FINALTERM EXAMINATION
Spring 2009
CS601- Data Communication
Time: 120 min
Marks: 80
Question No: 1 ( Marks: 1 ) - Please choose one
Which is not an element of protocol
► semantics
► timing
► communication service module
Question No: 2 ( Marks: 1 ) - Please choose one
Layers 5, 6 and 7 also called as network support layers.
► True
► False
Question No: 3 ( Marks: 1 ) - Please choose one
Fourier transform tells us that any digital signal can be decomposed into infinite number of periodic signals
► True
► False
Question No: 4 ( Marks: 1 ) - Please choose one
Time domain plot show changes in signal phase with respect to time.
► True
► False
Question No: 5 ( Marks: 1 ) - Please choose one
Analog to digital conversion is also termed as modulating an analog signal.
► True
► False
Question No: 6 ( Marks: 1 ) - Please choose one
DC component is also termed as Direct current component or a component with non-zero frequency.
► False
► True
Question No: 7 ( Marks: 1 ) - Please choose one
► biphase
► polar
► biphase & polar
► none of the given
Question No: 8 ( Marks: 1 ) - Please choose one
The inversion of the level at 1 bit is called as __________
► NRZ-L
► NRZ-I
► RZ
Question No: 9 ( Marks: 1 ) - Please choose one
PCM is the first process of PAM.
► True
► False
Question No: 10 ( Marks: 1 ) - Please choose one
In 4PSK each phase change represents ______bits.
► 3
► 6
► 2
► 4
Question No: 11 ( Marks: 1 ) - Please choose one
In RS 422 Balanced mode two lines carry ________ signals which are not identical to each other.
► same
► different
► digital
► analog
Question No: 12 ( Marks: 1 ) - Please choose one
A ______________ converts an analog signal into a digital signal.
► Demodulator
► Modulator
► Digital-to-analog converter
Question No: 13 ( Marks: 1 ) - Please choose one
Which of the following is an example of ITU-T modem standards:
► T-series
► X-series
► N-series
► V-series
Question No: 14 ( Marks: 1 ) - Please choose one
The maximum data rate in the uploading direction is still ____________.
► 26.6 Kbps
► 33.6 Kbps
► 36.6 Kbps
► 46.6 Kbps
Question No: 15 ( Marks: 1 ) - Please choose one
Which of the following primarily uses guided media
► Cellular telephone system
► Local telephone system
► Satellite communications
► Radio broadcasting
Question No: 16 ( Marks: 1 ) - Please choose one
When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, ____________occurs.
► Reflection
► Refraction
► Incidence
► Criticism
Question No: 17 ( Marks: 1 ) - Please choose one
When we talk about unguided media, usually we are referring to _________.
► Metallic wires
► Nonmetallic wires
► The air
► Water
Question No: 18 ( Marks: 1 ) - Please choose one
Optical fibers are defined by the ratio of the ___________ of their core to the diameter of their cladding.
► Diameter
► Radius
► Length
► Width
Question No: 19 ( Marks: 1 ) - Please choose one
All of popular Fiber optic connectors are ___________ shaped.
► Conical
► Barrel
► Circular
► Rectangular
Question No: 20 ( Marks: 1 ) - Please choose one
Radio wave transmission utilizes ___________ different types of propagation.
► Four
► Three
► Two
► Five
Question No: 21 ( Marks: 1 ) - Please choose one
dB is ____________ if a signal is amplified.
► Negative
► Positive
► Null
► Zero
Question No: 22 ( Marks: 1 ) - Please choose one
A prism can deflect the light depending upon the angle of ____________ and the frequency.
► Deviation
► Incident
► Refraction
► Reflection
Question No: 23 ( Marks: 1 ) - Please choose one
Asynchronous TDM is efficient only when the size of the time slot is kept relatively _______________
► Large
► Small
► Medium
► None of the given
Question No: 24 ( Marks: 1 ) - Please choose one
The local loop has ___________ cable that connects the subscriber telephone to the nearest end office.
► Twisted-pair
► Coaxial
► Fiber-optic
► None of the given
Question No: 25 ( Marks: 1 ) - Please choose one
Data from a computer are ____________; the local loop handles _________ signals.
► Analog; analog
► Analog; digital
► Digital; digital
► Digital; analog
Question No: 26 ( Marks: 1 ) - Please choose one
Which error detection method uses ones complement arithmetic?
► Simple parity check
► Two-dimensional parity check
► CRC
► Checksum
Question No: 27 ( Marks: 1 ) - Please choose one
Flow control is needed to prevent ____________
► Bit errors
► Overflow of the sender buffer
► Overflow of the receiver buffer
► Collision between sender and receiver
Question No: 28 ( Marks: 1 ) - Please choose one
____________ coordinates the amount of data that can be sent before receiving acknowledgment
► flow control
► error control
► data control
Question No: 29 ( Marks: 1 ) - Please choose one
Error control is both error _________ and error ___________
► detection; correction
► detection; deletion
► detection; avoidance
► detection; forwarding
Question No: 30 ( Marks: 1 ) - Please choose one
Addressing is not needed in _______________ configuration.
► Point to Point
► Multipoint
► Point to point and multipoint
Question No: 31 ( Marks: 1 ) - Please choose one
In a Go-Back-N ARQ, if the window size is 63, what is the range of sequence number?
► 0 to 63
► 0 to 64
► 1 to 63
► 1 to 64
Question No: 32 ( Marks: 1 ) - Please choose one
A timer is set when ___________ is sent out.
► A data frame
► An ACK
► A NAK
Question No: 33 ( Marks: 1 ) - Please choose one
Sliding window requires that data frames be transmitted _______________
► Sequentially
► Frequently
► Synchronously
► Asynchronously
Question No: 34 ( Marks: 1 ) - Please choose one
In Y-MODEM Multiple files can be sent simultaneously
► True
► False
Question No: 35 ( Marks: 1 ) - Please choose one
BLAST stands for :
► Blocked asynchronous transmission
► Blocked synchronous transmission
► Barrel asynchronous transmission
► Below asynchronous transmission
Question No: 36 ( Marks: 1 ) - Please choose one
HDLC is an acronym for ______________.
► High-duplex line communication
► High-level data link control
► Half-duplex digital link combination
► Host double-level circuit
Question No: 37 ( Marks: 1 ) - Please choose one
The HDLC ___________ field defines the beginning and end of a frame.
► Flag
► Address
► Control
► FCS
Question No: 38 ( Marks: 1 ) - Please choose one
_________ is the access protocol used by traditional Ethernet.
► CSMA/CD
► CSMA/CA
► Token Ring
► CSMA
Question No: 39 ( Marks: 1 ) - Please choose one
Bridges can divide a large ________ into smaller segments
► Network
► Packet
► Frame
► Address
Question No: 40 ( Marks: 1 ) - Please choose one
Like VRC, LRC and CRC, Checksum is also based on _______________.
► Redundency
► Decimal Division
► Encryption
► Encoding
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