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VU CS601 -, DATA COMMUNICATION, FINALTERM, solve,d unsolved, past papers, Spring 2009

VU CS601 -, DATA COMMUNICATION, FINALTERM, Solve,d Unsolved, Past Papers, Spring 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. 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.

 

 

VU CS601 -, DATA COMMUNICATION, FINALTERM, Solve,d Unsolved, Past Papers, Spring 2009

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