CS601- Data Communication final term paper 2011



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

Sponsored Links




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.