Data Communication (CS601)

1. What is the Bandwidth of a periodic signal if it is decomposed into 4 sine waves with frequencies 300, 600, 900 and 1200?

   1. 100
   2. 900
   3. 300
   4. 600

2. Is there any difference between Data communication and telecommunication are network?

   1. Yes
   2. No

3. The inversion of the level at 1 bit is called as ________.

   1. NRZ-L
   2. NRZ-I
   3. RZ
   4. None of the given.

4. What is the period of a Sine wave having frequency of 10 Hz?

   1. 0.2
   2. 0.1
   3. 0.5
   4. 0.3

5. Terminal, microprocessor, computer, printer or any other device that generates or consumes digital data is known as ___________

   1. DCE
   2. DTE
   3. DCE & DTE
   4. None of the given

6. Data is transmitted using light through a ___________ cable.

   1. twisted pair
   2. fiber-optic
   3. coaxial
   4. microwave

7. ________ category of coaxial cable is used for Cable TV.

   1. RG-58
   2. RG-59
   3. RG-11
   4. RG-47

8. If we need to correct a single error in an 8-bit data unit, we need to consider ________ possible error locations.

   1. 16
   2. 2
   3. 4
   4. 8

9. There are three types of Hubs that exist. Which of the following options correctly describes these three?

   1. Passive, dormant, special
   2. Active , dormant , passive
   3. Passive, Active, Turbo
   4. Passive, Active, Intelligent

10. Digital signals are refered to be ___________.

    1. Continuous
    2. Discrete
    3. All of the given
    4. None of the given

11. The ________ protocol uses both flow and error control.

    1. TCP/IP
    2. HDLC
    3. ICMP
    4. Stop-and-Wait

12. In Block coding scheme, number of code words is always ________ data words.

    1. Less than
    2. Equal to
    3. Greater than
    4. Same as

13. The transmission medium that carries the message is referred to as the ___________.

    1. send and receive device
    2. communication channel
    3. protocol
    4. gateways

14. dB is negative if a signal is ___________.

    1. Attenuated
    2. Distorted
    3. Amplified
    4. Noisy

15. A sine wave is defined by ___________ characteristics.

    1. 2
    2. 3
    3. 4
    4. 5

16. The term _______means that only one bit of a given data unit is changed from 1 to 0 or from 0 to 1.

    1. Packet Error
    2. Burst Error
    3. Single Bit Error
    4. Character Error

17. In OSI model headers are added at layer _________.

    1. 1,2,3 only
    2. 6,5,7 only
    3. 5,4,3 only
    4. 6,5,4,3,2 only

18. ________ contains a repeater.

    1. Active hub
    2. Passive hub

19. In an analog hierarchy to carry voice channels, a group can carry ________ voice channels.

    1. 60
    2. 12
    3. 20
    4. 10

20. ________ works with topologies in which one drvice is designated as a primary station and the other devices are secondary stations.

    1. Reservation
    2. Polling
    3. Token
    4. None of the given

21. ________ encoding is almost obsolete today

    1. Bipolar
    2. Unipolar
    3. Polar
    4. None of the given

22. PSK is susceptible to the noise degradation.

    1. True
    2. False

23. Which level of the TCP/IP reference model routes data/information across a network channel?

    1. Application Layer
    2. Data Link Layer
    3. Transport Layer
    4. Network Layer

24. By using ___________ system, change in the file contents during file transmission can be avoided.

    1. Routing
    2. Flow Control
    3. Error Detection and Correction
    4. Congestion Control

25. In statistical time division multiplexing, number of slots in frame are less than ________.

    1. Output data rate
    2. Input lines
    3. Input frequency
    4. Multiplexed T lines

26. If duration of noise is decreased during a transmission over noisy channel, fixed data rate of the channel will cause ________ number of bits being impacted by the noise.

    1. Constant
    2. More
    3. Less
    4. Zero

27. The logical connection between the peer layers is ________ connection.

    1. Physical
    2. Direct
    3. Indirect
    4. Tangible

28. Guard bands are used in ________ multiplexing technique, to avoid overlapping of frequency bands assigned to each user.

    1. PDM
    2. CSMA
    3. TDM
    4. FDM

29. Which of the following is most affected by noise?

    1. PSK
    2. ASK
    3. FSK
    4. QAM

30. Digitizing an Analog Signal is called ___________.

    1. Analog-to-Digital Conversion
    2. Digital-to-Digital Conversion
    3. Digital-to-Analog Conversion
    4. None of the given

31. There are ________ basic categories of multiplexing.

    1. 2
    2. 3
    3. 7
    4. 5

32. In Synchronous TDM, Time slots are not same in number as input devices.

    1. True
    2. False

33. What is the Bandwidth of a periodic signal if it is decomposed into 4 sine waves with frequencies 200, 400, 600 and 800?

    1. 100
    2. 500
    3. 300
    4. 600

34. Radio wave transmission utilizes ___________ different types of propagation.

    1. Two
    2. Three
    3. Four
    4. Five

35. Switch is a network device which operates on the ________ layer of the TCP/IP protocol suite.

    1. Application
    2. Transport
    3. Presentation
    4. Data link

36. In ___________ a dedicated communication path is established between two stations through the nodes of the network

    1. Circuit switching
    2. Packet switching

37. At the CRC generator, ___________ added to the data unit before the divisional process.

    1. 0s are
    2. 1s are
    3. a polynomial is
    4. a CRC remainder is

38. Which one of the following is a correct-access method?

    1. Polling
    2. Token Passing
    3. Reservation
    4. All of the given

39. ________ category of coaxial cable is used for thin Ethernet.

    1. RG-58
    2. RG-59
    3. RG-1
    4. RG-47

40. Which layer is concerned with the syntax and semantics of info exchange between two systems?

    1. Physical
    2. Application
    3. Session
    4. Presentation

41. Checksum is an error-detection technique that can be applied to a message of ________ length.

    1. Exactly 4
    2. Exactly 8
    3. Exactly 32
    4. Any

42. To control and manage the transfer of data, a protocol called Point to Point Protocol (PPP) is used at the ________ layer.

    1. Physical
    2. Network
    3. Presentation
    4. Data link

43. Which one of the following is a Random-Access protocol?

    1. TDMA
    2. CDMA/CD
    3. ALOHA
    4. CDMA/CA

44. In the encoding where positive to negative transition is one and vice versa is zero.

    1. Manchester
    2. Differential Manchester
    3. All of the given
    4. None of given

45. Transmission Control Protocol is a(n) ________ layer protocol.

    1. Transport
    2. Application
    3. Session
    4. Network

46. ________ is responsible for governing node to node communication.

    1. Application Layer
    2. Session Layer
    3. Data Link layer
    4. Presentation Layer

47. ________ is an Authentication Protocol, which uses two-step process to authenticate user information.

    1. CHAP
    2. LCP
    3. PAP
    4. ICMP

48. Session layer is responsible for _________.

    1. Reassembly of data
    2. Maintaining the connection

49. AM signal requires ___________ the BW of original signal

    1. Twice
    2. Half
    3. Same
    4. Three Times

50. In frequency shift keying, ________ remain(s) constant.

    1. Frequency
    2. Amplitude
    3. Both Amplitude and Phase
    4. Both Phase and Frequency

51. To calculate the data rate for noisy channel ________ formula is used.

    1. Shannon
    2. Nyquist
    3. Propagation
    4. Greedy

52. Encoding digital data into digital signals is called ___________.

    1. Analog-to-Digital Conversion
    2. Digital-to-Digital Conversion
    3. Digital-to-Analog Conversion
    4. None of the given

53. Collisions in CSMA/CA are avoided through ________.

    1. The Interframe Space
    2. The Contention Window
    3. Acknowledgements
    4. All of the given

54. Like 10 Base 5, 10 Base 2 is a ________ topology LAN.

    1. Ring
    2. Mesh
    3. Star
    4. Bus

55. STP is more expensive than UTP and is less susceptible to noise.

    1. True
    2. False

56. In Pure ALOHA, the vulnerable time is ________ the frame transmission time.

    1. Same as
    2. Three times
    3. Two times
    4. Four times

57. RZ stands for ___________.

    1. Return to Z
    2. Retire a Zero
    3. Return ot Zero
    4. None of the given

58. Like Data link layer, ___________ is also responsible for Flow control.

    1. Transport Layer
    2. Session Layer

59. Traditionally MANs have been implemented using one of the 2 technologies, Circuit Switching and Packet Switching

    1. true
    2. false

60. Central Hub in a Tree is an ___________.

    1. Active hub
    2. passive hub

61. ________ transmission technology (based on Ethernet) provides a data rate of 1 billion bits per second.

    1. Fast Ethernet
    2. Standard Ethernet
    3. Gigabit Ethernet
    4. 10BASE-T Ethernet

62. In ________, each station is allocated a time slot during which it can send data.

    1. CDMA
    2. NDMA
    3. TDMA
    4. FDMA

63. S-frames in High-Level Data Link Control (HDLC) are only used to transfer ________ information.

    1. User data
    2. Control
    3. Redundant
    4. Original

64. Asynchronous TDM is efficient only when the size of the time slot is kept relatively ___________.

    1. Large
    2. Small
    3. Medium
    4. Zero

65. Which of the following consist of just one redundant bit per data unit?

    1. Two dimentional Parity check.
    2. CRC
    3. Simple Parity Check
    4. Checksum

66. At the CRC checker, ___________ means that the data unit is damaged.

    1. A string of 0s
    2. A string of 1s
    3. A string of alternating 1s and 0s
    4. A nonzero remainder

67. CHAP is an Authentication Protocol, which uses ________ process to authenticate user information.

    1. Two-way
    2. Three-way
    3. Four-way
    4. Five-way

68. Sampling means measuring ____________ of signal at equal intervals

    1. Amplitudes
    2. Frequencies
    3. Phases
    4. None of the given

69. The Internet is ___________.

    1. software for sending e-mail around the world
    2. a government-owned agency that links computers
    3. a global network of computers networks
    4. a specialised form of local area network

70. Analog signals are refers to be ___________

    1. Continuous
    2. Discrete
    3. Periodic
    4. Aperiodic

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

    1. Checksum
    2. Cyclic Redundancy Check (CRC)
    3. Longitudinal Red Check (LRC)
    4. Vertical Redundancy Check (VRC)

72. What was the main draw back in ALOHA Random-Access method?

    1. Redundancy in Data
    2. Potential Collision
    3. Inconsistent Data rate
    4. All of the given

73. Latency is made of ________ components.

    1. Two
    2. Three
    3. Four
    4. Five

74. What is the frequency of a sine wave if it completes one cycle in 2 seconds?

    1. 0.5
    2. 0.6
    3. 0.3
    4. 0.2

75. ________ of a signal is the collection of all the component frequencies it contains.

    1. Time domain
    2. Frequency domain
    3. Frequency spectrum
    4. None of the given

76. Possession of TOKEN gives the station the right to ________.

    1. Modify the data
    2. Send the data
    3. Delete the data
    4. Receive the data

77. Which of the following is not a characteristic of a sine wave?

    1. Amplitude
    2. Segmentation
    3. Phase
    4. Frequency

78. WDM stands for ________.

    1. Wideband De-Modulation
    2. Worst Data Manipulation
    3. Wavelength Division Multiplexing
    4. None of the given

79. Baud rate is greater than or equal to the bit rate.

    1. True
    2. False

80. In circuit switched networks we have low efficiency but minimal ________.

    1. Delay
    2. Speed
    3. Throughput
    4. Errors

81. Human voice is example of ___________ signal.

    1. Digital
    2. Analog
    3. Discrete
    4. None of the given

82. The inversion of the level represents a 1 bit in ______ encoding

    1. NRZ-I
    2. NRZ-L
    3. RZ
    4. Manchester

83. Mr. Asif while sitting in Lahore is talking with his friend in Dubai through Skype is an example of ________.

    1. Local Area Network
    2. Metropolitan Area Network
    3. Wide Area Network
    4. Home Based Network

84. What is the frequency of a sine wave if it completes one cycle in 5 seconds?

    1. 0.5
    2. 0.6
    3. 0.3
    4. 0.2

85. Which error detection method uses one's complement arithmetic.

    1. Cyclic Redundancy Check (CRC)
    2. Longitudinal Red Check (LRC)
    3. Checksum
    4. Simple Parity Check

86. ________ is sometimes called the bit rate.

    1. signal rate
    2. modulation rate
    3. Data rate
    4. pulse rate

87. Analog refers to something that is continuous in ___________.

    1. Time
    2. Space
    3. Frequency
    4. None of the given

88. In ASK, both ______ and ________ remain constant.

    1. Amplitude, Frequency
    2. Amplitude, phase
    3. Frequency, Phase
    4. Amplitude, Samples

89. Radio is an example of _______ signal conversion.

    1. Analog to analog
    2. Analog to digital
    3. Digital to Digital
    4. Digital to analog

90. The message 1110 sent by a source is received by a destination as 1011. This is ________ type of error.

    1. Burst
    2. Single-Bit
    3. Uni-Bit
    4. Hamming

91. We can have ________ different groups with a 4 bit block.

    1. 4
    2. 8
    3. 16
    4. 32

92. The logical connection between the peer layers is ________ connection.

    1. Physical
    2. Direct
    3. Indirect
    4. Tengible

93. In ________, both peak amplitude and frequency remains constant as the phase changes.

    1. PSK
    2. QAM
    3. Both PSK & QAM
    4. None of the given

94. In ________ each band is reserved for a specific ststion, and it belongs to the station all the time.

    1. FDMA
    2. CDMA
    3. TDMA
    4. CSMA

95. In _________, a signal is directed straight from antenna to antenna.

    1. Line of sight propagation
    2. Ground propagation
    3. Space propagation
    4. Tropospheric propagation

96. In which controlled-access method all data exchanges must be made through primary device even when the ultimate destination is a secondary device?

    1. Polling
    2. Reservation
    3. Token Passing
    4. Port Forwarding

97. ________ is normally used where speed is priority in data transfer.

    1. Serial data transmission
    2. Hybrid data transmission
    3. Parallel data transmission
    4. Both parallel and serial data transmission

98. In CRC there is no error if the remainder at the receiver is _______.

    1. Equal to the remainder at the sender
    2. Zero
    3. Nonzero
    4. The quotient at the sender

99. ________ is/are un-reliable protocol(s).

    1. IP and TCP
    2. UDP
    3. IP and UDP
    4. TCP

100. In line discipline after the data transmission, the sending system finishes with an ________ frame.

     1. EOT
     2. EKT
     3. ENT
     4. ESP

101. If the Hamming distance between sent and received code word is ________, then it shows that received data is corrupted.

     1. ≠ 0
     2. = 0
     3. ≠ 1
     4. = 1

102. At the Application layer, object/information is in the form of ________.

     1. Message
     2. Packet
     3. Segment
     4. Frame

103. Time domain shows changes in ___________.

     1. time w.r.t signal amplitude
     2. signal amplitude w.r.t time
     3. time
     4. All of the given

104. In even parity check code, the value of syndrome is ________ if the number of 1s is even.

     1. 1
     2. 2
     3. 0
     4. 4

105. ________ signal can take infinite levels of intensity over time.

     1. Digital
     2. Discrete
     3. Analog
     4. Logical

106. The __________ generates the data and passes it along with any control information to a __________.

     1. DTE, DCE
     2. DCE, DTE
     3. DTE, DTE
     4. DCE, DCE

107. If users must take turns using the link, then it is called Spatial Sharing.

     1. true
     2. false

108. VCI address is ________ address in virtual circuit approach.

     1. Private
     2. Variable
     3. Local
     4. Global

109. In Pulse Code Modulation (PCM), the sampling is dependent on ________.

     1. Time
     2. Amplitude
     3. Frequency
     4. Signal Rate

110. Which of the following statement is correct?

     1. Digital signals are less prone to Noise
     2. Digital signals are highly prone to Noise
     3. Analog Signals are less prone to Noise
     4. Digital signals are not affected by Noise

111. A broadcast signal is received by the orbiting satellites which rebroadcasts ________.

     1. to the resender
     2. to the sender
     3. to the atmosphere
     4. none of the given

112. Following characteristics fully describe ___________,
     Amplitude
     Period/Frequency
     Phase

     1. Sine Waves
     2. Digital Signals
     3. Aperiodic Signals
     4. None of the given

113. POST stand for ________?

     1. Plain Old Telephone Set
     2. Plain Old Time Sharing
     3. Plain Old Telephone System
     4. Plain Old Telephone Service

114. Congestion Control is a feature of layer(s).

     1. Data Link
     2. Network
     3. Transport
     4. All mentioned

115. ________ is an Authentication Protocol, which is used by the PPP to authenticate passwords.

     1. CHAP
     2. PAP
     3. LCP
     4. ICMP

116. Time domain plot show changes in signal phase with respect to time.

     1. true
     2. false

117. CDMA stands for ________.

     1. Carrier Division Multiple Access
     2. Carrier Data Multiple Access
     3. Code Data Multiple Access
     4. Code Division Multiple Access

118. The level of signal is always positive in NRZ encoding.

     1. true
     2. false

119. There are _________ types of serial transmission.

     1. 3
     2. 4
     3. 2
     4. None of the given

120. In ________, each station sends a frame whenever it has a frame to send.

     1. Slotted ALOHA
     2. Fragmented ALOHA
     3. Pure ALOHA
     4. None of the given

121. In ASK correct formula for calculating the bandwidth ia as ________.

     1. B=(1+d)S
     2. B=(1*d)S
     3. B=(d-1)S
     4. B=(d-5)S

122. The most common type of connector used by coaxial cable is ________.

     1. BNC
     2. RJ-45
     3. RJ-11
     4. RJ-57

123. Analog To Analog Conversion Methods include ___________.

     1. AM, PM and FM
     2. AM, FSK and PM
     3. AM, PM and QAM
     4. None of the given

124. ________ is the process of converting digital data to digital signals.

     1. CSMA/CD
     2. CSMA/CA
     3. Line coding
     4. Segmentation

125. The flag in PPP is a byte that needs to be ________ whenever it appears in the data section of the frame.

     1. Duplicated
     2. Blocked
     3. Cleaned
     4. Escaped

126. ________ is not a function of Data Link Control.

     1. Framing
     2. Modulation
     3. Error Control
     4. Flow Control

127. The extra bits added with the original data for error detection/correction are called ________.

     1. Fault bits
     2. Port numbers
     3. Redundant bits
     4. Process IDs

128. Data Link layer provides services to the ________ layer.

     1. Application
     2. Transport
     3. Network
     4. Session

129. Each computer on the Internet has a unique numeric address called a(n) ___________.

     1. domain address
     2. protocol address
     3. IP address
     4. Web address

130. In analog transmission, the base signal is called the________.

     1. Carrier Signal
     2. Analog signal
     3. Digital signal
     4. Modulated signal

131. ________ are used to exchange session management and control information between connected devices.

     1. I-frames
     2. U-frames
     3. S-frames
     4. N-frames

132. ________ is the rate of change with respect to time.

     1. Voltage
     2. Time
     3. Frequency
     4. Amplitude

133. In TCP/IP protocol suite, the process of adding header at each layer on sending side is known as ________.

     1. Encapulation
     2. De-encapulation
     3. Packetizing
     4. Framing

134. The type of ALOHA which improves the efficiency of Pure ALOHA is ________.

     1. Slotted ALOHA
     2. Upper ALOHA
     3. Integrated ALOHA
     4. Lower ALOHA

135. ________ is used in the Stop-and-Wait protocol to overcome the issue of duplication.

     1. Frame sequencing
     2. Acknowledgement numbering
     3. Counter and Timer reset
     4. Frame sequencing and Acknowledgement numbering

136. No matter whether the link is dedicated or broadcast, data link control (DLC) layer provides services between ________.

     1. Virtual LANs
     2. Two adjacent nodes
     3. Ethernet links
     4. Source and destination PCs

137. What is the period of a Sine wave having frequency of 5 Hz?

     1. 0.2
     2. 0.1
     3. 0.5
     4. 0.3

138. Which of the following sublyer resolves the contention for the shared media.

     1. MAC
     2. LLC
     3. Physical
     4. None of the given.

139. A fiber -optic cable transmit signals in the form of ________.

     1. Light
     2. Sound
     3. Wave
     4. None of the given

140. A sine wave is ___________.

     1. periodic and discrete
     2. aperiodic and discrete
     3. periodic and continuous
     4. aperiodic and continuous

141. In CSMA/CA, ________ is the amount of time divided into slots.

     1. Interframe Window
     2. Contention Window
     3. Fragmented Window
     4. Collided Window

142. Low pass channel has ________ bandwidth between two stations.

     1. Dedicated
     2. Shared
     3. Multiplexed
     4. Infinite

143. If the window size is 63 in go-back N ARQ then what is the range of sequence number?

     1. 0 to 63
     2. 0 to 64
     3. 1 to 63
     4. 1 to 64

144. In ASK, Noise usually affects the ________.

     1. Amplitude
     2. Phase
     3. Sample
     4. Frequency

145. The flag in PPP is a byte that needs to be ________ whenever it appears in the data section of the frame.

     1. Duplicated
     2. Blocked
     3. Cleaned
     4. Escaped

146. The original Ethernet technology with the data rate of 10 Mbps is called ________?

     1. Standard Ethernet
     2. Fast Ethernet
     3. Gigabit Ethernet
     4. 10 Gigabit Ethernet

147. Signals travel through fiber optic cable are in the form of ________.

     1. Light
     2. Bits
     3. Electromagnetic
     4. Bytes

148. In the ________ method, the stations in a network are orgamized in a logical ring.

     1. Token-passing
     2. Polling
     3. Reservation
     4. None of the given

149. What is the period of a Sine wave having frequency of 2 Hz?

     1. 0.2
     2. 0.1
     3. 0.5
     4. 0.3

150. Quadrature Amplitude Modulation (QAM) is the combination of ________ and ________.

     1. FSK, PSK
     2. PSK, FSK
     3. ASK, PSK
     4. ASK, FSK

151. Normally the value of Kmax in pure ALOHA is ________.

     1. 25
     2. 10
     3. 15
     4. 30

152. There are __________types of guided media.

     1. 2
     2. 3
     3. 4
     4. 5

153. Flow control is needed to prevent ________.

     1. Bit errors
     2. Overflow of the sender buffer
     3. Overflow of the receiver buffer
     4. Collision between sender and receiver

154. Which one of the following is not a Channelization Protocol?

     1. FDMA
     2. CSMA
     3. CDMA
     4. TDMA

155. A portion of the path that carries TX between a given pair of devices is known as ___________.

     1. Direct Point
     2. Bridge
     3. Channel
     4. Access Point

156. ________ mode of serial transmission guarantees fixed rate of data.

     1. Synchronous
     2. Asynchronous
     3. Isochronous
     4. Metasochronous

157. Which one is not the function of data link layer?

     1. Line discipline
     2. Flow control
     3. Error control
     4. Network control

158. GO-BACK-N protocol is one of the ________ layer protocols, which is used to control the flow of data during the transmission.

     1. Physical
     2. Network
     3. Presentation
     4. Data link

159. In selective-reject ARQ, only the specific damaged or lost frame is ________.

     1. Retransmitted
     2. Forwarded
     3. Selected
     4. Rejected

160. BSC supports ___________ transmission using ___________ flow control.

     1. Full-duplex, Stop and wait ARQ
     2. Half-duplex, Selective reject ARQ
     3. Full-duplex, Selective reject ARQ
     4. Half-duplex, Stop and wait ARQ

161. ________ relatively measures the strength of two signals.

     1. Signal rate
     2. Bit rate
     3. Decibel
     4. Pulse Rate

162. DLC in Data Link Layer stands for ________.

     1. Divide Line Communication
     2. Data Line Code
     3. Data Link Control
     4. Demand Link Coordination

163. Error correction is more ________ than the error detection.

     1. Easy
     2. Useless
     3. Informal
     4. Difficult

164. ________ is correct formula to determine the total number of ports needed for one system connected in a mesh network.

     1. N+1
     2. N-1
     3. N(N+1)
     4. NxN

165. In Pure ALOHA, the vulnerable time is ________ the frame transmission time.

     1. Same as
     2. Two times
     3. Three times
     4. Four times

166. To make sure that source does not overwhelm destination by sending data faster than it can be handled and processed is called?

     1. Addressing & Routing
     2. Exchange Management
     3. Flow Control
     4. Recovery

167. The ________ is the number of signal elements sent per unit time.

     1. Data rate
     2. Signal rate
     3. Bit rate
     4. Period

168. In Block coding we divide our message into blocks of k bits called as ________.

     1. Code words
     2. Data words
     3. Passwords
     4. Cross words

169. Line Configuration refers to the way two or more devices attach to a ___________.

     1. Path
     2. Circuit
     3. Link
     4. Router

170. TROPOSHERE is the layer of atmosphere above the troposhere but below space

     1. True
     2. False

171. YMODEM has ________ Byte of data unit.

     1. 1024
     2. 256
     3. 128
     4. 512

172. Asynchronous transmission is ___________.

     1. Slow
     2. Fast
     3. Costly
     4. None effective

173. WDM stands for _________.

     1. Wave Division Multiplexing
     2. Wrong Division Multiplexing
     3. Well Division Multiplexing
     4. West Division Multiplexing

174. Time division multiplexing is used in ________ systems.

     1. Analog
     2. Hybrid
     3. Digital
     4. Automated

175. Error detection and correction are the services provided by ________ layer.

     1. Data link layer
     2. Application layer
     3. Physical layer
     4. Session layer

176. Quantization is a method of assigning ________ values in a specific range to sampled instances.

     1. Negative
     2. Positive
     3. Binary
     4. Integral

177. In order to find the location of two errors in an eight bit stream, we have to see ________ different combinations.

     1. 28
     2. 16
     3. 8
     4. 4

178. If a digital signal has "L" number of levels. ________ is the number of bits required to represent each level.

     1. Log L
     2. Log Base 2 L
     3. L Square
     4. Log(2*L)

179. Two or more computers connected so that they can communicate with each other and share information is called a ___________.

     1. satellite
     2. protocol
     3. broadcast
     4. network

180. A ________ modem is used to connect two DTEs directly.

     1. 'NULL
     2. Cable
     3. DSL
     4. None of the given

Select a course code for Objective Questions:

ACC311 ACC501 BIF101 BIF401 BIF501 BIO101 BIO201 BIO202 BIO203 BIO204 BIO301 BIO302 BIO303 BIO401 BIO503 BNK603 BT101 BT201 BT301 BT302 BT401 BT402 BT403 BT404 BT405 BT406 BT501 BT504 BT505 BT604 CHE201 CHE301 CS001 CS101 CS201 CS202 CS204 CS301 CS302 CS304 CS311 CS401 CS402 CS403 CS408 CS501 CS502 CS504 CS506 CS508 CS601 CS602 CS604 CS605 CS607 CS609 CS610 CS614 CS707 CS710 ECO401 ECO402 ECO403 ECO404 EDU302 EDU401 EDU402 EDU501 EDU601 ENG101 ENG201 ENG301 ENG501 FIN611 FIN624 FIN625 ISL201 IT430 MCM101 MCM301 MGMT623 MGT101 MGT211 MGT301 MGT401 MGT402 MGT501 MGT502 MGT503 MGT510 MGT601 MGT603 MKT501 MKT610 MKT630 MTH101 MTH202 MTH302 MTH501 MTH601 MTH634 PAK301 PHY101 PHY301 PSY101 PSY403 PSY502 PSY512 SOC101 SOC301 SOC401 STA301 STA630 STA641 ZOO102 ZOO401 ZOO501 ZOO502 ZOO503 ZOO504 ZOO505 ZOO506 ZOO510 ZOO630

Select a course code for Subjective Questions:

ACC311 CS001 CS101 CS201 CS301 CS607 CS701 CS702 CS703 CS704 CS707 CS708 CS710 CS711 CS718 CS721 CS724 ECO401 ECO403 ENG101 ENG301 MGT703 MTH501 STA301