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Thursday, February 24, 2011

FINALTERM EXAMINATION solved CS601- Data Communication paper

FINALTERM  EXAMINATION
Spring 2010
CS601- Data Communication
Time: 90 min
Marks: 60

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


When data are transmitted from device A to device B, the header from A’s layer 4 is read by B’s __________ layer.

       physical

       transport

       application

       none of the given


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


A periodic signal completes one cycle in 0.001 s. What is the frequency?

       1 Hz

       100 Hz

       1 KHz

       1 MHz


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


Zero crossing bandwidth is also called as equivalent noise bandwidth.

       True

       False


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


Amplitude in ASK is more resistive to EMI and Noise.

       True

       False


Question No: 5      ( 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: 6      ( Marks: 1 ) - Please choose one


There are _________________ types of serial transmission:

       1

       ► 2

       3

       4


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


Synchronous transmission have _____________.

       a start bit

       a stop bit

       ga
ps between bytes
       none of the given


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


Which of the following is an example of ITU-T modem standards:

       T-series

       X-series

       N-series

       V-series


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


The maximum data rate in the uploading direction is still ____________.


       26.6 Kbps

       33.6 Kbps

       36.6 Kbps

  46.6 Kbps


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


All of popular Fiber optic connectors are ___________ shaped.

       Conical

       Barrel

       Circular

       Rectangular


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


The VLF and LF bands use _________ propagation for communications.

       Ground

       Sky

       Line of sight

       Space


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


Multiplexing is the set of techniques that allows simultaneous TX of multiple signals across  ___________ data link


       Single

       Multi

       Single and Multi

       none of the given


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


Need for Addressing makes Asynchronous TDM inefficient for bit or byte ___________.

       Interleaving

       Addition

       Substraction

       None of the given


Question No: 15      ( 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: 16      ( Marks: 1 ) - Please choose one


A traditional telephone line has a bandwidth of __________.

       2000Hz

       4000 Hz

       2000 MHz

       4000 MHz


Question No: 17      ( 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: 18      ( Marks: 1 ) - Please choose one


At the CRC generator, __________ added to the data unit after the division process

       0s are

       1s are

       The polynomial

       The CRC remainder is


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


Error control in the data link layer is based on ________________

       automatic repeat request

       automatic repeat acknowledgment

       automatic send acknowledgment


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


In line discipline the initiator first transmits a frame called an ________

       Enquiry

       Acknowledgment

       NAK

       Request


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


Primary device uses ____________ to receive transmission from the secondary devices.

       ACK

       ENQ

   POLL


Question No: 22      ( 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: 23      ( Marks: 1 ) - Please choose one


For stop-and-wait ARQ, for N data packets sent, ___________ acknowledgments are needed.


       N

       2N

       N-1

       N+1


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


In Y-MODEM Multiple files can be sent simultaneously

       True

       False


Question No: 25      ( 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: 26      ( Marks: 1 ) - Please choose one


Token Bus has no commercial application in data communications

       True

       False


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


The BNC-T connector is a T-shaped device with _______ ports

       Three

       Two

       Four

       Five


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


Each station in the Token Ring regenerates the frame.

       True

       False


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


Repeater works on __________     layer.

       Data Link

       Physical

       Network

       Application


Question No: 30      ( Marks: 1 ) - Please choose one


Trunks are transmission media such as _________ that handle the telephone to the nearest end office.

       Satellite links

       Twisted-pair & Fiber-optic

       Twisted-pair

       Fiber-optic


Question No: 31      ( Marks: 2 )


What kind of error is undetectable by the checksum? [2]

Error detection method used by the higher layers like VRC,LRC,CRC,checksum is also based on the concept of redundancy
                       
Question No: 32      ( Marks: 2 )


What are properties of signals?


Question No: 33      ( Marks: 2 )


Whether in Asynchronous or Synchronous TDM, addressing is used?


Question No: 34      ( Marks: 2 )


What is the basic purpose of Router?


Question No: 35      ( Marks: 3 )


Why we need a Null Modem?


Question No: 36      ( Marks: 3 )


Count LRC for the following bits?
10011010  10100101   1101 0110


Question No: 37      ( Marks: 3 )


what are the categories of multiplexing?
There are three catogaries of  multiplxing
FDM
TDM
Have a two other catagories
 Synchronous and asyrounce


WDM

Question No: 38      ( Marks: 3 )


What are the three purposes of control frames at data link layer?


Question No: 39      ( Marks: 5 )


Compare line decipline methods ENQ/ACK and Poll/ Select?
=>ENQ/ACK coordinates which device may start a transmission and whether or not the intended recipient is ready and enabled.

=> Using ENQ/ACK, a session can be initiated by either station on a link as long as both are of equal rank.

=> In both half-duplex and full-duplex transmission, the initiating device establishes the session.

=> In half duplex, the initiator then sends its data while the responder waits. The responder may take over the link when the initiator is finished or has requested a response.

=> In full duplex, both devices can transmit simultaneously once the session has been established. 

POLL/SELECT:

=> The poll/select method of line discipline works with topologies where one device is designated as a primary station and the other devices are secondary stations.

=> Multipoint systems must coordinate several nodes, not just two.

=> The question to be determined in these cases, therefore, is more than just, are you ready? It is also, which of the several nodes has the right to use the channel?
www.allvupastpapers.blogspot.com




Question No: 40      ( Marks: 5 )


what is the difference between character oriented and bit oriented protocols?


By ADEEL ABBAS, Bhakkar. AdeelAbbasbk@gmail.com

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