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Friday, February 25, 2011

CS601 Unsolved Final Term Paper

FINALTERM  EXAMINATION
Fall 2009
CS601- Data Communication
Time: 120 min
Marks: 85

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 As layer 4 is read by Bs __________ 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?


By ADEEL ABBAS, Bhakkar. AdeelAbbasbk@gmail.com

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