FINALTERM EXAMINATION
Fall 2009
CS601- Data Communication
Ref No:
Time: 120 min
Marks: 85
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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
A set of devices connected by communication links is called networking
► True
► False
Question No: 3 ( Marks: 1 ) - Please choose one
Internet with small “i” specifies the world wide Network the actual internet.
► True
► False
Question No: 4 ( Marks: 1 ) - Please choose one
Data chunk at data link layer is called________
► frame
► packet
► datagram
Question No: 5 ( Marks: 1 ) - Please choose one
Data synchronization is a function related with ___________
► session layer
► presentation layer
► transport
Question No: 6 ( Marks: 1 ) - Please choose one
When data are transmitted from device A to device B, the header from A’s layer 4 is read by B’s __________ layer.
► physical
► transport
► application
► none of the given
Question No: 7 ( Marks: 1 ) - Please choose one
Data must be converted into__________ before transmission.
► signal
► wave
► electric pulse
Question No: 8 ( Marks: 1 ) - Please choose one
PCM is the first process of PAM.
► True
► False
Question No: 9 ( Marks: 1 ) - Please choose one
In _____________ transmission, bits are transmitted over a single wire, one at a time.
► Asynchronous serial
► Synchronous serial
► Parallel
► Asynchronous & Synchronous serial
Question No: 10 ( Marks: 1 ) - Please choose one
EIA 232 allows for a maximum bit rate of __________Kbps.
► 40
► 30
► 20
► 10
Question No: 11 ( 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: 12 ( Marks: 1 ) - Please choose one
A parabolic dish antenna is a(n) ______________ antenna.
► Omnidirectional
► Bidirectional
► Unidirectional
► Horn
Question No: 13 ( Marks: 1 ) - Please choose one
Ultra high-frequency waves always use __________ propagation.
► Ground
► Sky
► Line of Sight
► Space
Question No: 14 ( Marks: 1 ) - Please choose one
Middle frequency waves having range 300 KHz-3 MHz always use __________ propagation.
► Ground
► Sky
► Line of Sight
► Space
Question No: 15 ( Marks: 1 ) - Please choose one
dB is ____________ if a signal is attenuated.
► Negative
► Positive
► Null
► Zero
Question No: 16 ( Marks: 1 ) - Please choose one
Which multiplexing technique involves signals composed of light beams?
► FDM
► TDM
► WDM
► none of the given
Question No: 17 ( Marks: 1 ) - Please choose one
Multiplexing has long been used as an essential tool in the ____________.
► Electronic industry
► Telephone industry
► Space science
► VLAN
Question No: 18 ( 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: 19 ( 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: 20 ( Marks: 1 ) - Please choose one
Which error detection method involves polynomials?
► Checksum
► Two-dimensional parity check
► CRC
► Simple parity check
Question No: 21 ( Marks: 1 ) - Please choose one
In CRC there is no error if the remainder at the receiver is ____________
► Equal to the remainder at the sender
► Zero
► Nonzero
► The quotient at the sender
Question No: 22 ( Marks: 1 ) - Please choose one
In CRC the quotient at the sender _____________
► Becomes the dividend at the receiver
► Becomes the divisor at the receiver
► is discarded
► is the remainder
Question No: 23 ( Marks: 1 ) - Please choose one
Which error detection method can detect a bust error?
► The parity check
► Two-dimensional parity check
► CRC
► Two-dimensional parity check and CRC
Question No: 24 ( Marks: 1 ) - Please choose one
At the CRC checker, ________ means that the data unit is damaged
► A string of 0s
► A string of 1s
► A string of alternating 1s and 0s
► A nonzero remainder
Question No: 25 ( Marks: 1 ) - Please choose one
Error control is both error _________ and error ___________
► detection; correction
► detection; deletion
► detection; avoidance
► detection; forwarding
Question No: 26 ( Marks: 1 ) - Please choose one
In line discipline the initiator first transmits a frame called an ________
► Enquiry
► Acknowledgment
► NAK
► Request
Question No: 27 ( Marks: 1 ) - Please choose one
In line discipline after the data transmission, the sending system finishes with an _____________ frame
► EOT
► EKT
► ENT
► ESP
Question No: 28 ( Marks: 1 ) - Please choose one
In primary-secondary communication ______________ is always the initiator of a session
► Primary
► Secondary
► Sender
► Receiver
Question No: 29 ( Marks: 1 ) - Please choose one
Primary device uses ____________ to receive transmission from the secondary devices.
► ACK
► ENQ
► POLL
Question No: 30 ( 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: 31 ( Marks: 1 ) - Please choose one
Sliding window requires that data frames be transmitted _______________
► Sequentially
► Frequently
► Synchronously
► Asynchronously
Question No: 32 ( Marks: 1 ) - Please choose one
Data link protocols can be divided into ______________ sub-groups.
► two
► three
► four
► five
Question No: 33 ( Marks: 1 ) - Please choose one
XMODEM is a ______________ protocol designed for telephone-line communication b/w PCs.
► file transfer
► hardware
► software
► application exchange
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
Which of the following combines features of the other two.
► ZMODEM
► YMODEM
► XMODEM
► None of given
Question No: 36 ( Marks: 1 ) - Please choose one
BLAST stands for :
► Blocked asynchronous transmission
► Blocked synchronous transmission
► Barrel asynchronous transmission
► Below asynchronous transmission
Question No: 37 ( Marks: 1 ) - Please choose one
Which one of the following uses full duplex operation with sliding window flow control.
► BLAST
► XMODEM
► YMODEM
► ZMODEM
Question No: 38 ( 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: 39 ( Marks: 1 ) - Please choose one
The DSAP and SSAP are addresses used by _________ to identify the protocol stacks.
► LLC
► MAC
► Network
Question No: 40 ( Marks: 1 ) - Please choose one
The PDU has no flag fields, no CRC, and no station address
► TRUE
► FALSE
Question No: 41 ( Marks: 1 ) - Please choose one
Which of the following is a bus topology LAN that uses base band signaling and has a max. segment length of 500 meters
► 10 Base5
► 10 Base2
► 100 Base2
► 100 Base5
Question No: 42 ( Marks: 1 ) - Please choose one
Token Bus has no commercial application in data communications
► True
► False
Question No: 43 ( Marks: 1 ) - Please choose one
The BNC-T connector is a T-shaped device with _______ ports
► Three
► Two
► Four
► Five
Question No: 44 ( Marks: 1 ) - Please choose one
_________ is the access protocol used by traditional Ethernet.
► CSMA/CD
► CSMA/CA
► Token Ring
► CSMA
Question No: 45 ( Marks: 1 ) - Please choose one
When a collision is detected in a network using CSMA/CD. _________
► The frame is immediately resent
► A jam signal is sent by the station
► The backoff value is set to 0
► The backoff value is decremented by 1
Question No: 46 ( Marks: 1 ) - Please choose one
Like VRC, LRC and CRC, Checksum is also based on _______________.
► Redundency
► Decimal Division
► Encryption
► Encoding
Question No: 47 ( Marks: 1 ) - Please choose one
Check sum method is used for _______________ layers.
► Physical
► Application
► Transport
► Datalink
Question No: 48 ( Marks: 1 ) - Please choose one
Repeater works on __________ layer.
► Data Link
► Physical
► Network
► Application
Question No: 49 ( Marks: 1 ) - Please choose one
When systems share a point to point link, then protocols used are called ___________ protocols.
► Direct
► Indirect
► Monolithic
► structured
Question No: 50 ( Marks: 1 ) - Please choose one
_________ requires more bandwidth.
► FSK
► ASK
► PSK
► QAM
Question No: 51 ( Marks: 2 )
Whether Hamming code is the technique used for error detection or error correction?
Question No: 52 ( Marks: 2 )
What are Guard Bands in Multiplexing?
Question No: 53 ( Marks: 2 )
Which type of frames are present in BSC frames?
Question No: 54 ( Marks: 3 )
What are the fractional T Lines?
Question No: 55 ( Marks: 3 )
What are the light sources used for optic fiber?
Question No: 56 ( Marks: 3 )
Write names of Link Access Protocols developed by ITU-T?
Question No: 57 ( Marks: 5 )
Question No: 58 ( Marks: 5 )
What is Troposphere and Ionosphere?
Question No: 59 ( Marks: 10 )
What is CSMA/CD. Why it is needed?
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