78. What is the primary consider ation when designing an error control system for data communications?

B. The overall function and needs of the network

A. How many errors the system will detect and correct

C. The efficiency of the code that results from the design

82. Synchronous transmission is used because:

A. no start and stop bits means higher efficiency

B. it is cheaper than asynchronous since no UARTS are required

C. it is easier to implement than asynchronous

83. The "lifetime" of a packet in an IP network:

C. depends on number of "hops" between nodes

B. depends on elapsed time since transmission

D. is approximately 200 milliseconds

84. A receiver for frequency-hopping spread-spectrum would be:

C. a direct-conversion receiver

90. The main reason that serial transmission is preferred to parallel transmission is that

B. Serial requires only a single channel

C. Serial requires multiple channels

99. The major difficulty faced by delta modulators is

A. Excessive noise producing errors

C. Insufficient frequency response of the intelligence signal

105. Which error detection method consists of a parity bit for each data unit as well as an entire data unit of parity bits?

B. Two-dimensional parity check

108. Modems are required to connect computer to telephone lines because

A. Telephone company rules required them

B. The telephone network bandwidth is too high

D. The telephone network will pass direct current

109. A forward error-correcting code corrects errors by

C. requiring no part of the signal to be retransmitted

A. requiring partial retransmission of the signal

B. requiring retransmission of the entire signal

D. using parity to correct the errors in all cases

113. A receiver for direct-sequence spread-spectrum would be:

C. a direct-conversion receiver

117. Which of the following techniques will not help to correct for transmission line errors?

C. Requires a straightforward transformation from one code to another

B. Easily implemented in both software and hardware

D. Useful for defining font of printed character

118. In an asynchronous data system

B. Each computer word is preceded by a start bit and followed by a stop bit to frame the word.

A. Both sender and receiver are exactly synchronized to the same clock frequency .

C. The receiver derives its clock signal from the received data stream.

DIGI COMMS 67-134 Quiz

68 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

67. In an ESS the ___ stations are part of a wired LAN.

A. AP

B. Server

C. BSS

D. All of the above

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

68. The purpose of echo request and echo reply is to

A. Report errors

B. Check node-to-node communication

C. Check packet lifetime

D. Find IP addresses

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

69. Referred as a modem that is capable of sending and receiving fax as well as data transmission

A. Bell 212-A

B. ARQ

C. Fax modem

D. Data modem

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

70. The bit error rate is

A. The number of bit errors that occur for a given number of bits transmitted

B. The most common method of referring to the quality of a digital communication system

C. Virtually the same as the error probability

D. All the above

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

71. Bit errors in data transmission are usually cause by

A. Equipment failures

B. Typing mistake

C. Noise

D. Poor S/N ratio at the receiver

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

72. The number of bits per sample in DS- 1 is

A. 1

B. 2

C. 4

D. 8

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

73. A hub:

A. sends incoming packets out to all other terminals connected to it

B. sends incoming packets out to specific ports

C. cannot be used in an Ethernet-type network

D. are more common in token-passing networks

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DIGI COMMS 67-134

67. In an ESS the ___ stations are part of a wired LAN.

68. The purpose of echo request and echo reply is to

69. Referred as a modem that is capable of sending and receiving fax as well as data transmission

70. The bit error rate is

71. Bit errors in data transmission are usually cause by

72. The number of bits per sample in DS- 1 is

73. A hub:

74. Software flow control uses:

75. The layer is the layer closest to the transmission medium.

76. The synchronous payload envelope of an STS- 1 frame contains ____.

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