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Friday, December 24, 2010

CS601- Data Communication Complete Finalterm paper 2010

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 )
 What's the name of the telephone service in which there is no need of dialing.



Question No: 35      ( Marks: 3 )


How Bit Rate & Baud rate are related?




Question No: 36      ( Marks: 3 )
 Following abbreviations stands for what?
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 )
 what is the difference between character oriented and bit oriented protocols?



Question No: 40      ( Marks: 5 )



Write down the function of Primary-Secondary communication in line discipline.


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