

Question 251. Which of the following refers to the terms "residual error rate"?

the number of bit errors per twenty four hours of continuous operation on an asynchronous line
The probability that one or more errors will be undetected when an error detection scheme is used
signal to noise ratio divided by the ratio of energy per bit to noise per hertz
the probability that one or more errors will be detected when an error detection mechanism is used
None of these

Discuss Question

Answer: Option B. -> The probability that one or more errors will be undetected when an error detection scheme is used

Question 252. Which of the following summation operations is performed on the bits to check an error-detecting code?

Checksum
Coder-decoder
Codec
Attenuation
Broadband and baseband refer to the different frequencies at which infrared operates then transmitting signals in certain conditions

Discuss Question

Answer: Option A. -> Checksum

Question 253. The research and development department at your office has been experimenting with different technologies to help improve the performance of the network. One group has been examining the use of a broadband network versus a based band network. Select the correct statement about broadband and baseband.

Baseband networks carry a single channel on a single cable, whereas broadband networks carry several channels on a single cable
Broadband networks carry several channels on a single cable, whereas in a baseband network several cables carry one channel
Baseband operates at a standard bit rate, whereas broadband may operate at different rates as needed
Broadband and baseband refer to the different frequencies at which infrared operates then transmitting signals in certain conditions
Baseband refers to local area networks, and broadband refers to wide area networks.

Discuss Question

Answer: Option A. -> Baseband networks carry a single channel on a single cable, whereas broadband networks carry several channels on a single cable

Question 254. An error-detecting code inserted as a field in a block of data to be transmitted is known as

Error detecting code
Checksum
Frame check sequence
flow control
None of these

Discuss Question

Answer: Option C. -> Frame check sequence

Question 255. The cheapest modems can transmit

1,200 bits per second
2,400 bits per second
4,800 bits per second
300 bits per second
None of these

Discuss Question

Answer: Option D. -> 300 bits per second

Question 256. The receive equalizer reduces delay distortions using a

None of these
tapped delay lines
gearshift
descrambler
difference engine

Discuss Question

Answer: Option B. -> tapped delay lines

Question 257. What is the usual number of bits transmitted simultaneously in parallel data transmission used by microcomputers?

4
None of these
9
8
16

Discuss Question

Answer: Option C. -> 9

Question 258. Computers cannot communicate with each other directly over telephone lines because they use digital pulses whereas telephone lines use analog sound frequencies. What is the name of the device which permits digital to analog conversion at the start of a long distance transmission?

Attenuation
Teleprocessor
Interface
Modem
None of these

Discuss Question

Answer: Option D. -> Modem

Question 259. Four routers have to be interconnected in a point-to-point Network. Each pair of root us may connected by a high-speed line, a medium speed line or a low speed line. Find the total number of topologies.

ARP.EXE
81
48
729
12

Discuss Question

Answer: Option D. -> 729

Question 260. A network consists of eight NT servers. You are planning to move servers to different segments of your network, what utility should be used at each server to determine which server generates the most traffic?