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Share ur current paper here. Thanks

 

see the attached files pls

 

CS601_Spring_2010_Final_Term_Solved_Paper.doc

Spring 2010_FinalTerm_OPKST_CS601_mc090407150_13-08-2010.doc

CS601 Spring 2010 Final term Paper.doc

Spring_2010_FinalTerm_OPKST_CS601_dc10020002.doc

 

 

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07-08-2010
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01 more 07-08-2010

See the attached file pls
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08-08-2010
See the attached file pls
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13-08-2010 CS601 Spring 2010 Final Term Paper
see the attached file pls
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14-08-2010
CS601 Spring 2010 Final Term Solved paper
See the attached file pls
Attachments:
Question No: 1 ( Marks: 1 ) - Please choose one


__________representation of links that connect nodes is called as physical topology.

► geometrical

► logical

► physical



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


The internet model consists of _________ layers.

► three

► two

► five

► seven



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


Encryption and encoding are the same terms.

► True

► False



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


The amplitude of a digital signal depends upon the________ to represent a bit.

► phase

► voltage

► wavelength



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


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

► NRZ-L

► NRZ-I

► RZ



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


Modulation of an analog signal can be accomplished through changing the ___________ of the carrier signal.

► amplitude

► frequency

► phase

► all of the given



Question No: 7 ( 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: 8 ( 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: 9 ( Marks: 1 ) - Please choose one


The RG number gives us information about ________.

► Twisted pairs

► Coaxial cables

► Optical fibers

► all of the given



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


The inner core of an optical fiber is __________ in composition.

► Glass plastic

► Copper

► Bimetallic

► Liquid



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


A portion of the path that carries TX b/w a given pair of devices is known as __________.

► Node

► Bridge

► Channel

► Gateway



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


Which error detection method involves polynomials?

► Checksum

► Two-dimensional parity check

► CRC

► Simple parity check



Question No: 16 ( 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: 17 ( Marks: 1 ) - Please choose one


Which error detection method involves the use of parity bits?

► Simple parity check & two dimensional parity check

► CRC

► Two-dimensional parity check

► Simple parity check



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


Which error detection method can detect a single-bit error?

► Simple parity check

► Two-dimensional parity check

► CRC

► All of the given



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


The Hamming code is a method of __________

► Error detection

► Error correction

► Error ecapsulation

► Error detection & Error encapsulation



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


Sliding window requires that data frames be transmitted _______________

► Sequentially

► Frequently

► Synchronously

► Asynchronously



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


In selective-reject ARQ, only the specific damaged or lost frame is_____________.

► Retransmitted

► Forwarded

► Selected

► Rejected



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


Which of the following sublyer, resolves the contention for the shared media

► MAC

► LLC

► Physical



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


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

► TRUE

► FALSE



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


IEEE divides the base band category into ______ standards.

► 5

► 4

► 3

► 6



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


Like 10 Base 5, 10 Base 2 is a _________ topology LAN

► Ring

► Mesh

► Star

► Bus



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


Check sum method is used for _______________ layers.

► Physical

► Application

► Transport

► Datalink



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


Repeater works on __________ layer.

► Data Link

► Physical

► Network

► Application



Question No: 28 ( 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: 29 ( Marks: 1 ) - Please choose one


Which of the following ___________ uses a series of filters to decompose multiplexed signal into its constituent signals.

► MUX

► DEMUX

► Switch

► Bridge



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


In Fast Ethernet, data rate can be increased by _______________ collisions.

► Increasing

► Decreasing

► Keeping Constant

► None of the given



Question No: 31 ( Marks: 2 )


What are the advantages of a multipoint connection over a point-to-point connection?
Answer:
Point-to-point connection is limited to two devices, where else more than two devices share a single link in multipoint connection. Multipoint connection can be used for fail-over and reliability.


Question No: 32 ( Marks: 2 )


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

Answer:

DSS (digital data service) is the telephone service in which there is no need of dialing.




Question No: 33 ( Marks: 2 )


Which type of frames are present in BSC frames?

Answer:
There are two types of frames that are present in BSC.
1. Control Frames and
2. Data Frames




Question No: 34 ( Marks: 2 )


What methods of line discipline are used for peer to peer and primary secondary communication?
Answer:
Line discipline is done in two ways:
1. ENQ/ACK (Enquiry Acknowledgement)

This is used for peer to peer communication.
2. Poll/ Select
This method is used for primary secondary communication.


Question No: 35 ( Marks: 3 )


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

Answer:

Checksum Checker or generator:
The sender subdivides data units into equal segments of ‘n’ bits(16 bits)
1. These segments are added together using one’s complement.
2. The total (sum) is then complemented and appended to the end of the original data unit as redundancy bits called CHECKSUM.
3. The extended data unit is transmitted across the network.
4. The receiver subdivides data unit and adds all segments together and complement the result.
5. If the intended data unit is intact, total value found by adding the data segments and the checksum field should be zero.
6. If the result is not zero, the packet contains an error & the receiver rejects it.







Question No: 36 ( Marks: 3 )


Which one has more overhead, a repeater or a bridge? Explain your answer. [3]

Answer:
A bridge has more overhead than a repeater. A bridge processes the packet at two
layers ; a repeater processes a frame at only one layer. A bridge needs to search a
table and find the forwarding port as well as to regenerate the signal; a repeater
only regenerates the signal. In other words, a bridge is also a repeater (and more); a
repeater is not a bridge.


Question No: 37 ( Marks: 3 )


Write down disadvantages of Ring Topology.

Answer:
Disadvantages of Ring Topology

Unidirectional Traffic
A break in a ring that is a disabled station can disable the entire network

Can be solved by using:
Dual Ring or
A switch capable of closing off the Break



Question No: 38 ( Marks: 3 )


How parity bits are counted in VRC error detection method technique in case of odd parity generator?

Answer:
For example:
We want to TX the binary data unit 1100001
Adding together the number of 1’s gives us 3, an odd number
Before TX, we pass the data unit through a parity generator, which counts the 1’s and appends the parity bit (1) to the end
The total number of 1’s is now 4, an even number
The system now transfers the entire expanded across the network link

When it reaches its destination, the RX puts all 8 bits through an even parity checking function
If the RX sees 11100001, it counts four ones, an even number and the data unit passes
When the parity checker counts the 1’s, it gets 5 an odd number
The receiver knows that an error has occurred somewhere and therefore rejects the whole unit
Some systems may also use ODD parity checking
The principal is the same as even parity







Question No: 39 ( Marks: 5 )


How are lost acknowledgment and a lost frame handled at the sender site? [5]




Question No: 40 ( Marks: 5 )


Explain Protocol Data Unit (PDU)?


Answer:
Protocol data unit (PDU) is an OSI term that refers generically to a group of information added or removed by a particular layer of the OSI model. In specific terms, an LxPDU implies the data and headers defined by layer x. Each layer uses the PDU to communicate and exchange information. The PDU information is only read by the peer layer on the receiving device and then stripped off, and data is handed over to the next upper layer.
it can help you all becasue there are 30 MCQs in my paper and all from attached file
Attachments:
Q#1 what are the conditions for the polynomial used by the CRC generator? [2]
Q#2 writes down names of the control frames in XMODEM? [3]
Q#3 defines frequency Modulation? [3]
Q#4 what is ETX in data frames of data link layer? [3]
Q#5 what are three types of digital service? [3]
Q#6 what is selective Reject ARQ in slicing window? [5]
Q#7 Give methods of Analog to Analog conversion? [2]
Q#8 whether in Asynchronous or Synchronous TDM, addressing in used?
Q#9 what is the basic purpose of Router?
Q#10 what are the possible consequences of replacing a bridge with a routes?

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