Sunday, January 15, 2012

CS601 Final Term Past Paper


FINALTERM  EXAMINATION
Fall 2009
CS601- Data Communication
Ref No: 1140267
Time: 120 min
Marks: 85
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Exam Date:




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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 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?

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