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Thursday, December 23, 2010

CS601- Data Communication Finalterm Paper 2009

FINALTERM  EXAMINATION
Spring 2009
CS601- Data Communication
Question No: 1      ( Marks: 1 ) - Please choose one


There are how many factors on which the performance of a network depends?

       Three

       Five

       Four

       Two



Question No: 2      ( Marks: 1 ) - Please choose one


_________requires the maximum number of I/O ports.

       Bus

       Star

       Mesh

       Ring


Question No: 3      ( Marks: 1 ) - Please choose one


Headers are added at layers 1 and 7 of OSI model.

       True

       False



Question No: 4      ( Marks: 1 ) - Please choose one


Trailer is only added at ________layer of OSI model.

       data link

       physical

       network

       application



Question No: 5      ( Marks: 1 ) - Please choose one


A sine wave must be an analog signal.

       True

       False



Question No: 6      ( Marks: 1 ) - Please choose one


If there is __________in voltage then the frequency is infinite.

       instantaneous change

       continuous change

       no change



Question No: 7      ( Marks: 1 ) - Please choose one


The inversion of the level at 1 bit is called as __________

       NRZ-L

       NRZ-I

       RZ



Question No: 8      ( Marks: 1 ) - Please choose one


The last process in PCM is _________ digital data into digital signal.


       encoding

       decoding

       modulating



Question No: 9      ( Marks: 1 ) - Please choose one


Amplitude in ASK is more resistive to EMI and Noise.

       True

       False



Question No: 10      ( Marks: 1 ) - Please choose one


If FCC regulations are followed, the carrier frequencies of adjacent AM radio stations are ____________ apart.

       5 KHz

       10 KHz

       200 KHz

       530 KHz


Question No: 11      ( Marks: 1 ) - Please choose one


In _____________ transmission, a start bit and a stop bit frame a character byte.

       Asynchronous serial

       Synchronous serial

       Parallel

       Asynchronous & Synchronous serial



Question No: 12      ( Marks: 1 ) - Please choose one


Synchronous transmission have _____________.

       a start bit

       a stop bit

       gaps between bytes

       none of the given



Question No: 13      ( Marks: 1 ) - Please choose one


Transmission media are usually categorized as _____________

       Fixed or Unfixed

       Guided or Unguided

       Determinate or Indeterminate

       Metallic or Nonmetallic


Question No: 14      ( Marks: 1 ) - Please choose one


The RG number gives us information about ________.

       Twisted pairs

       Coaxial cables

       Optical fibers

       all of the given



Question No: 15      ( Marks: 1 ) - Please choose one


Radio wave and microwave frequencies range from _________.

       3 to 300 KHz

       300 KHz to300 KHz to 3 GHz

       3 KHz to 300 GHz

       3 KHz to 3000 GHz

Question No: 16      ( Marks: 1 ) - Please choose one


All of popular Fiber optic connectors are ___________ shaped.

       Conical

       Barrel

       Circular

       Rectangular



Question No: 17      ( Marks: 1 ) - Please choose one


In ______________ method a signal can be directed in a straight from Antenna to antenna.

       Line of sight

       Ground propagation

       Sky propagation

       Microwaves


Question No: 18      ( Marks: 1 ) - Please choose one


Amplifiers are used to __________the signal to heat.

       Amplify

       Rectify

       Testify

       NUllify



Question No: 19      ( Marks: 1 ) - Please choose one


There are ________ basic categories of multiplexing.

       3

       4

       2

       5



Question No: 20      ( Marks: 1 ) - Please choose one


If a T-1 carries 8000 frames, the data rate is ___________

       2.544 Mbps

       1.544 Mbps

       1.544 Kbps

       1.544 Gbps



Question No: 21      ( Marks: 1 ) - Please choose one


FTTC stands for _____________

       flexible to the curb

       fiber to the curb

       fiber to the cable

       fiber to the center



Question No: 22      ( Marks: 1 ) - Please choose one


Optical signals are multiplexed using _________ at switching office to create wider BW optical signals

       WDM

       FDM

       TDM

       MUX


Question No: 23      ( Marks: 1 ) - Please choose one


Which error detection method consists of a parity bit for each unit as well as an entire data unit of parity bits?

       Simple parity check

       Two-dimensional parity check

       CRC

       Checksum



Question No: 24      ( Marks: 1 ) - Please choose one


If the ASCII character G is sent and the character D is received, what type of error is this?

       Single-bit

       Multiple-bit

       Burst

       Recoverable


Question No: 25      ( Marks: 1 ) - Please choose one


Flow control is needed to prevent ____________

       Bit errors

       Overflow of the sender buffer

       Overflow of the receiver buffer

       Collision between sender and receiver


Question No: 26      ( Marks: 1 ) - Please choose one


In data link layer, communication requires at least ___________ devices working together

       3

       2

       4

       5



Question No: 27      ( Marks: 1 ) - Please choose one


Data link control is composed of ____________ important functions.

       2

       3

       4

       5


Question No: 28      ( Marks: 1 ) - Please choose one


Error control is both error _________ and error ___________

       detection; correction

       detection; deletion

       detection; avoidance

       detection; forwarding


Question No: 29      ( Marks: 1 ) - Please choose one


ENQ/ACK stands for______________

       Enquiry/ Acknowledgment

       Enque/ Acknowledgment

       Enquist/ Acknowledgment

       none of the given



Question No: 30      ( 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: 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


Which of the following combines features of the other two.

       ZMODEM

       YMODEM

       XMODEM

       None of given



Question No: 33      ( Marks: 1 ) - Please choose one


BLAST stands for :

       Blocked asynchronous transmission

       Blocked synchronous transmission

       Barrel asynchronous transmission

       Below asynchronous transmission


Question No: 34      ( 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: 35      ( Marks: 1 ) - Please choose one


The HDLC ___________ field defines the beginning and end of a frame.


       Flag

       Address

       Control

       FCS



Question No: 36      ( Marks: 1 ) - Please choose one


The shortest frame in HDLC protocol is usually the _________ frame.

       Information

       Supervisory

       Management

       None of the given



Question No: 37      ( Marks: 1 ) - Please choose one


The PDU  has no flag fields, no CRC, and no station address

       TRUE

       FALSE



Question No: 38      ( Marks: 1 ) - Please choose one


_________ is the access protocol used by traditional Ethernet.

       CSMA/CD

       CSMA/CA

       Token Ring

       CSMA



Question No: 39      ( Marks: 1 ) - Please choose one


Repeater is an amplifier, not a regenerator.

       True

       False


Question No: 40      ( Marks: 1 ) - Please choose one


Bridges can divide a large ________ into smaller segments

       Network

       Packet

       Frame

       Address


Question No: 41      ( Marks: 2 )


Stop-and- wait ARQ has two control variables S and R. What are their functions? [2]

Go-back-n ARQ
Selective Reject ARQ

Question No: 42      ( Marks: 2 )

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



Question No: 43      ( Marks: 2 )


What is meant by Transmission Impairments?



Question No: 44      ( Marks: 3 )


How does the checksum checker know that the received data unit is undamaged? [3]


Question No: 45      ( Marks: 3 )


What is Geosynchronous satellite?


.
Question No: 46      ( Marks: 3 )

Following abbreviations stands for?
1.      ARP     
2.      RARP   
3.      ICMP    

Question No: 47      ( Marks: 5 )


Name and discuss briefly the bits in the HDLC control field. [5]


Question No: 48      ( Marks: 5 )


Describe method of checksum briefly?





Question No: 49      ( Marks: 5 )


What is satellite communication?



Question No: 50      ( Marks: 10 )


In how many ways TDM can be implemented? Describe any one with example.


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