CS601 Data Communication Spring 2009 Final Term Paper

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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 sigh
► 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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