FINALTERM EXAMINATION
Spring 2010
CS601- Data Communication
Time: 90 min
Marks: 60
Question No: 1 ( Marks: 1 ) - Please choose one
Encryption and encoding are the same terms.
► True
► False
Question No: 2 ( Marks: 1 ) - Please choose one
Traditional modems are wide spread now to a data rate of __________.
► 56 Kbps
► 72 Kbps
► 42 Kbps
► 96 Kbps
Question No: 3 ( Marks: 1 ) - Please choose one
Bi phase encoding is a type of bipolar encoding in which we use two voltage levels.
► True
► False
Question No: 4 ( Marks: 1 ) - Please choose one
The _______________ layer changes bits into electromagnetic signals.
► physical
► data link
► transport
► none of given
Question No: 5 ( Marks: 1 ) - Please choose one
Which is not an element of protocol
► semantics
► timing
► communication service module
Question No: 6 ( Marks: 1 ) - Please choose one
A telephone network is an example of a __________ network.
► Packet-switched
► Circuit-switched
► Message-switched
► none of the given
Question No: 7 ( 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: 8 ( Marks: 1 ) - Please choose one
Secondary hub in a tree must be a passive hub.
► True
► False
Question No: 9 ( Marks: 1 ) - Please choose one
In case of uploading at the switching station, data is converted to digital signal using ___________.
► TCP
► PCM
► ICP
► TDM
Question No: 10 ( Marks: 1 ) - Please choose one
Category 5 UTP cable is used for data transmission of upto__________.
► 100 Mbps
► 200 Mbps
► 250 Mbps
► 400 Mbps
Question No: 11 ( 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: 12 ( Marks: 1 ) - Please choose one
Ultra high-frequency waves always use __________ propagation.
► Ground
► Sky
► Line of Sight
► Space
Question No: 13 ( Marks: 1 ) - Please choose one
Distortion occurs in a ___________ signal.
► Rectified
► Composite
► Amplified
► none of the given
Question No: 14 ( Marks: 1 ) - Please choose one
Which of the following are not used to measure the performance of TX Media.
► Throughput
► Propagation Speed
► Propagation Time
► none of the given
Question No: 15 ( Marks: 1 ) - Please choose one
A portion of the path that carries TX b/w a given pair of devices is known as __________.
► Node
► Bridge
► Channel
► Gateway
Question No: 16 ( Marks: 1 ) - Please choose one
_________ takes data from one high speed line and breaks it into portions.
► Multiplexing
► Inverse multiplexing
► Inverse subtraction
► Inverse addition
Question No: 17 ( Marks: 1 ) - Please choose one
The _________ layer is the layer closest to the transmission medium.
► physical
► data link
► network
► transport
Question No: 18 ( Marks: 1 ) - Please choose one
In primary-secondary communication ______________ is always the initiator of a session
► Primary
► Secondary
► Sender
► Receiver
Question No: 19 ( Marks: 1 ) - Please choose one
YMODEM has _________Byte of data unit.
► 1024
► 256
► 128
► 512
Question No: 20 ( 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: 21 ( Marks: 1 ) - Please choose one
If the ASCII character H is sent and the character I is received, what type of error is this?
► Single-bit
► Multiple-bit
► Burst
► Recoverable
Question No: 22 ( Marks: 1 ) - Please choose one
In __________ ARQ, if a NAK is received, only the specific damaged or lost frame is retransmitted.
► Stop-and-wait
► Go-Back-N
► Selective repeat
► Stop-and-wait & Go-back-N
Question No: 23 ( Marks: 1 ) - Please choose one
Data link protocols can be divided into ______________ sub-groups.
► two
► three
► four
► five
Question No: 24 ( Marks: 1 ) - Please choose one
If odd parity is used for ASCII error detection, the number of 0s per 8-bit symbol is _________
► Even
► Odd
► Indeterminate
► 42
Question No: 25 ( Marks: 1 ) - Please choose one
In Y-MODEM Multiple files can be sent simultaneously
► True
► False
Question No: 26 ( Marks: 1 ) - Please choose one
The PDU has no flag fields, no CRC, and no station address
► TRUE
► FALSE
Question No: 27 ( Marks: 1 ) - Please choose one
Check sum method is used for _______________ layers.
► Physical
► Application
► Transport
► Datalink
Question No: 28 ( Marks: 1 ) - Please choose one
Repeater is an amplifier, not a regenerator.
► True
► False
Question No: 29 ( Marks: 1 ) - Please choose one
RARP stands for Reverse Address Resolution Protocol.
► True
► False
Question No: 30 ( Marks: 1 ) - Please choose one
The BNC-T connector is a T-shaped device with _______ ports
► Three
► Two
► Four
► Five
Question No: 31 ( Marks: 2 )
What is hybrid topology?
Question No: 32 ( Marks: 2 )
What is combined station of HDLC?
Question No: 33 ( Marks: 2 )
What kind of error is undetectable by the checksum?
Question No: 34 ( Marks: 2 )
Question No: 35 ( Marks: 3 )
How Bit Rate & Baud rate are related?
Question No: 36 ( Marks: 3 )
1. ARP
2. RARP
3. ICMP
Question No: 37 ( Marks: 3 )
Differentiate between Polling and Selecting.
Question No: 38 ( Marks: 3 )
T lines are designed for Digital data how they can be used for Analog Transmission ?
Question No: 39 ( Marks: 5 )
Question No: 40 ( Marks: 5 )
Write down the function of Primary-Secondary communication in line discipline.
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