MIDTERM EXAMINATION
Spring 2010
CS601- Data Communication
Time: 60 min
Marks: 40
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Q No. | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | |
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Q No. | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | |
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Q No. | 25 | 26 | |||||||
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Question No: 1 ( Marks: 1 ) - Please choose one
The information to be communicated in a data communications system is the
► Medium
► Protocol
► Message
► Transmission
Question No: 2 ( Marks: 1 ) - Please choose one
Which is not an element of protocol
► semantics
► timing
► communication service module
Question No: 3 ( Marks: 1 ) - Please choose one
Line configuration refers to the way two or more devices attach to a ______.
► Link
► Circuit
► Route
► Node
Question No: 4 ( Marks: 1 ) - Please choose one
_________requires the maximum number of I/O ports.
► Bus
► Star
► Mesh
► Ring
Question No: 5 ( Marks: 1 ) - Please choose one
Which topology requires a central controller or hub?
► Mesh
► Star
► Bus
► Ring
Question No: 6 ( Marks: 1 ) - Please choose one
Layers 5, 6 and 7 also called as network support layers.
► True
► False
Question No: 7 ( Marks: 1 ) - Please choose one
Internet with small “i” specifies the world wide Network the actual internet.
► True
► False
Question No: 8 ( Marks: 1 ) - Please choose one
Data link layer deals with mechanical and electrical specifications of transmission medium and interface
► True
► False
Question No: 9 ( Marks: 1 ) - Please choose one
Data synchronization is a function related with ___________
► session layer
► presentation layer
► transport
Question No: 10 ( Marks: 1 ) - Please choose one
OSI model was developed prior to TCP/IP model.
► True
► False
Question No: 11 ( 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: 12 ( Marks: 1 ) - Please choose one
A signal that repeats a pattern over a regular interval of time is called_______.
► periodic signal
► analog signal
► composite signal
Question No: 13 ( Marks: 1 ) - Please choose one
Frequency band in which 99% of the total power resides is called_______
► power bandwidth
► half power bandwidth
► 3dB bandwidth
► F.M.
Question No: 14 ( Marks: 1 ) - Please choose one
In differential Manchester we require two transition or signal changes to represent binary_____
► zero
► one
► both zero and one
Question No: 15 ( Marks: 1 ) - Please choose one
In Alternate mark inversion the term mark comes from_________
► telegraphy
► telephony
► digital telephony
Question No: 16 ( Marks: 1 ) - Please choose one
A 56k modem can download at a rate of __________ Kbps and upload at a rate of __________ Kbps.
► 33.6: 33.6
► 33.6: 56.6
► 56.6: 33.6
► 56.6: 56.6
Question No: 17 ( Marks: 1 ) - Please choose one
The bit rate always equals the baud rate in which type of signal?
► FSK
► QAM
► 4-PSK
► PSK
Question No: 18 ( Marks: 1 ) - Please choose one
Asynchronous transmission is ___________
► slow
► costly
► non-effective
► fast
Question No: 19 ( Marks: 1 ) - Please choose one
At the ______________layer, a DCE takes data generated by a DTE.
► physical
► transport
► data link
► application
Question No: 20 ( Marks: 1 ) - Please choose one
_________ requires more bandwidth.
► FSK
► ASK
► PSK
► QAM
Question No: 21 ( Marks: 2 )
Define Sampling Rate.
Question No: 22 ( Marks: 2 )
Write down the types of digital to analog modulation.
Question No: 23 ( Marks: 3 )
What is periodic signal?
Question No: 24 ( Marks: 3 )
How bandwidth of a Modem is measured?
Question No: 25 ( Marks: 5 )
Briefly describe Rerturn to Zero (RZ) encoding scheme?
Question No: 26 ( Marks: 5 )
Compare Phase Modulation(PM) with Frequency Modulation(FM)?
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