MCQS

CS601

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Exam Term : Final Total MCQS : 287

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1 - First commercial modems are developed in

1. 19472. 19503. 19604. 1970 Correct Choice : 4 From Lectuer # 23

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2 - Traditional modem's uploading data rate is

1. 33.3kbps2. 33.5kbps3. 33.6kbps4. 56kbps Correct Choice : 3 From Lectuer # 23


3 - In traditional modem, maximum data rate in downloading direction is

1. 33.3kbps2. 33.5kbps3. 33.6kbps4. 56kbps Correct Choice : 4 From Lectuer # 23


4 - What is the major factor that makes coaxial cable less susceptible to noise thantwisted-pair cable?

1. Outer conductor2. Inner conductor3. Diameter of cable4. Insulating material Correct Choice : 1 From Lectuer # 24


5 - Transmission media are usually categorized as _____________

1. Fixed or Unfixed2. Guided or Unguided3. Determinate or Indeterminate4. Metallic or Nonmetallic Correct Choice : 2 From Lectuer # 24


6 - Radio wave and microwave frequencies range from _________.

1. 3 to 300 KHz2. 300 KHz to300 KHz to 3 GHz3. 3 KHz to 300 GHz4. 3 KHz to 3000 GHz

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Correct Choice : 3 From Lectuer # 24www.vugujranwala.com

7 - Classes of Transmission Media are _________

1. Electromagnetic Spectrum2. Coxial and Twisted Cable Media3. Guided and Unguided Media4. None of Given Correct Choice : 3 From Lectuer # 24


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

1. Coaxial2. Twisted-pair3. Fiber-optic4. Shielded twisted-pair Correct Choice : 1 From Lectuer # 24


9 - In fiber optics the signal source is ____________waves.

1. Light2. Radio3. Infrared4. Very Low frequency Correct Choice : 1 From Lectuer # 24


10 - In data link layer, communication requires at least ___________ devices workingtogether.



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

1. Infrared2. Telephone3. Fast Ethernet4. Traditional Ethernet Correct Choice : 2 From Lectuer # 24


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

1. EIA2. IrDA3. FCC

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4. PUD Correct Choice : 2 From Lectuer # 24


13 - BNC connectors are used by _______ cables

1. Fiber-optic2. UTP3. STP4. Coaxial Correct Choice : 4 From Lectuer # 24


14 - In CRC there is no error if the remainder at the receiver is _______.

1. Nonzero2. The quotient at the sender3. Equal to the remainder at the sender4. Zero Correct Choice : 4 From Lectuer # 24


15 - BW of the local loop telephone line is

1. 4kHz2. 4bps3. 33.6kHZ4. 56 kHZ Correct Choice : 1 From Lectuer # 24



17 - Metal cables use

1. Voice band frequency2. Radio frequency3. visible light4. both a and b Correct Choice : 1 From Lectuer # 24


18 - Electromagnetic signal can not travel through

1. Vavuum2. air3. Transmission media4. none of these Correct Choice : 4 From Lectuer # 24


19 - Classes of transmission media

1. 1

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2. 23. 34. 4 Correct Choice : 2 From Lectuer # 24


20 - Higher grades of STP cables are used in many LAN technologies including ethernetand token ring

1. TRUE2. FALSE3. 4. Correct Choice : 2 From Lectuer # 24


21 - Categories of UTP ccbles is



22 - In which categories, the next higher grade, suitable for voice and data transmission ofup to 4Mbps

1. Category 02. Category 13. Category 24. Category 3 Correct Choice : 3 From Lectuer # 24


23 - _______ is the propagation method subject to the greatest distortion.

1. Single-mode2. Multimode step-index3. Multimode graded-index4. Multimode single-index Correct Choice : 2 From Lectuer # 25


24 - The material of core and cladding in fiber optic cable is same.



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

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26 - STP can eliminate a phenomenon called Crosstalk



27 - In fiber optic cable, the signal source is__________ waves

1. Infrared2. Light3. Radio4. Very Low Frequency Correct Choice : 2 From Lectuer # 25


28 - The RG number gives us information about ________.

1. Twisted pairs2. Coaxial cables3. Optical fibers4. all of the given Correct Choice : 2 From Lectuer # 25


29 - Transmission media are usually categorized as _______.

1. Guided or unguided2. Fixed or unfixed3. Determinate or indeterminate4. Metallic or nonmetallic Correct Choice : 1 From Lectuer # 25


30 - The RG number gives us information about _______.

1. Optical fibers2. Twisted pairs3. Coaxial cables4. All the above Correct Choice : 3 From Lectuer # 25


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

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1. Copper2. Bimetallic3. Glass or plastic4. Liquid Correct Choice : 3 From Lectuer # 25


32 - When we talk about unguided media, usually we are referring to _______.

1. Metallic wires2. Nonmetallic wires3. The air4. None of the above Correct Choice : 3 From Lectuer # 25


33 - In an environment with many high-voltage devices, the best transmission mediumwould be _________.

1. Twisted-pair cable2. Coaxial cable3. The atmosphere4. Optical fiber Correct Choice : 4 From Lectuer # 25


34 - Optical fibers, unlike wire media, are highly resistant to _______.

1. High-frequency transmission2. Low-frequency transmission3. Refraction4. Electromagnetic interference Correct Choice : 4 From Lectuer # 25


35 - STP is more expensive than UTP but is less susceptible to noise



36 - Range of coaxial cable

1. 10kHZ to 100 kHz2. 100kHz to 500khz3. 100khz to 500MHz4. 500Mhz to 1GB Correct Choice : 3 From Lectuer # 25


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39 - Reflection occurs when

1. angle of incidence becomes less than critical angle2. angle of refraction becomes less than critical angle3. angle of refracted becomes greater than critical angle4. angle of incidence becomes greater than critical angle Correct Choice : 4 From Lectuer # 25




42 - Cable that connects the subscriber telephone to the nearest end office in a local loopis called _______

1. Twisted-pair cable2. Coaxial cable3. Fiber-optic cable4. Subscriber cable Correct Choice : 1 From Lectuer # 26


43 - Which of the following is not a guided medium?

1. Twisted Pair2. Fiber Optic Cable3. Coaxial Cable4. Atmosphere Correct Choice : 4 From Lectuer # 26


44 - In an environment with many high-voltage devices, the best transmission mediumwould be _________.

1. Atmosphere2. Coaxial Cable3. Twisted Pair4. Fiber Optic Cable Correct Choice : 1 From Lectuer # 26


45 - Troposhpheric Propagation is in two ways light of sight and broadcast.



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46 - Ionosphere is the layer of atmosphere above the troposhere but below space



47 - In ______________ method a signal can be directed in a straight from Antenna toantenna.

1. Line of sight2. Ground propagation3. Sky propagation4. Microwaves Correct Choice : 1 From Lectuer # 26


48 - ________ is a type of transmission impairment in which the signal loses strength dueto the resistance of the transmission medium.

1. Attenuation2. Distortion3. Noise4. Decibel Correct Choice : 1 From Lectuer # 26


49 - _________ can impair a signal.

1. Attenuation2. Distortion3. Noise4. All of the above Correct Choice : 1 From Lectuer # 26


50 - All of popular Fiber optic connectors are ___________ shaped.

1. Conical2. Barrel3. Circular4. Rectangular Correct Choice : 2 From Lectuer # 26


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

1. Attenuation2. Distortion

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3. Noise4. Decibel Correct Choice : 2 From Lectuer # 26


52 - ________ is a type of transmission impairment in which an outside source such ascrosstalk corrupts a signal.



53 - In asynchronous transmission, the gap time between bytes is _______.

1. Fixed2. A function of the data rate3. Variable4. Zero Correct Choice : 3 From Lectuer # 26


54 - Synchronous transmission does not have _______.

1. A start bit2. A stop bit3. Gaps between bytes4. All the above Correct Choice : 4 From Lectuer # 26


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

1. Refraction2. Reflection3. Incidence4. Criticism Correct Choice : 2 From Lectuer # 26


56 - Which of the following is not a guided medium?

1. Twisted-pair cable2. Fiber-optic cable3. Atmosphere4. Coaxial cable Correct Choice : 3 From Lectuer # 26


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

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1. A guided medium2. A refractive medium3. An unguided medium4. A small or large medium Correct Choice : 3 From Lectuer # 26


58 - Which of the following primarily uses guided media?

1. Cellular telephone system2. Satellite communications3. Local telephone system4. Radio broadcasting Correct Choice : 3 From Lectuer # 26


59 - Radio wave and microwave frequencies range from _______.

1. 3 to 300 KHz2. 300 KHz to 3 GHz3. 3 KHz to 300 GHz4. 3 KHz to 3000 GHz Correct Choice : 3 From Lectuer # 26


60 - When the angle of incidence is _______ the critical angle, the light beam bends alongthe interface.

1. More than2. Less than3. Equal to4. None of the above Correct Choice : 3 From Lectuer # 26


61 - Which one is not the function of data link layer?

1. Line discipline2. Flow control3. Error control4. Network control Correct Choice : 4 From Lectuer # 26


62 - In an optical fiber, the inner core is _______ the cladding.

1. Less dense than2. Denser than3. The same density as4. Another name for Correct Choice : 2 From Lectuer # 26


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

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to the resistance of the transmission medium.



64 - ________ is a type of transmission impairment in which the signal loses strength dueto the different propagation speeds of each frequency that makes up the signal.



65 - ________ is a type of transmission impairment in which an outside source such ascrosstalk corrupts a signal.



66 - _________ can impair a signal.

1. Attenuation2. Distortion3. Noise4. All of the above Correct Choice : 1 From Lectuer # 26


67 - In asynchronous transmission, the gap time between bytes is _______.

1. Fixed2. A function of the data rate3. Variable4. Zero Correct Choice : 3 From Lectuer # 26


68 - Synchronous transmission does not have _______.

1. A start bit2. A stop bit3. Gaps between bytes

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4. All the above Correct Choice : 4 From Lectuer # 26


69 - Diameter of the core are expressed in

1. cm2. micro3. meters4. microns Correct Choice : 4 From Lectuer # 26



71 - ILD provide

1. Unfocused light2. Unfocused light long distance3. Focused light lon distance4. Focused light small distance Correct Choice : 3 From Lectuer # 26







77 - Measures the relative strengths of two signals

1. Decibel2. Bandwidth3. Phase4. Wavelength Correct Choice : 1 From Lectuer # 27


78 - The VLF and LF bands use _______ propagation for communications.

1. Space2. Ground3. Sky4. Line of sight Correct Choice : 2 From Lectuer # 27


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

1. 4000 Hz

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2. 2000 Hz3. 2000 MHz4. 4000 MHz Correct Choice : 4 From Lectuer # 27


80 - A parabolic dish antenna is a(n) _______ antenna.

1. Omnidirectional2. Bidirectional3. Horn4. Unidirectional Correct Choice : 4 From Lectuer # 27




83 - HF use

1. Line of sight2. Ionospheric propagation3. Tronospheric propagation4. Broad cast Correct Choice : 2 From Lectuer # 27





87 - Each service area is divided into small ranges

1. packets2. Cellular teliphony3. MTSO4. cells Correct Choice : 4 From Lectuer # 27


88 - Each cell office is controlled by a switching office called

1. cells2. MTS3. cellular telephony4. Mobile telephone switching office Correct Choice : 4 From Lectuer # 27



90 - Negative dB means

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1. Impairment2. Distortion3. Attenuation4. amplification Correct Choice : 3 From Lectuer # 27


91 - Positive dB means

1. Impairment2. Distortion3. Attenuation4. amplification Correct Choice : 4 From Lectuer # 27


92 - Distortion occur in

1. Signal2. Sine wave signal3. Composite signal4. EM signal Correct Choice : 3 From Lectuer # 27


93 - When propagation speed is multiplied by propagation time, we get the ________.

1. throughput2. wavelength of the signal3. distortion factor4. distance a signal or bit has traveled Correct Choice : 4 From Lectuer # 28


94 - In fiber optics, the signal source is _______ waves.

1. Very low-frequency2. Light3. Radio4. Infrared Correct Choice : 2 From Lectuer # 28


95 - When propagation speed is multiplied by propagation time, we get the ________.

1. throughput2. wavelength of the signal3. distortion factor4. distance a signal or bit has traveled Correct Choice : 4 From Lectuer # 28



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97 - Due to random motion of electron

1. Thermal noise2. Induced noise3. Cross talk4. Spike Correct Choice : 1 From Lectuer # 28







103 - Data link protocols can be divided into ______________ sub-groups.

1. Two2. three3. four4. five Correct Choice : 1 From Lectuer # 29


104 - Data link protocols can be divided into ______________ sub-groups.

1. Two2. three3. four4. five Correct Choice : 1 From Lectuer # 29


105 - WDM stands for

1. Wave Division Multiplexing2. Wrong Division Multiplexing3. Well Division Multiplexing4. West Division Multiplexing Correct Choice : 1 From Lectuer # 29


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



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107 - Multiplexing is the set of techniques that allows simultaneous TX of multiple signalsacross a ___________ data link

1. Single2. Double3. Multi4. None of the given Correct Choice : 1 From Lectuer # 29


108 - There are ________ basic categories of multiplexing.



109 - WDM(wave division multiplexing) deals with

1. electric waves2. light waves3. both4. Correct Choice : 2 From Lectuer # 29


110 - Which one is not the function of data link layer?

1. Flow control2. Error control3. Network control4. Line discipline Correct Choice : 2 From Lectuer # 29


111 - Which of the following techniques takes data from one high speed line and breaks itinto portions?

1. Inverse subtraction2. Inverse addition3. Multiplexing4. Inverse multiplexing Correct Choice : 3 From Lectuer # 29


112 - Time slots are dynamically allotted in _______________TDM technique.

1. FDM2. Asynchronous3. WDM

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4. Synchronous Correct Choice : 4 From Lectuer # 29


113 - A prism can deflect the light depending upon the angle of ____________ and thefrequency.

1. Deviation2. Incident3. Refraction4. Reflection Correct Choice : 4 From Lectuer # 29



115 - Data convert parrallel to series form, is the example of

1. Multiplexing2. Demultiplexing3. FDM4. TDM Correct Choice : 1 From Lectuer # 29


116 - MUX allocates exactly the same time slot to each device at all device whether or notthe device has any thing to transmit



117 - Interleaving concept use in case of

1. FDM2. TDM3. WDM4. Synchronous Correct Choice : 2 From Lectuer # 29


118 - Prism can deflect the light depending upon the

1. Angle of refraction2. angle of incidence3. Critical angle4. both a and c Correct Choice : 2 From Lectuer # 29


119 - Inteleaving can done by

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1. Bits2. Bytes3. other data unit4. all of these Correct Choice : 4 From Lectuer # 29



121 - Which multiplexing technique shifts each signal to a different carrier frequency?

1. FDM2. Synchronous TDM3. Asynchronous TDM4. None of the Above Correct Choice : 4 From Lectuer # 30


122 - Multiplexing has long been used as an essential tool in ______.

1. Electronic industry2. Telephone industry3. Space science4. VLAN Correct Choice : 2 From Lectuer # 30


123 - Asynchronous TDM is efficient only when the size of the time slot is kept relatively________

1. Large2. Medium3. Zero4. Small Correct Choice : 2 From Lectuer # 30


124 - Telephone network is an example of a __________ network.

1. Packet-switched2. Circuit-switched3. Message-switched4. Tele-switched Correct Choice : 4 From Lectuer # 30



126 - Asynchronous means

1. flexible2. fixed3. Unstatistical

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4. both b and c Correct Choice : 1 From Lectuer # 30


127 - Need for addressing makes asynchronous TDM inefficient for bit or byte interleaving



128 - Asynchronous TDM is efficient only

1. when the size of the time slot is kept relativly large2. when the size of the timeslot is kept relativly small3. when the number of input are greater4. when the numberof input are smaller Correct Choice : 1 From Lectuer # 30


129 - Telephone system application of

1. Asynchronous TDM2. Synchronous TDM3. Multiplexing4. Inverse Multiplexing Correct Choice : 3 From Lectuer # 30




132 - Digital services are less sensitive than analog ones



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

1. DDS2. DS3. USD4. DSU Correct Choice : 4 From Lectuer # 31


134 - DDS provide Max. date rate of

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1. 56kbps2. 64kbps3. 33 kbps4. 168 kbps Correct Choice : 2 From Lectuer # 31


135 - DS is a hierarchy of

1. FDM2. TDM3. Analog signal4. Digital signal Correct Choice : 4 From Lectuer # 31


136 - Error control is both error _________ and error ___________

1. detection; correction2. detection; deletion3. detection; avoidance4. detection; forwarding Correct Choice : 1 From Lectuer # 32


137 - ______ Control refers to methods of error detection and correction?

1. Flow2. Error3. Transmission4. none of the above Correct Choice : 2 From Lectuer # 32


138 - T Lines are ___________ lines designed for digital data

1. Analog2. Digital3. Composite4. Telephone Correct Choice : 2 From Lectuer # 32


139 - Europeans use a version of T-lines called _________

1. F-lines2. E-lines3. D-lines4. S-lines Correct Choice : 2 From Lectuer # 32


140 - FTTC stands for _____________

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1. flexible to the curb2. fiber to the curb3. fiber to the cable4. fiber to the center Correct Choice : 2 From Lectuer # 32


141 - FTTC can be implemented in ______________.

1. Telephone system2. Cable System3. Telephone and Cable System4. Non of the above Correct Choice : 3 From Lectuer # 32


142 - FTTC stands for ___________

1. fiber to the center2. fiber to the cable3. fiber to the curb4. flexible to the curb Correct Choice : 3 From Lectuer # 32


143 - Which error detection method consists of a parity bit for each data unit as well as anentire data unit of parity bits?

1. Simple parity check2. Checksum3. Two-dimensional parity check4. CRC Correct Choice : 3 From Lectuer # 32



145 - Error detection and correction is implemented

1. Data link layer2. Transport layer3. network layer4. both a and b Correct Choice : 4 From Lectuer # 32


146 - Which error detection method consists of just one redundant bit per data unit?

1. Simple parity check2. Two-dimensional parity check3. CRC4. Checksum Correct Choice : 1 From Lectuer # 33

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

1. Simple parity check2. Two-dimensional parity check3. CRC4. All of the given Correct Choice : 1 From Lectuer # 33


148 - Which error detection method consists of just one redundant bit per data unit?

1. Two-dimensional parity check2. CRC3. Simple parity check4. Checksum Correct Choice : 3 From Lectuer # 33


149 - Burst error is easily corrected then single bit error.



150 - Which of the following best describes a single-bit error?

1. A single bit is inverted2. A single bit is inverted per transmission3. A single bit is inverted per data unit4. Any of the above Correct Choice : 3 From Lectuer # 33


151 - Which error detection method involves polynomials?

1. CRC2. Simple parity check3. Two-dimensional parity check4. Checksum Correct Choice : 1 From Lectuer # 33


152 - In cyclic redundancy checking, what is the CRC?

1. The remainder2. The divisor3. The quotient4. The dividend Correct Choice : 1 From Lectuer # 33

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153 - In CRC there is no error if the if the remainder at the receiver is

1. Equal to the Remainder of the sender2. Zero3. Non Zero4. The quotient at the sender Correct Choice : 2 From Lectuer # 33


154 - In cyclic redundancy checking, the divisor is _______ the CRC.

1. The same size as2. 1 bit more than3. 1 bit less than4. 2 bits more than Correct Choice : 2 From Lectuer # 33


155 - At the CRC checker, _______ means that the data unit is damaged.

1. A string of alternating 1s and 0s2. A nonzero remainder3. A string of 0s4. A string of 1s Correct Choice : 2 From Lectuer # 33


156 - If the ASCII character G is sent and the character D is received, what type of error isthis?

1. Single-bit2. Multiple-bit3. Burst4. Recoverable Correct Choice : 3 From Lectuer # 33


157 - If the ASCII character H is sent and the character I is received, what type of error isthis?

1. Burst2. Recoverable3. Single-bit4. Multiple-bit Correct Choice : 3 From Lectuer # 33


158 - If the data unit is 111111, the divisor 1010, and the remainder 110, what is thedividend at the receiver?

1. 1111110112. 1010110

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3. 1111111104. 110111111 Correct Choice : 3 From Lectuer # 33


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

1. 0s are2. 1s are3. The CRC remainder is4. The polynomial is Correct Choice : 3 From Lectuer # 33


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

1. A polynomial is2. A CRC remainder is3. 0s are4. 1s are Correct Choice : 3 From Lectuer # 33


161 - If the ASCII character G is sent and the character D is received, what type of error isthis?

1. Single-bit2. Multiple-bit3. Burst4. Recoverable Correct Choice : 3 From Lectuer # 33


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



163 - Given a 10-bit sequence 1010011110 and a divisor of 1011, CRC will be



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

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1. The CRC checker divides the received data by the predetermined divisor andaccepts the data if the quotient is zero2. The CRC checker divides the received data by the predetermined divisor andaccepts the data if the remainder is one3. The CRC checker divides the received data by the predetermined divisor andaccepts the data if the remainder is less than zero4. The CRC checker divides the received data by the predetermined divisor andaccepts the data if the remainder is zero Correct Choice : 4 From Lectuer # 33


165 - At the CRC checker, ________ means that the data unit is damaged.

1. A string of 0s2. A string of 1s3. A string of alternating 1s and 0s4. A nonzero remainder Correct Choice : 4 From Lectuer # 33


166 - Which error detection method involves the use of parity bits?

1. Simple parity check2. Two-dimensional parity check3. CRC4. (a) and (b) Correct Choice : 4 From Lectuer # 33


167 - If odd parity is used for ASCII error detection, the number of 0s per 8-bit symbol is_______.

1. Indeterminate2. 423. Even4. Odd Correct Choice : 4 From Lectuer # 33


168 - Which error detection method can detect a burst error?

1. The parity check2. Two-dimensional parity check3. CRC4. (b) and (c) Correct Choice : 4 From Lectuer # 33



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

1. Parallel TX

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2. Serial TX3. Packet4. Frame Correct Choice : 1 From Lectuer # 33


171 - Burst error mean

1. two or more bit sign the data unit have changed from 0 to 1 or from 1 to 02. Multiple bits are changed3. Does not necessarily mean that error occur in consecutive bit4. all of these Correct Choice : 4 From Lectuer # 33



173 - it can not detect errors if the total number of error is even

1. VRC2. LRC3. Redundancy4. both a and b Correct Choice : 1 From Lectuer # 33



175 - Which erroe dectetion method involves polynomials?



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

1. Simple parity check2. Two-dimensional parity check3. CRC4. All the above Correct Choice : 4 From Lectuer # 34




179 - The checksum of 0000 and 0000 is __________

1. 11112. 0

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3. 11104. 111 Correct Choice : 1 From Lectuer # 35


180 - Which error detection method uses ones complement arithmetic?

1. Simple parity check2. Two-Dimensional parity check3. CRC4. Checksum Correct Choice : 4 From Lectuer # 35





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

1. -02. +03. The complement of the checksum4. The complement of the data Correct Choice : 1 From Lectuer # 35



1. A single bit is inverted2. A single bit is inverted per data unit3. A single bit is inverted per transmission4. None of the given Correct Choice : 2 From Lectuer # 35



1. Simple parity check2. Checksum3. Two-dimensional parity check4. CRC Correct Choice : 2 From Lectuer # 35



1. A single bit is inverted.2. A single bit is inverted per transmission

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3. A single bit is inverted per data unit.4. Any of the above Correct Choice : 3 From Lectuer # 35


186 - The Hamming code is a method of _______.

1. Error detection2. Error correction3. Error encapsulation4. (a) and (b) Correct Choice : 4 From Lectuer # 35



188 - which option better explain the concept of checksum

1. one pattern remain elusive2. Detects most error involving on even number of bits3. Detects all error involving an odd number of bits4. all if these Correct Choice : 4 From Lectuer # 35


189 - if a bit inversion is balanced by an opposite bit inversion in the corresponding digitalof another segment

1. Error is dedected2. Error is Undedected3. Checksum error occur4. CRC error occur Correct Choice : 2 From Lectuer # 35


190 - Error correction can be done if

1. Receiver can ask sender for re TX2. Receiver can use an error detecting code which automatically correct certainerror3. Receiver can use an error correcting code4. both a and b Correct Choice : 4 From Lectuer # 35


191 - In data link layer, communication requires at least ___________ devices workingtogether


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192 - Data link control is composed of ____________ important functions.




194 - Coordination of half duplex TX is a part pf a procedure called

1. Line discipline2. Flow control3. Error control4. all of these Correct Choice : 1 From Lectuer # 36


195 - Amount of data that can be sent before the receiving acknowledgment



196 - Coordinates the link systems, which device can send and when, it can send?



197 - Line discipline function of data link layer oversea

1. The establishment of devices2. Sight of a particular device to transmit a given time3. full duplex4. botha and c Correct Choice : 2 From Lectuer # 36


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

1. POLLING2. SELECTING

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3. None SELECTING4. None Polling Correct Choice : 1 From Lectuer # 37


199 - ENQ/ACK stands for______________

1. Enquiry/ Acknowledgment2. Enque/ Acknowledgment3. Enquist/ Acknowledgment4. none of the given Correct Choice : 1 From Lectuer # 37


200 - Flow control is needed to prevent ____________

1. Bit errors2. Overflow of the sender buffer3. Overflow of the receiver buffer4. Collision between sender and receiver Correct Choice : 3 From Lectuer # 37


201 - For point-to-point configuration, addressing is needed



202 - For point-to-point configuration, addressing is needed



203 - A timer is set when ___________ is (are) sent out.

1. A data frame2. An ACK3. A NAK4. All of given Correct Choice : 2 From Lectuer # 37


204 - Flow Control is the responsibility of _________

1. Network Layer2. Transport Layer

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3. Data Link Layer4. Physical Layer Correct Choice : 3 From Lectuer # 37


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

1. 2.544 Mbps2. 1.544 Mbps3. 1.544 kbps4. 1.544 Gbps Correct Choice : 2 From Lectuer # 37


206 - if the primary wants to recive data, it asks the second arise of they have anything tosend called

1. Selecting2. Polling3. Half duplex4. Full duplex Correct Choice : 2 From Lectuer # 37


207 - if the primary want to send data, it tells the largest, secondary to get ready to receivecalled

1. Selecting2. Polling3. Half duplex4. Full duplex Correct Choice : 1 From Lectuer # 37


208 - For stop-and-wait ARQ, for n data packets sent, ___________ acknowledgments areneeded.

1. n2. 2n3. N-14. N+1 Correct Choice : 1 From Lectuer # 38


209 - In the _____ Protocol, the sender sends one frame, stops until it receivesconfirmation from the receiver, and then sends the next frame?

1. Stop-and-Wait2. Simplest3. Go-Back-N ARQ4. Selective-Repeat ARQ Correct Choice : 1 From Lectuer # 38


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210 - Flow control is needed to prevent ____________.

1. Collision between sender and receiver2. Overflow of the receiver buffer3. Overflow of the sender buffer4. Bit errors Correct Choice : 2 From Lectuer # 38


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

1. 02. N-13. N4. N+1 Correct Choice : 2 From Lectuer # 38


212 - ARQ stands for ___________

1. Automatic repeat quantization2. Automatic repeat request3. Automatic retransmission request4. Acknowledge repeat request. Correct Choice : 2 From Lectuer # 38


213 - In __________ ARQ, if a NAK is received, only the specific damaged or lost frame isretransmitted.

1. Stop and Wait2. Go-Back-N3. Selective repeat4. Stop-and-wait & Go-back-N Correct Choice : 3 From Lectuer # 38




216 - In sliding window, frames are numbered module n mean from 0 to

1. n2. n - 13. n+ 14. 2n Correct Choice : 2 From Lectuer # 38



218 - Frame can be lost in tranmit if

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1. Lost data frame2. lost ACK frame3. Lost NAK frame4. all of these Correct Choice : 4 From Lectuer # 38


219 - XMODEM is a ______________ protocol designed for telephone-line communicationb/w PCs.

1. File transfer2. hardware3. software4. application exchange Correct Choice : 1 From Lectuer # 39


220 - Sliding window requires that data frames be transmitted _______________

1. Sequentially2. Frequently3. Synchronously4. Asynchronously Correct Choice : 1 From Lectuer # 39


221 - In __________ ARQ, if a NAK is received, only the specific damaged or lost frame isretransmitted.

1. Stop-and-wait2. Go-Back-N3. Selective reject4. Stop-and-wait & Go-back-N Correct Choice : 3 From Lectuer # 39



223 - In synchronous protocols

1. Treat each char ina a bit stream dependently2. Treat each char ina a bit stream independently3. traet the whole bit stream and chop it into char of equal size4. both b and c Correct Choice : 3 From Lectuer # 39



225 - Control frames from the receiver

1. ACK2. NAK

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3. CAN4. all of these Correct Choice : 4 From Lectuer # 39


226 - In X Modem

1. One CANs to abort transmission2. Two CANs to abort transmission3. Multiple files can be sent simultaneously4. both b and c Correct Choice : 1 From Lectuer # 39


227 - BLAST stands for :

1. Blocked synchronous transmission2. Barrel asynchronous transmission3. Below asynchronous transmission4. Blocked asynchronous transmission Correct Choice : 4 From Lectuer # 40


228 - Which of the following combines features of the other two.

1. ZMODEM2. YMODEM3. XMODEM4. None of given Correct Choice : 1 From Lectuer # 40


229 - The HDLC ___________ field defines the beginning and end of a frame.

1. Flag2. Address3. Control4. FCS Correct Choice : 1 From Lectuer # 40


230 - The shortest frame in HDLC protocol is usually the _________ frame.

1. Supervisory2. Management3. Information4. None of the given Correct Choice : 1 From Lectuer # 40


231 - In Y Modem

1. Multiple files can be sent simultaneously2. Two CANs to abort transmission

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3. ITU-T CRC 16 for error checking4. all of these Correct Choice : 4 From Lectuer # 40


232 - Protocols interpret a transmission frame or packet are succession of characters eachusually compared of one byte

1. Byte Criented protocols2. Bit oriented protocol3. BSC4. both a nd b Correct Choice : 1 From Lectuer # 40


233 - BSC developed by IB in



234 - BSc is

1. Usable in point to point2. Usable in multiple communication3. Half duplex4. all of these Correct Choice : 4 From Lectuer # 40


235 - if a fram is used stricly for control purpose called

1. Data purpose2. Data control purpose3. Control purpose4. bsc frame control Correct Choice : 3 From Lectuer # 40



237 - multi block frame

1. increase the likelihood of error detection2. text in a message is often divided b/w several block3. Several frames can carry continuation of single message4. all of these Correct Choice : 4 From Lectuer # 40



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239 - Shortest frame in HDLC protocols is usually the ____ frame.

1. Information2. Supervisory3. Management4. None of the above Correct Choice : 4 From Lectuer # 41



241 - Characterestic of HDLC is

1. Full duplex2. Point to pint3. Configaration4. all of these Correct Choice : 3 From Lectuer # 41







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




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



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

1. Network2. MAC

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3. LLC4. None of the above Correct Choice : 2 From Lectuer # 42










259 - A device listens to the line before it transmit

1. Multiple Access2. Carrier Sense3. Collision Setection4. all of these Correct Choice : 2 From Lectuer # 42



261 - Ethernet LAN can support data rates between

1. 1 to 100 kbps2. 1 to 100 Mbps3. 100 to 1000kbps4. 100 to 1000Mbps Correct Choice : 2 From Lectuer # 42



263 - In 10 base 2

1. No AUI cables are needed2. RG 83. BNC4. all of these Correct Choice : 1 From Lectuer # 43



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

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1. 100 base FX2. 100 base TX3. 10 base T4. 10 base T4 Correct Choice : 3 From Lectuer # 43


266 - In FDDI, THT stands for:

1. Token Hash Timer2. Tier Holding Timer3. Target Holding Timer4. Token Holding Timer Correct Choice : 4 From Lectuer # 44


267 - Acces control of token ring

1. Priority2. reservation3. time limits4. all of these Correct Choice : 4 From Lectuer # 44


268 - FDDI standardized by

1. ANSI2. ITU-T3. IEEE4. both a and b Correct Choice : 4 From Lectuer # 44


269 - In FDDI timers, which timers incrementing

1. THT2. TRT3. TTRT4. AMT Correct Choice : 2 From Lectuer # 44


270 - In FDDI timers, which timers decrementing

1. TRT2. TTRT3. THT4. AMT Correct Choice : 3 From Lectuer # 44



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275 - Bridges can divide a large ________ into smaller segments

1. Network2. Packet3. Frame4. Address Correct Choice : 1 From Lectuer # 45


276 - Repeater is an amplifier, not a regenerator.



277 - Repeaters work on the ____Layer/Layers

1. Data Link2. Physical3. LLC4. None of the above Correct Choice : 2 From Lectuer # 45


278 - On the transport layer of TCP/IP suit_____ protocols are used

1. TCP & IP2. TCP & UDP3. IP4. TCp Correct Choice : 2 From Lectuer # 45


279 - A Repeater does not allow us to extend the physical length of network



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

1. Application, Presentation and Transport2. Application, Session and Transport

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3. Application, Presentation and Session4. None of the above Correct Choice : 3 From Lectuer # 45


281 - Bridge is _____ Layer Device

1. Data Link2. Physical3. Network4. None of the above Correct Choice : 1 From Lectuer # 45







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