Data Communication (CS601)

1. 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

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

   1. True
   2. False

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

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

4. 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

5. 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

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

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

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

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

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

   1. True
   2. False

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

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

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

    1. true
    2. false

11. 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

12. 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)

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

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

14. 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

15. 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

16. 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

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

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

18. 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

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

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

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

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

21. 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

22. In ASK, Noise usually affects the ________.

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

23. 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

24. 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)

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

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

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

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

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

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

29. 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

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

    1. true
    2. false

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

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

32. ________ 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

33. There are __________types of guided media.

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

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

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

35. Session layer is responsible for _________.

    1. Reassembly of data
    2. Maintaining the connection

36. 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

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

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

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

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

39. Latency is made of ________ components.

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

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

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

41. 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

42. 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

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

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

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

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

45. WDM stands for _________.

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

46. 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

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

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

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

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

49. ________ is sometimes called the bit rate.

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

50. 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

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

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

52. 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

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

    1. true
    2. false

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

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

55. ________ contains a repeater.

    1. Active hub
    2. Passive hub

56. 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

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

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

58. 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

59. 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

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

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

61. A sine wave is ___________.

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

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

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

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

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

64. 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

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

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

66. ________ 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

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

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

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

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

69. 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

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

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

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

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

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

    1. Circuit switching
    2. Packet switching

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

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

74. 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

75. 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

76. 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

77. POST stand for ________?

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

78. WDM stands for ________.

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

79. 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

80. Time division multiplexing is used in ________ systems.

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

81. ________ 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

82. 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

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

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

84. 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

85. RZ stands for ___________.

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

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

    1. True
    2. False

87. PSK is susceptible to the noise degradation.

    1. True
    2. False

88. AM signal requires ___________ the BW of original signal

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

89. There are _________ types of serial transmission.

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

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

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

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

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

92. DLC in Data Link Layer stands for ________.

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

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

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

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

    1. Yes
    2. No

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

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

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

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

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

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

98. 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

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

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

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

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

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

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

102. Central Hub in a Tree is an ___________.

     1. Active hub
     2. passive hub

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

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

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

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

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

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

106. 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

107. 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

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

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

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

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

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

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

111. Radio is an example of _______ signal conversion.

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

112. Analog signals are refers to be ___________

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

113. Asynchronous transmission is ___________.

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

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

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

115. Sampling means measuring ____________ of signal at equal intervals

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

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

     1. Transport Layer
     2. Session Layer

117. 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

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

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

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

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

120. 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

121. YMODEM has ________ Byte of data unit.

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

122. 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

123. 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

124. ________ encoding is almost obsolete today

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

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

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

126. 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

127. ________ 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

128. Digital signals are refered to be ___________.

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

129. 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

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

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

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

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

132. A sine wave is defined by ___________ characteristics.

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

133. 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

134. dB is negative if a signal is ___________.

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

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

     1. True
     2. False

136. 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

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

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

138. 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

139. 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

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

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

141. 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

142. 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

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

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

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

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

145. ________ 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

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

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

147. 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

148. 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

149. 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

150. 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

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

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

152. 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

153. 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

154. 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

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

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

156. 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

157. There are ________ basic categories of multiplexing.

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

158. 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

159. 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

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

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

161. 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

162. ________ 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

163. 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

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

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

165. 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

166. Human voice is example of ___________ signal.

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

167. 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

168. CDMA stands for ________.

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

169. ________ relatively measures the strength of two signals.

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

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

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

171. 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

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

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

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

     1. true
     2. false

174. 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

175. 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

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

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

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

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

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

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

179. 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

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

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

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