MCQS

CS601

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Exam Term : Final Total MCQS : 287 Prepared By :

1 - First commercial modems are developed in 1. 2. 3. 4.

1947 1950 1960 1970 Correct Choice : 4

From Lectuer # 23 www.vugujranwala.com

2 - Traditional modem's uploading data rate is 1. 2. 3. 4.

33.3kbps 33.5kbps 33.6kbps 56kbps Correct Choice : 3


3 - In traditional modem, maximum data rate in downloading direction is 1. 2. 3. 4.



f actor that makes coaxial cable less susceptible to noise than 4 - What is the major factor twisted-pair cable? 1. 2. 3. 4.

Outer conductor Inner conductor Diameter of cable Insulating material Correct Choice : 1


5 - Transmission media are usually categorized as _____________ 1. 2. 3. 4.

Fixed or Unfixed Guided or Unguided Determinate or Indeterminate Metallic or Nonmetallic Correct Choice : 2 From Lectuer # 24 www.vugujranwala.com

6 - Radio wave and microwave frequencies range from _________. 1. 2. 3. 4.

3 to 300 KHz 300 KHz to300 KHz to 3 GHz 3 KHz to 300 GHz 3 KHz to 3000 GHz

1 - First commercial modems are developed in 1. 2. 3. 4.

1947 1950 1960 1970 Correct Choice : 4


2 - Traditional modem's uploading data rate is 1. 2. 3. 4.



3 - In traditional modem, maximum data rate in downloading direction is 1. 2. 3. 4.



f actor that makes coaxial cable less susceptible to noise than 4 - What is the major factor twisted-pair cable? 1. 2. 3. 4.

Outer conductor Inner conductor Diameter of cable Insulating material Correct Choice : 1


5 - Transmission media are usually categorized as _____________ 1. 2. 3. 4.

Fixed or Unfixed Guided or Unguided Determinate or Indeterminate Metallic or Nonmetallic Correct Choice : 2 From Lectuer # 24 www.vugujranwala.com

6 - Radio wave and microwave frequencies range from _________. 1. 2. 3. 4.

3 to 300 KHz 300 KHz to300 KHz to 3 GHz 3 KHz to 300 GHz 3 KHz to 3000 GHz

Correct Choice : 3


7 - Classes of Transmission Media are _________ 1. 2. 3. 4.

Electromagnetic Spectrum Coxial and Twisted Cable Media Guided and Unguided Media None of Given Correct Choice : 3 From Lectuer # 24 www.vugujranwala.com

8 - _______ cable consists of an inner copper core and a second conducting outer sheath. 1. 2. 3. 4.

Coaxial Twisted-pair Fiber-optic Shielded twisted-pair Correct Choice : 1


9 - In fiber optics the signal source is ____________waves. ____________waves. 1. 2. 3. 4.

Light Radio Infrared Very Low frequency Correct Choice : 1


10 - In data link layer, communication requires at least ___________ devices working 10 together. 1. 2. 3. 4.

3 2 4 1 Correct Choice : 2


11 - Category 1 UTP cable is most often used in _______ networks. 11 1. 2. 3. 4.

Infrared Telephone Fast Ethernet Traditional Ethernet Correct Choice : 2


12 - The _______ is an association that sponsors the use of infrared waves. 12 1. 2. 3.

EIA IrDA FCC

4.

PUD Correct Choice : 2


13 - BNC connectors are used by _______ cables 13 1. 2. 3. 4.

Fiber-optic UTP STP Coaxial Correct Choice : 4


14 - In CRC there is no error if the remainder at the receiver is _______. 14 1. 2. 3. 4.

Nonzero The quotient at the sender Equal to the remainder at the sender Zero Correct Choice : 4 From Lectuer # 24 www.vugujranwala.com

15 - BW of the local loop telephone line is 15 1. 2. 3. 4.

4kHz 4bps 33.6kHZ 56 kHZ Correct Choice : 1


www.vugujranwala.com

17 - Metal cables use 17 1. 2. 3. 4.

Voice band frequency Radio frequency visible light both a and b Correct Choice : 1


18 - Electromagnetic signal can not travel through 18 1. 2. 3. 4.

Vavuum air Transmission media none of these Correct Choice : 4


19 - Classes of transmission media 19 1.

1

2. 3. 4.

2 3 4 Correct Choice : 2


20 - Higher grades of STP cables are used in many LAN technologies including ethernet and token ring 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 2


21 - Categories of UTP ccbles is 1. 2. 3. 4.



22 - In which categories, the next higher grade, suitable for voice and data transmission of up to 4Mbps 1. 2. 3. 4.

Category 0 Category 1 Category 2 Category 3 Correct Choice : 3


23 - _______ is the propagation method subject to the greatest distortion. 1. 2. 3. 4.

Single-mode Multimode step-index Multimode graded-index Multimode single-index Correct Choice : 2


24 - The material of core and cladding in fiber optic cable is same. 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 1


25 - STP is more expensive than UTP and is less susceptible to noise

1. 2. 3. 4.

TRUE FALSE

Correct Choice : 1


26 - STP can eliminate a phenomenon called Crosstalk 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 1


27 - In fiber optic cable, the signal source is__________ waves 1. 2. 3. 4.

Infrared Light Radio Very Low Frequency Correct Choice : 2


28 - The RG number gives us information about ________. 1. 2. 3. 4.

Twisted pairs Coaxial cables Optical fibers all of the given Correct Choice : 2


29 - Transmission media are usually categorized as _______. 1. 2. 3. 4.

Guided or unguided Fixed or unfixed Determinate or indeterminate Metallic or nonmetallic Correct Choice : 1 From Lectuer # 25 www.vugujranwala.com

30 - The RG number gives us information about _______. 1. 2. 3. 4.

Optical fibers Twisted pairs Coaxial cables All the above Correct Choice : 3


31 - The inner core of an optical fiber is _______ in composition.

1. 2. 3. 4.

Copper Bimetallic Glass or plastic Liquid Correct Choice : 3


32 - When we talk about unguided media, usually we are referring to _______. 1. 2. 3. 4.

Metallic wires Nonmetallic wires The air None of the above Correct Choice : 3


33 - In an environment with many high-voltage devices, the best transmission medium would be _________. 1. 2. 3. 4.

Twisted-pair cable Coaxial cable The atmosphere Optical fiber Correct Choice : 4


34 - Optical fibers, unlike wire media, are highly resistant to _______. 1. 2. 3. 4.

High-frequency transmission Low-frequency transmission Refraction Electromagnetic interference Correct Choice : 4 From Lectuer # 25 www.vugujranwala.com

35 - STP is more expensive than UTP but is less susceptible to noise 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 1


36 - Range of coaxial cable 1. 2. 3. 4.

10kHZ to 100 kHz 100kHz to 500khz 100khz to 500MHz 500Mhz to 1GB Correct Choice : 3




39 - Reflection occurs when 1. 2. 3. 4.

angle of incidence becomes less than critical angle angle of refraction becomes less than critical angle angle of refracted becomes greater than critical angle angle of incidence becomes greater than critical angle Correct Choice : 4 From Lectuer # 25 www.vugujranwala.com



42 - Cable that connects the subscriber telephone to the nearest end office in a local loop is called _______ 1. 2. 3. 4.

Twisted-pair cable Coaxial cable Fiber-optic cable Subscriber cable Correct Choice : 1


43 - Which of the following is not a guided medium? 1. 2. 3. 4.

Twisted Pair Fiber Optic Cable Coaxial Cable Atmosphere Correct Choice : 4


44 - In an environment with many high-voltage devices, the best transmission medium would be _________. 1. 2. 3. 4.

Atmosphere Coaxial Cable Twisted Pair Fiber Optic Cable Correct Choice : 1


45 - Troposhpheric Propagation is in two ways light of sight and broadcast. 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 1


46 - Ionosphere is the layer of atmosphere above the troposhere but below space 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 1


47 - In ______________ method a signal can be directed in a straight from Antenna to antenna. 1. 2. 3. 4.

Line of sight Ground propagation Sky propagation Microwaves Correct Choice : 1


48 - ________ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium. 1. 2. 3. 4.

Attenuation Distortion Noise Decibel Correct Choice : 1


49 - _________ can impair a signal. 1. 2. 3. 4.

Attenuation Distortion Noise All of the above Correct Choice : 1


50 - All of popular Fiber optic connectors are ___________ shaped. 1. 2. 3. 4.

Conical Barrel Circular Rectangular Correct Choice : 2


51 - ________ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal. 1. 2.

Attenuation Distortion

3. 4.

Noise Decibel Correct Choice : 2


52 - ________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal. 1. 2. 3. 4.



53 - In asynchronous transmission, the gap time between bytes is _______. 1. 2. 3. 4.

Fixed A function of the data rate Variable Zero Correct Choice : 3 From Lectuer # 26 www.vugujranwala.com

54 - Synchronous transmission does not have _______. 1. 2. 3. 4.

A start bit A stop bit Gaps between bytes All the above Correct Choice : 4


55 - When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, _______ occurs. 1. 2. 3. 4.

Refraction Reflection Incidence Criticism Correct Choice : 2


56 - Which of the following is not a guided medium? 1. 2. 3. 4.

Twisted-pair cable Fiber-optic cable Atmosphere Coaxial cable Correct Choice : 3


57 - Smoke signals are an example of communication through _______.

1. 2. 3. 4.

A guided medium A refractive medium An unguided medium A small or large medium Correct Choice : 3


58 - Which of the following primarily uses guided media? 1. 2. 3. 4.

Cellular telephone system Satellite communications Local telephone system Radio broadcasting Correct Choice : 3 From Lectuer # 26 www.vugujranwala.com

59 - Radio wave and microwave frequencies range from _______. 1. 2. 3. 4.

3 to 300 KHz 300 KHz to 3 GHz 3 KHz to 300 GHz 3 KHz to 3000 GHz Correct Choice : 3


60 - When the angle of incidence is _______ the critical angle, the light beam bends along the interface. 1. 2. 3. 4.

More than Less than Equal to None of the above Correct Choice : 3


61 - Which one is not the function of data link layer? 1. 2. 3. 4.

Line discipline Flow control Error control Network control Correct Choice : 4


62 - In an optical fiber, the inner core is _______ the cladding. 1. 2. 3. 4.

Less dense than Denser than The same density as Another name for Correct Choice : 2


63 - ________ is a type of transmission impairment in which the signal loses strength due

to the resistance of the transmission medium. 1. 2. 3. 4.



64 - ________ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal. 1. 2. 3. 4.



65 - ________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal. 1. 2. 3. 4.



66 - _________ can impair a signal. 1. 2. 3. 4.

Attenuation Distortion Noise All of the above Correct Choice : 1


67 - In asynchronous transmission, the gap time between bytes is _______. 1. 2. 3. 4.

Fixed A function of the data rate Variable Zero Correct Choice : 3 From Lectuer # 26 www.vugujranwala.com

68 - Synchronous transmission does not have _______. 1. 2. 3.

A start bit A stop bit Gaps between bytes

4.

All the above Correct Choice : 4


69 - Diameter of the core are expressed in 1. 2. 3. 4.

cm micro meters microns Correct Choice : 4



71 - ILD provide 1. 2. 3. 4.

Unfocused light Unfocused light long distance Focused light lon distance Focused light small distance Correct Choice : 3 From Lectuer # 26 www.vugujranwala.com






77 - Measures the relative strengths of two signals 1. 2. 3. 4.

Decibel Bandwidth Phase Wavelength Correct Choice : 1


78 - The VLF and LF bands use _______ propagation for communications. 1. 2. 3. 4.

Space Ground Sky Line of sight Correct Choice : 2


79 - A traditional telephone line has a bandwidth of __________. 1.

4000 Hz

2. 3. 4.

2000 Hz 2000 MHz 4000 MHz Correct Choice : 4


80 - A parabolic dish antenna is a(n) _______ antenna. 1. 2. 3. 4.

Omnidirectional Bidirectional Horn Unidirectional Correct Choice : 4




83 - HF use 1. 2. 3. 4.

Line of sight Ionospheric propagation Tronospheric propagation Broad cast Correct Choice : 2 From Lectuer # 27 www.vugujranwala.com




87 - Each service area is divided into small ranges 1. 2. 3. 4.

packets Cellular teliphony MTSO cells Correct Choice : 4


88 - Each cell office is controlled by a switching office called 1. 2. 3. 4.

cells MTS cellular telephony Mobile telephone switching office Correct Choice : 4 From Lectuer # 27 www.vugujranwala.com


90 - Negative dB means

1. 2. 3. 4.

Impairment Distortion Attenuation amplification Correct Choice : 3


91 - Positive dB means 1. 2. 3. 4.

Impairment Distortion Attenuation amplification Correct Choice : 4


92 - Distortion occur in 1. 2. 3. 4.

Signal Sine wave signal Composite signal EM signal Correct Choice : 3


93 - When propagation speed is multiplied by propagation time, we get the ________. 1. 2. 3. 4.

throughput wavelength of the signal distortion factor distance a signal or bit has traveled Correct Choice : 4 From Lectuer # 28 www.vugujranwala.com

94 - In fiber optics, the signal source is _______ waves. 1. 2. 3. 4.

Very low-frequency Light Radio Infrared Correct Choice : 2


95 - When propagation speed is multiplied by propagation time, we get the ________. 1. 2. 3. 4.

throughput wavelength of the signal distortion factor distance a signal or bit has traveled Correct Choice : 4 From Lectuer # 28 www.vugujranwala.com


97 - Due to random motion of electron 1. 2. 3. 4.

Thermal noise Induced noise Cross talk Spike Correct Choice : 1







103 - Data link protocols can be divided into ______________ sub-groups. 1. 2. 3. 4.

Two three four five Correct Choice : 1


104 - Data link protocols can be divided into ______________ sub-groups. 1. 2. 3. 4.

Two three four five Correct Choice : 1


105 - WDM stands for 1. 2. 3. 4.

Wave Division Multiplexing Wrong Division Multiplexing Well Division Multiplexing West Division Multiplexing Correct Choice : 1 From Lectuer # 29 www.vugujranwala.com

106 - In Synchronous TDM, Time slots are not same in number as input devices. 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 1


107 - Multiplexing is the set of techniques that allows simultaneous TX of multiple signals across a ___________ data link 1. 2. 3. 4.

Single Double Multi None of the given Correct Choice : 1


108 - There are ________ basic categories of multiplexing. 1. 2. 3. 4.



109 - WDM(wave division multiplexing) deals with 1. 2. 3. 4.

electric waves light waves both Correct Choice : 2


110 - Which one is not the function of data link layer? 1. 2. 3. 4.

Flow control Error control Network control Line discipline Correct Choice : 2


111 - Which of the following techniques takes data from one high speed line and breaks it into portions? 1. 2. 3. 4.

Inverse subtraction Inverse addition Multiplexing Inverse multiplexing Correct Choice : 3


112 - Time slots are dynamically allotted in _______________TDM technique. 1. 2. 3.

FDM Asynchronous WDM

4.

Synchronous Correct Choice : 4


113 - A prism can deflect the light depending upon the angle of ____________ and the frequency. 1. 2. 3. 4.

Deviation Incident Refraction Reflection Correct Choice : 4



115 - Data convert parrallel to series form, is the example of 1. 2. 3. 4.

Multiplexing Demultiplexing FDM TDM Correct Choice : 1


116 - MUX allocates exactly the same time slot to each device at all device whether or not the device has any thing to transmit 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 1


117 - Interleaving concept use in case of 1. 2. 3. 4.

FDM TDM WDM Synchronous Correct Choice : 2


118 - Prism can deflect the light depending upon the 1. 2. 3. 4.

Angle of refraction angle of incidence Critical angle both a and c Correct Choice : 2


119 - Inteleaving can done by

1. 2. 3. 4.

Bits Bytes other data unit all of these Correct Choice : 4



121 - Which multiplexing technique shifts each signal to a different carrier frequency? 1. 2. 3. 4.

FDM Synchronous TDM Asynchronous TDM None of the Above Correct Choice : 4


122 - Multiplexing has long been used as an essential tool in ______. 1. 2. 3. 4.

Electronic industry Telephone industry Space science VLAN Correct Choice : 2


123 - Asynchronous TDM is efficient only when the size of the time slot is kept relatively ________ 1. 2. 3. 4.

Large Medium Zero Small Correct Choice : 2


124 - Telephone network is an example of a __________ network. 1. 2. 3. 4.

Packet-switched Circuit-switched Message-switched Tele-switched Correct Choice : 4



126 - Asynchronous means 1. 2. 3.

flexible fixed Unstatistical

4.

both b and c Correct Choice : 1


127 - Need for addressing makes asynchronous TDM inefficient for bit or byte interleaving 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 1


128 - Asynchronous TDM is efficient only 1. 2. 3. 4.

when the size of the time slot is kept relativly large when the size of the timeslot is kept relativly small when the number of input are greater when the numberof input are smaller Correct Choice : 1 From Lectuer # 30 www.vugujranwala.com

129 - Telephone system application of 1. 2. 3. 4.

Asynchronous TDM Synchronous TDM Multiplexing Inverse Multiplexing Correct Choice : 3




132 - Digital services are less sensitive than analog ones 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 1


133 - Switched/56 service is already digital. Subcribers do not need modems they need 1. 2. 3. 4.

DDS DS USD DSU Correct Choice : 4


134 - DDS provide Max. date rate of

1. 2. 3. 4.

56kbps 64kbps 33 kbps 168 kbps Correct Choice : 2


135 - DS is a hierarchy of 1. 2. 3. 4.

FDM TDM Analog signal Digital signal Correct Choice : 4


136 - Error control is both error _________ and error ___________ 1. 2. 3. 4.

detection; correction detection; deletion detection; avoidance detection; forwarding Correct Choice : 1


137 - ______ Control refers to methods of error detection and correction? 1. 2. 3. 4.

Flow Error Transmission none of the above Correct Choice : 2


138 - T Lines are ___________ lines designed for digital data 1. 2. 3. 4.

Analog Digital Composite Telephone Correct Choice : 2


139 - Europeans use a version of T-lines called _________ 1. 2. 3. 4.

F-lines E-lines D-lines S-lines Correct Choice : 2


140 - FTTC stands for _____________

1. 2. 3. 4.

flexible to the curb fiber to the curb fiber to the cable fiber to the center Correct Choice : 2


141 - FTTC can be implemented in ______________. 1. 2. 3. 4.

Telephone system Cable System Telephone and Cable System Non of the above Correct Choice : 3 From Lectuer # 32 www.vugujranwala.com

142 - FTTC stands for ___________ 1. 2. 3. 4.

fiber to the center fiber to the cable fiber to the curb flexible to the curb Correct Choice : 3


143 - Which error detection method consists of a parity bit for each data unit as well as an entire data unit of parity bits? 1. 2. 3. 4.

Simple parity check Checksum Two-dimensional parity check CRC Correct Choice : 3 From Lectuer # 32 www.vugujranwala.com


145 - Error detection and correction is implemented 1. 2. 3. 4.

Data link layer Transport layer network layer both a and b Correct Choice : 4


146 - Which error detection method consists of just one redundant bit per data unit? 1. 2. 3. 4.

Simple parity check Two-dimensional parity check CRC Checksum Correct Choice : 1 From Lectuer # 33


147 - Which error detection method can detect a single-bit error? 1. 2. 3. 4.

Simple parity check Two-dimensional parity check CRC All of the given Correct Choice : 1 From Lectuer # 33 www.vugujranwala.com

148 - Which error detection method consists of just one redundant bit per data unit? 1. 2. 3. 4.

Two-dimensional parity check CRC Simple parity check Checksum Correct Choice : 3 From Lectuer # 33 www.vugujranwala.com

149 - Burst error is easily corrected then single bit error. 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 2


150 - Which of the following best describes a single-bit error? 1. 2. 3. 4.

A single bit is inverted A single bit is inverted per transmission A single bit is inverted per data unit Any of the above Correct Choice : 3 From Lectuer # 33 www.vugujranwala.com

151 - Which error detection method involves polynomials? 1. 2. 3. 4.

CRC Simple parity check Two-dimensional parity check Checksum Correct Choice : 1 From Lectuer # 33 www.vugujranwala.com

152 - In cyclic redundancy checking, what is the CRC? 1. 2. 3. 4.

The remainder The divisor The quotient The dividend Correct Choice : 1

From Lectuer # 33


153 - In CRC there is no error if the if the remainder at the receiver is 1. 2. 3. 4.

Equal to the Remainder of the sender Zero Non Zero The quotient at the sender Correct Choice : 2 From Lectuer # 33 www.vugujranwala.com

154 - In cyclic redundancy checking, the divisor is _______ the CRC. 1. 2. 3. 4.

The same size as 1 bit more than 1 bit less than 2 bits more than Correct Choice : 2


155 - At the CRC checker, _______ means that the data unit is damaged. 1. 2. 3. 4.

A string of alternating 1s and 0s A nonzero remainder A string of 0s A string of 1s Correct Choice : 2 From Lectuer # 33 www.vugujranwala.com

156 - If the ASCII character G is sent and the character D is received, what type of error is this? 1. 2. 3. 4.

Single-bit Multiple-bit Burst Recoverable Correct Choice : 3


157 - If the ASCII character H is sent and the character I is received, what type of error is this? 1. 2. 3. 4.

Burst Recoverable Single-bit Multiple-bit Correct Choice : 3


158 - If the data unit is 111111, the divisor 1010, and the remainder 110, what is the dividend at the receiver? 1. 2.

111111011 1010110

3. 4.

111111110 110111111 Correct Choice : 3


159 - At the CRC generator, _______ added to the data unit after the division process. 1. 2. 3. 4.

0s are 1s are The CRC remainder is The polynomial is Correct Choice : 3


160 - At the CRC generator, _______ added to the data unit before the division process. 1. 2. 3. 4.

A polynomial is A CRC remainder is 0s are 1s are Correct Choice : 3


161 - If the ASCII character G is sent and the character D is received, what type of error is this? 1. 2. 3. 4.

Single-bit Multiple-bit Burst Recoverable Correct Choice : 3


162 - If the data unit is 111111 and the devisor is 1010, what is dividend at the transmitter?

1. 2. 3. 4.

111111000 1111110000 111111 1111111010 Correct Choice : 4


163 - Given a 10-bit sequence 1010011110 and a divisor of 1011, CRC will be 1. 2. 3. 4.

001 000 100 101 Correct Choice : 4


164 - How does the CRC checker know that the received data unit is undamaged?

1. The CRC checker divides the received data by the predetermined divisor and accepts the data if the quotient is zero 2. The CRC checker divides the received data by the predetermined divisor and accepts the data if the remainder is one 3. The CRC checker divides the received data by the predetermined divisor and accepts the data if the remainder is less than zero 4. The CRC checker divides the received data by the predetermined divisor and accepts the data if the remainder is zero Correct Choice : 4 From Lectuer # 33 www.vugujranwala.com

165 - At the CRC checker, ________ means that the data unit is damaged. 1. 2. 3. 4.

A string of 0s A string of 1s A string of alternating 1s and 0s A nonzero remainder Correct Choice : 4 From Lectuer # 33 www.vugujranwala.com

166 - Which error detection method involves the use of parity bits? 1. 2. 3. 4.

Simple parity check Two-dimensional parity check CRC (a) and (b) Correct Choice : 4 From Lectuer # 33 www.vugujranwala.com

167 - If odd parity is used for ASCII error detection, the number of 0s per 8-bit symbol is _______. 1. 2. 3. 4.

Indeterminate 42 Even Odd Correct Choice : 4


168 - Which error detection method can detect a burst error? 1. 2. 3. 4.

The parity check Two-dimensional parity check CRC (b) and (c) Correct Choice : 4 From Lectuer # 33 www.vugujranwala.com


170 - Single bit error occur if we are sending data using 1.

Parallel TX

2. 3. 4.

Serial TX Packet Frame Correct Choice : 1


171 - Burst error mean 1. 2. 3. 4.

two or more bit sign the data unit have changed from 0 to 1 or from 1 to 0 Multiple bits are changed Does not necessarily mean that error occur in consecutive bit all of these Correct Choice : 4 From Lectuer # 33 www.vugujranwala.com


173 - it can not detect errors if the total number of error is even 1. 2. 3. 4.

VRC LRC Redundancy both a and b Correct Choice : 1



175 - Which erroe dectetion method involves polynomials? 1. 2. 3. 4.

Simple parity check Two-dimensional parity check CRC Checksum Correct Choice : 3 From Lectuer # 34 www.vugujranwala.com

176 - Which error detection method can detect a single-bit error? 1. 2. 3. 4.

Simple parity check Two-dimensional parity check CRC All the above Correct Choice : 4 From Lectuer # 34 www.vugujranwala.com



179 - The checksum of 0000 and 0000 is __________ 1. 2.

1111 0

3. 4.

1110 111 Correct Choice : 1


180 - Which error detection method uses ones complement arithmetic? 1. 2. 3. 4.

Simple parity check Two-Dimensional parity check CRC Checksum Correct Choice : 4 From Lectuer # 35 www.vugujranwala.com


Simple parity check Two-dimensional parity check CRC Checksum Correct Choice : 4 From Lectuer # 35 www.vugujranwala.com

182 - The sum of the checksum and data at the receiver is _______ if there are no errors. 1. 2. 3. 4.

-0 +0 The complement of the checksum The complement of the data Correct Choice : 1 From Lectuer # 35 www.vugujranwala.com

183 - Which of the following best describes a single-bit error? 1. 2. 3. 4.

A single bit is inverted A single bit is inverted per data unit A single bit is inverted per transmission None of the given Correct Choice : 2 From Lectuer # 35 www.vugujranwala.com


Simple parity check Checksum Two-dimensional parity check CRC Correct Choice : 2 From Lectuer # 35 www.vugujranwala.com

185 - Which of the following best describes a single-bit error? 1. 2.

A single bit is inverted. A single bit is inverted per transmission

3. 4.

A single bit is inverted per data unit. Any of the above Correct Choice : 3 From Lectuer # 35 www.vugujranwala.com

186 - The Hamming code is a method of _______. 1. 2. 3. 4.

Error detection Error correction Error encapsulation (a) and (b) Correct Choice : 4



188 - which option better explain the concept of checksum 1. 2. 3. 4.

one pattern remain elusive Detects most error involving on even number of bits Detects all error involving an odd number of bits all if these Correct Choice : 4 From Lectuer # 35 www.vugujranwala.com

189 - if a bit inversion is balanced by an opposite bit inversion in the corresponding digital of another segment 1. 2. 3. 4.

Error is dedected Error is Undedected Checksum error occur CRC error occur Correct Choice : 2


190 - Error correction can be done if 1. Receiver can ask sender for re TX 2. Receiver can use an error detecting code which automatically correct certain error 3. Receiver can use an error correcting code 4. both a and b Correct Choice : 4 From Lectuer # 35 www.vugujranwala.com

191 - In data link layer, communication requires at least ___________ devices working together 1. 2. 3. 4.


From Lectuer # 36


192 - Data link control is composed of ____________ important functions. 1. 2. 3. 4.




194 - Coordination of half duplex TX is a part pf a procedure called 1. 2. 3. 4.

Line discipline Flow control Error control all of these Correct Choice : 1


195 - Amount of data that can be sent before the receiving acknowledgment 1. 2. 3. 4.



196 - Coordinates the link systems, which device can send and when, it can send? 1. 2. 3. 4.



197 - Line discipline function of data link layer oversea 1. 2. 3. 4.

The establishment of devices Sight of a particular device to transmit a given time full duplex botha and c Correct Choice : 2 From Lectuer # 36 www.vugujranwala.com

198 - If the primary wants to receive data, it asks the second-arise if they have anything to send, this is called 1. 2.

POLLING SELECTING

3. 4.

None SELECTING None Polling Correct Choice : 1


199 - ENQ/ACK stands for______________ 1. 2. 3. 4.

Enquiry/ Acknowledgment Enque/ Acknowledgment Enquist/ Acknowledgment none of the given Correct Choice : 1 From Lectuer # 37 www.vugujranwala.com

200 - Flow control is needed to prevent ____________ 1. 2. 3. 4.

Bit errors Overflow of the sender buffer Overflow of the receiver buffer Collision between sender and receiver Correct Choice : 3 From Lectuer # 37 www.vugujranwala.com

201 - For point-to-point configuration, addressing is needed 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 2


202 - For point-to-point configuration, addressing is needed 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 2


203 - A timer is set when ___________ is (are) sent out. 1. 2. 3. 4.

A data frame An ACK A NAK All of given Correct Choice : 2


204 - Flow Control is the responsibility of _________ 1. 2.

Network Layer Transport Layer

3. 4.

Data Link Layer Physical Layer Correct Choice : 3


205 - If a T-1 carries 8000 frames, then data rate will be ___________ 1. 2. 3. 4.

2.544 Mbps 1.544 Mbps 1.544 kbps 1.544 Gbps Correct Choice : 2


206 - if the primary wants to recive data, it asks the second arise of they have anything to send called 1. 2. 3. 4.

Selecting Polling Half duplex Full duplex Correct Choice : 2


207 - if the primary want to send data, it tells the largest, secondary to get ready to receive called 1. 2. 3. 4.

Selecting Polling Half duplex Full duplex Correct Choice : 1


208 - For stop-and-wait ARQ, for n data packets sent, ___________ acknowledgments are needed. 1. 2. 3. 4.

n 2n N-1 N+1 Correct Choice : 1


209 - In the _____ Protocol, the sender sends one frame, stops until it receives confirmation from the receiver, and then sends the next frame? 1. 2. 3. 4.

Stop-and-Wait Simplest Go-Back-N ARQ Selective-Repeat ARQ Correct Choice : 1


210 - Flow control is needed to prevent ____________. 1. 2. 3. 4.

Collision between sender and receiver Overflow of the receiver buffer Overflow of the sender buffer Bit errors Correct Choice : 2 From Lectuer # 38 www.vugujranwala.com

211 - For a sliding window of size n-1 (n sequence numbers), there can be a maximum of __________ frames sent but unacknowledged. 1. 2. 3. 4.

0 N-1 N N+1 Correct Choice : 2


212 - ARQ stands for ___________ 1. 2. 3. 4.

Automatic repeat quantization Automatic repeat request Automatic retransmission request Acknowledge repeat request. Correct Choice : 2 From Lectuer # 38 www.vugujranwala.com

213 - In __________ ARQ, if a NAK is received, only the specific damaged or lost frame is retransmitted. 1. 2. 3. 4.

Stop and Wait Go-Back-N Selective repeat Stop-and-wait & Go-back-N Correct Choice : 3 From Lectuer # 38 www.vugujranwala.com



216 - In sliding window, frames are numbered module n mean from 0 to 1. 2. 3. 4.

n n-1 n+ 1 2n Correct Choice : 2



218 - Frame can be lost in tranmit if

1. 2. 3. 4.

Lost data frame lost ACK frame Lost NAK frame all of these Correct Choice : 4


219 - XMODEM is a ______________ protocol designed for telephone-line communication b/w PCs. 1. 2. 3. 4.

File transfer hardware software application exchange Correct Choice : 1


220 - Sliding window requires that data frames be transmitted _______________ 1. 2. 3. 4.

Sequentially Frequently Synchronously Asynchronously Correct Choice : 1


221 - In __________ ARQ, if a NAK is received, only the specific damaged or lost frame is retransmitted. 1. 2. 3. 4.

Stop-and-wait Go-Back-N Selective reject Stop-and-wait & Go-back-N Correct Choice : 3 From Lectuer # 39 www.vugujranwala.com


223 - In synchronous protocols 1. 2. 3. 4.

Treat each char ina a bit stream dependently Treat each char ina a bit stream independently traet the whole bit stream and chop it into char of equal size both b and c Correct Choice : 3 From Lectuer # 39 www.vugujranwala.com


225 - Control frames from the receiver 1. 2.

ACK NAK

3. 4.

CAN all of these Correct Choice : 4


226 - In X Modem 1. 2. 3. 4.

One CANs to abort transmission Two CANs to abort transmission Multiple files can be sent simultaneously both b and c Correct Choice : 1 From Lectuer # 39 www.vugujranwala.com

227 - BLAST stands for : 1. 2. 3. 4.

Blocked synchronous transmission Barrel asynchronous transmission Below asynchronous transmission Blocked asynchronous transmission Correct Choice : 4 From Lectuer # 40 www.vugujranwala.com

228 - Which of the following combines features of the other two. 1. 2. 3. 4.

ZMODEM YMODEM XMODEM None of given Correct Choice : 1


229 - The HDLC ___________ field defines the beginning and end of a frame. 1. 2. 3. 4.

Flag Address Control FCS Correct Choice : 1


230 - The shortest frame in HDLC protocol is usually the _________ frame. 1. 2. 3. 4.

Supervisory Management Information None of the given Correct Choice : 1


231 - In Y Modem 1. 2.

Multiple files can be sent simultaneously Two CANs to abort transmission

3. 4.

ITU-T CRC 16 for error checking all of these Correct Choice : 4 From Lectuer # 40 www.vugujranwala.com

232 - Protocols interpret a transmission frame or packet are succession of characters each usually compared of one byte 1. 2. 3. 4.

Byte Criented protocols Bit oriented protocol BSC both a nd b Correct Choice : 1


233 - BSC developed by IB in 1. 2. 3. 4.

1960 1964 1968 1970 Correct Choice : 2


234 - BSc is 1. 2. 3. 4.

Usable in point to point Usable in multiple communication Half duplex all of these Correct Choice : 4 From Lectuer # 40 www.vugujranwala.com

235 - if a fram is used stricly for control purpose called 1. 2. 3. 4.

Data purpose Data control purpose Control purpose bsc frame control Correct Choice : 3



237 - multi block frame 1. 2. 3. 4.

increase the likelihood of error detection text in a message is often divided b/w several block Several frames can carry continuation of single message all of these Correct Choice : 4 From Lectuer # 40 www.vugujranwala.com


239 - Shortest frame in HDLC protocols is usually the ____ frame. 1. 2. 3. 4.

Information Supervisory Management None of the above Correct Choice : 4



241 - Characterestic of HDLC is 1. 2. 3. 4.

Full duplex Point to pint Configaration all of these Correct Choice : 3







247 - The ending flag of 1 frame can not be used as the bedinning flag of the next frame 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 2



249 - The PDU has no flag fields, no CRC, and no station address 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 1


250 - The DSAP and SSAP are addresses used by ____to identify the protocol stack. 1. 2.

Network MAC

3. 4.

LLC None of the above Correct Choice : 2










259 - A device listens to the line before it transmit 1. 2. 3. 4.

Multiple Access Carrier Sense Collision Setection all of these Correct Choice : 2



261 - Ethernet LAN can support data rates between 1. 2. 3. 4.

1 to 100 kbps 1 to 100 Mbps 100 to 1000kbps 100 to 1000Mbps Correct Choice : 2



263 - In 10 base 2 1. 2. 3. 4.

No AUI cables are needed RG 8 BNC all of these Correct Choice : 1 From Lectuer # 43 www.vugujranwala.com


265 - Switched ethernet use an attempt to improve the perpormance of

1. 2. 3. 4.

100 base FX 100 base TX 10 base T 10 base T4 Correct Choice : 3


266 - In FDDI, THT stands for: 1. 2. 3. 4.

Token Hash Timer Tier Holding Timer Target Holding Timer Token Holding Timer Correct Choice : 4


267 - Acces control of token ring 1. 2. 3. 4.

Priority reservation time limits all of these Correct Choice : 4


268 - FDDI standardized by 1. 2. 3. 4.

ANSI ITU-T IEEE both a and b Correct Choice : 4


269 - In FDDI timers, which timers incrementing 1. 2. 3. 4.

THT TRT TTRT AMT Correct Choice : 2


270 - In FDDI timers, which timers decrementing 1. 2. 3. 4.

TRT TTRT THT AMT Correct Choice : 3






275 - Bridges can divide a large ________ into smaller segments 1. 2. 3. 4.

Network Packet Frame Address Correct Choice : 1


276 - Repeater is an amplifier, not a regenerator. 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 2


277 - Repeaters work on the ____Layer/Layers 1. 2. 3. 4.

Data Link Physical LLC None of the above Correct Choice : 2


278 - On the transport layer of TCP/IP suit_____ protocols are used 1. 2. 3. 4.

TCP & IP TCP & UDP IP TCp Correct Choice : 2


279 - A Repeater does not allow us to extend the physical length of network 1. 2. 3. 4.

TRUE FALSE

Correct Choice : 2


280 - Application layer of TCP/IP suit is equivalent of _____layers of OSI Model 1. 2.

Application, Presentation and Transport Application, Session and Transport

MCQS

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