Which of the following performs modulation and demodulation?

NETWORKING - TRANSMISSION MEDIA MCQ

• Which transmission media has the highest transmission speed in a network?
• Bits can be send over guided and unguided media as analog signal by
• Which data communication method is used to transmit the data over a serial communication link?
• The method of communication in which transaction takes place in both directions,but only in one direction at a time, is called ?
• In communication satellite, multiple repeaters are known as?
• Loss in signal power as light travels down the fiber is called?
• Which of the following devices modulates digital signals into analog signals that can be sent over traditional telephone lines?
• Which of the following performs modulation and demodulation?
• The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as
• Which of the following communication modes support two-way traffic but in only one direction at a time?
• Which of the following is considered a broadband communication channel?
• Which of the following is not a transmission medium?
• Which of the following is an advantage to using fiber optics data transmission?
• Which of the following communications lines is best suited to interactive processing applications?
• The loss in signal power as light travels down the fiber is called
• In _______ transmission, bits are transmitted simultaneously, each across its own wire
• In _______ transmission, bits are transmitted over a single wire, one at a time
• The copper wire is the example of
• Asynchronous Transfer Mode is ______________technology
• Which of the following to be considered as a broadband communication?
• What does UTP stands for?
• Transmission media are usually categorized as _______
• Transmission media lie below the _______ layer
• _______ cable consists of an inner copper core and a second conducting outer sheath
• In fiber optics, the signal is _______ waves
• Which of the following primarily uses guided media?
• Which of the following is not a guided medium?
• What is the major factor that makes coaxial cable less susceptible to noise than twisted-pair cable?
• In an optical fiber, the inner core is _______ the cladding
• The inner core of an optical fiber is _______ in composition
• When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, _______ occurs
• When the angle of incidence is _______ the critical angle, the light beam bends along the interface
• Signals with a frequency below 2 MHz use _______ propagation
• Signals with a frequency between 2 MHz and 30 MHz use ______ propagation
• Signals with a frequency above 30 MHz use _______propagation
• A parabolic dish antenna is a(n) _______ antenna
• A(n) _____ medium provides a physical conduit from one device to another
• _______ cable consists of two insulated copper wires twisted together
• ______ cable is used for voice and data communications
• __________ consists of a central conductor and a shield
• ____ cable can carry signals of higher frequency ranges than _____ cable
• _____ cables are composed of a glass or plastic inner core surrounded by cladding, all encased in an outside jacket
• _____ cables carry data signals in the form of light
• In a fiber-optic cable, the signal is propagated along the inner core by _______
• ________ media transport electromagnetic waves without the use of a physical conductor
• Radio waves are _________
• Microwaves are _________
• ______ are used for cellular phone, satellite, and wireless LAN communications
• _______ are used for short-range communications such as those between a PC and a peripheral device
• The meaning of Straight-through Cable is
• The amount of data that can be carried from one point to another in a given time period is called
• This is ordinary telephone twisted pair wire, one of several physical media specified in the IEEE 802.3 standard for Ethernet local area networks (LANs)
• In 10base2, 10base5, what does 2 and 5 stand for?
• The local loop has _______ cable that connects the subscriber telephone to the nearest end office
• Data from a computer are _______ the local loop handles _______ signals
• ______ is suitable for businesses that require comparable upstream and downstream data rates
• The largest portion of the bandwidth for ADSL carries _______
• _______ was designed as an alternative to the T-1 line
• HDSL encodes data using _______
• Another name for the cable TV office is the _______
• A traditional cable TV network transmits signals ______
• In an HFC network, the downstream data are modulated using the _______ modulation technique
• In an HFC network, the upstream data are modulated using the _______ modulation technique
• The standard for data transmission over an HFC network is called _______
• The original telephone network, which is referred to as the plain old telephone system (POTS), was an ________ system
• The modern telephone network is now ________
• The telephone network is made of ______ major components
• In ______signaling, the same circuit is used for both signaling and data
• In ________signaling, a portion of the bandwidth is used for signaling and another portion for data
• The protocol that is used for signaling in the telephone network is called ______
• Telephone companies provide two types of analog services: analog _______ services and analog _____services
• The two most common digital services are ________ service and ______
• The term modem is a composite word that refers to the two functional entities that make up the device: a signal _______ and a signal _______
• Most popular modems available are based on the ________standards
• _____technology is a set of technologies develpoed by the telephone companies to provide high data rate transmission
• The traditional cable TV system used ________cable end to end
• The second generation of cable networks is called a(n) _________ network
• The HFC network uses _______ cable
• To use a cable network for data transmission, we need two key devices: a ______ and a _________
• The B-channel is capable of carrying both
• A television broadcast is an example of ....................... transmission
• Multipath fading .................. the signal
• Which ISDN plane is associated with signaling another D channel?
• What is the max cable length of STP?
• What is the max data capacity of STP?
• Which connector STP uses?
• The loss in signal power as light travels down the fiber is called
• Avalanche photodiode receivers can detect bits of transmitted data by receiving
• Communication circuits that transmit data in both directions but not at the same time are operating in
• The interactive transmission of data within a time sharing system may be best suited to
• Which of the following is considered a broad band communication channel?
• Which of the following is not a transmission medium?
• is a measure of how much the strength of the signal is reduced in passing through a medium
• The receive equalizer reduces delay distortions using a
• In ................... transmission, the channel capacity is shared by both communicating devices at all times
• What are the most commonly used transmission speeds in BPS used in data communication?
• To connect a computer with a device in the same room, you might be likely to use
• Usually, it takes 10-bits to represent one character. How many characters can be transmitted at a speed of 1200 BPS?
• Avalanche photodiode receivers can detect hits of transmitted data by receiving
• Satellite-Switched Time-Division Multiple Access (SS/TDMA) is
• Carrier is
• A noiseless 3 KHz Channel transmits bits with binary level signals. What is the maximum data rate?
• The slowest transmission speeds are those of
• The receive equalizer reduces delay distortions using a
• If digital data rate of 9600 bps is encoded using 8-level phase shift keying (PSK) method, the modulation rate is
• Which of the following is a voice band channel?
• What are the data transmission channels available for carrying data from one location to another?
• What frequency range is used for FM radio transmission?
• If delays are recorded as 10 bit numbers in a 50 router network, and delay vectors are exchanged twice a second, how much bandwidth per fill duplex line is occupied by the distributed routing algorithm?
• Bandlimited signal is
• Identify the odd term amongst the following group:
• The signal to noise ratio for a voice grade line is 30.1 dB (decibels) or a power ratio of 1023:1. The maximum achievable data rate on this line whose spectrum ranges from 300 Hz to 4300 Hz is
• The encoding method specified in the EIA-232 standard is _____
• The transmission signal coding method of TI carrier is called
• In a PC to telephone hookup for long distance communication, modem is connected between the telephone line and
• Which of the following is considered a broadband communications channel?
• A decrease in magnitude of current, voltage, a power of a signal in transmission between points, is known as
• Data communications monitors available on the software market include
• Which of the following statement is correct?
• The data communication support should include, but is not restricted to
• Which of the following statement is correct?
• In a synchronous modem, the receive equalizer is known as
• After coding a document into a digital signal, it can be sent by telephone, telex or satellite to the receiver where the signal is decoded and an exact copy of the original document is made. What is it called?
• Which of the following data transmission media has the largest terrestrial range without the use of repeaters or other devices?
• The area of coverage of a satellite radio beam is known as
• In geosynchronous orbit, satellite
• What frequency range is used for microwave communications, satellite and radar?
• A 4 KHz noise less channel with one sample ever 125 per sec is used to transmit digital signals. If Delta modulation is selected, then how many bits per second are actually sent?
• A 6-MHz channel is used by a digital signaling system utilizing 4-level signals. What is the maximum possible transmission rate?
• Number of bits per symbol used in Baudot code is
• An example of digital, rather than analog, communication is
• A 4 KHz noise less channel with one sample ever 125 per sec is used to transmit digital signals. Differential PCM with 4 bit relative signal value is used. Then how many bits per second are actually sent?
• Baseband is
• Which of the following frequency ranges is used for AM radio transmission?
• Synchronous protocols
• Which of the following medium is used for broadband local networks?
• Phase shift keying (psk) method is used to modulate digital signals at 9600 bps using 16 levels. Find the line signaling speed (i.e., modulation rate)
• One important characteristic of the hub architecture of ARC-net is
• How much power (roughly) a light-emitting diode can couple into an optical fiber?
• A 2000-character text file has to be transmitted by using a 1,200 baud modem. Can you tell how long will it take?
• The channel in the data communication model can be
• The EIA-232 interface has _____ pins
• Which of the following signals is not standard RS - 232-C signal?
• A communications medium that uses pulses of laser light in glass fibers. Select the best fit for answer:
• Most data communications involving telegraph lines use:
• Telecommunications networks come in a wide range of speed and capacity capabilities. Select the best fit for answer:
• What frequency range is used for TV transmission and low power microwave applications?
• Which of the following statement is correct ?
• In communication satellite, multiple repeaters are known as
• We can receive data either through our television aerial or down our telephone lines and display this data on our television screen. What is the general name given to this process?
• The frequency range : 300 kHz to 3 MHz is used for
• Modulation in which the two binary values are represented by two different amplitudes of the carrier frequency is known as
• The core diameter of a single-mode fibers is about
• Which of the following is an example of bounded medium?
• Multilevel Amplitude Shift Keying (MASK) is not implemented with pure Amplitude Shift Keying (ASK), it is implemented with
• In a constellation diagram, a signal element type is represented as a
• The term that refers to the phase continues through the boundary of two signal elements is
• The example of an analog to analog conversion is
• The total bandwidth required for Amplitude Modulation (AM) is
• The total bandwidth required for AM can be determined from the bandwidth of the audio signal
• A constellation diagram can help us to define the signal\'s
• In Multilevel Frequency Shift Keying (MFSK), to send 3 bits at a time we can use
• In the case of Phase Modulation (PM), the value of beta (β) is
• Analog-to-analog conversion can be accomplished in
• The projection of the point on the X axis defines the peak amplitude of the
• Digital information in which the carrier signal is modified by one or more of its characteristics is called
• In BPSK, we use a polar Non Return to Zero (NRZ) signal for
• The Quadrature Amplitude Modulation (QAM) has the same advantages as
• In Binary Phase Shift Keying (BPSK), there are two values of phase i.e. 0 degree and
• The value of r in analog transmission is
• When Amplitude Shift Keying (ASK) is implemented using only two levels then it is called
• Find the bandwidth for the AM if we need to modulate a 5-KHz voice
• The Quadrature means
• The most efficient and commonly used digital to analog conversion mechanism is
• AM stations are allowed carrier frequencies anywhere between
• In analog-to-analog conversion, the terms that are usually categorized together is
• Information can be represented as a sequence of
• The parameter that refers to the recording and broadcasting of the picture is
• Both station can transmit and receive data simultaneously in
• In representation of text symbols, each set of the bit pattern is called
• Data communications are the transfer of data through some
• Keyboard and traditional monitors are examples of
• The term that is used for physical path by which a message travels from sender to receiver is
• In star topology if the central hub goes down, it effects
• Protocols are, set of rules to govern
• The parameter that refers to uneven delay of data packets in the delivery is
• The mode in which each station can send and receive data but not at the same time is called
• Maximum number of characters or symbols that can be represented by Unicode
• The word Tele means
• In mesh topology, the devices are connected via
• Performance, reliability and security are criteria of
• The effectiveness of a data communications system depends on four fundamental characteristics
• Hybrid network includes combination of
• Delivering data to the correct destination is
• Telephone is an example of
• An internet is a
• When the system delivers data accurately then it is called
• The mode that is like a two way street with traffic flowing in both direction simultaneously is
• The agreement between the communicating devices are called
• The five components that make up a data communications system are the message, sender, receiver, medium and
• Two computers connected by an Ethernet hub are of
• Tele is a word in
• The services of WorldCom, Sprint and Verizon are provided by
• The cable modem for data transmission, is similar to
• V.90 modems with a bit rate of 56,000 bps are called
• The Very high-bit-rate Digital Subscriber Line\'s (VDSAL) downstream rate is
• The type of signaling that have the same circuit and is used for both signaling and voice communication is called
• The Asymmetric DSL is used the line code of
• In data over cable system interface specification, the downstream communication has only one
• The coaxial cable has a bandwidth that ranges from
• When the Cable TV is used for data transfer then the downstream band has
• Communication is bidirectional in
• If a subscriber needs to provide free connections for other subscribers, it can request the
• The distance of the Symmetric Digital Subscriber Line (SDSL) is
• The cable modem transmission system receives data from the internet and passes them to the
• The protocol that is used in the signaling network is called
• Communication in the traditional cable TV network is
• The bandwidth of analog switched service in between
• MTP stands for
• The Asymmetric Digital Subscriber Line (ADSL), Very high-bit-rate Digital Subscriber Line (VDSL), High-bit-rate Digital Subscriber Line (HDSL) and Symmetric Digital Subscriber Line (SDSL) is referred to as
• DSL stands for
• Downstream data are modulated using the
• An Asymmetric Digital Subscriber Line (ADSL) is not suitable for
• ADSL is an asymmetric communication technology designed for
• The extra bit in modem is used for
• Cable TV networks started to distribute broadcast video signals to locations in the late
• Telephone networks use
• The High-bit-rate Digital Subscriber Line (HDSL) uses two twisted pairs to achieve
• The effective bandwidth of a telephone line being used for data transmission is
• The theoretical downstream data rate is
• The standard V92 can upload data at the rate of
• The channels can be shared in an area with many subscribers with the help of
• The transmission media that handle the communication between offices is called
• The V.34bis modem provides a bit rate of 28,800 with a
• The existing local loops with Asymmetric Digital Subscriber Line (ADSL) can handle bandwidths up to
• The theoretical upstream data rate in QPSK is
• In downstream sharing, if the address matches then the data are
• The maximum data rate of 64 kbps is of
• The tasks of data transfer and signaling are separated in modern
• The Asymmetric Digital Subscriber Line- Lite (ADSL Lite) uses carriers for
• The upstream data bandwidth is
• HFC stands for
• The downstream data occupies
• The minimum time required to download one million bytes of information for V32 modem would be
• The modulation technique that has become standard for Asymmetric Digital Subscriber Line (ADSL) is called the
• The High-bit-rate Digital Subscriber Line (HDSL) was designed as an alternative to
• Switched/56 service is the digital version of an
• In Discrete Multitone Technique (DMT), Channel 0 is reserved for
• The designers of ADSL have divided the available bandwidth in to
• The local loop has a bandwidth of
• A switch connects several local loops or trunks and allows a connection between different
• In Discrete Multitone Technique (DMT), Channel 1-5 is used for
• In Signaling System Seven (SS7), the transport layer of OSI model is equivalent to
• In OOOVBOVB, V stands for violation and B stands for
• A no periodic signal has changed to a periodic signal with the period equal to
• The average signal rate of 2BlQ is
• NRZ-L and NRZ-I both have an average signal rate of
• The last step in Pulse Code Modulation (PCM) is
• The relationship between data rate and signal rate depends on the value of
• HDB3 substitutes four consecutive zeros with OOOV or BOOV depending on the number of nonzero pulses after
• The minimum bandwidth of the digital signal is nb times greater than the bandwidth of the
• In which scheme all the signal levels are on one side of the time axis?
• Data encoding is not possible if
• The Nyquist sampling rate is
• How many communication channels are needed for serial transmission?
• The block coding scheme that provides greater error detection capability than 4B/5B is
• In synchronous transmission, we send bits one after the another without
• The bit rate for 1000 baud, FSK, baud rate would be
• A system is using NRZ-I to transfer 10-Mbps data. What would be minimum bandwidth
• What is the number of bits per baud for PSK with four different phases
• In Return to Zero (RZ), the signal changes not between bits but
• Line coding, block coding and scrambling are three techniques of
• The coding scheme that was designed to be used in combination with None Return to Zero- Invert (NRZ-I) is
• In real life, most digital signals have bandwidth
• The term that means data is sent over four wires at the same time is
• The transmission that is used without the timing signal is called
• The unit of the signal rate is
• The term that is used as an alternative to None Return to Zero (NRZ) is
• The value of the error for any sample is less than
• In asynchronous transmission, we send one start bit that is
• Line coding converts a sequence of
• Line coding, block coding and scrambling are the techniques of converting the
• The actual bandwidth of a digital signal is infinite, the effective band width would be
• The technique that is most common to change an analog signal to digital data is
• The 8BIlOB block coding is a combination of
• In 8B6T, the minimum bandwidth is very close to
• What would be the minimum bandwidth of Manchester and differential Manchester?
• The inverse of the sampling interval is called the
• A signal cannot be sampled with an
• In alternate mark inversion, mark means
• A telephone line cannot pass frequencies below
• A term that refers to a code that is generated to detect some or all of errors occurred during transmission is
• A sequence that creates the constant zero voltage does not have a
• In 8B6T, each signal pattern has a weight of 0 or
• For Pulse Code Modulation (PCM), the quantization error is much greater than
• Baud rate is the number of
• MLT-3 schemes uses three levels
• Block coding is normally referred to as mBlnB coding it replaces each m-bit group with an
• The change or lack of change in the level of the voltage determines the value of the bit is known as
• Which technique is always needed in digital to digital conversion
• The term that refers to as mBlnB coding, it replaces each m bit group with an n bit group is called
• Bipolar with S-Zero Substitution (BSZS) is commonly used in
• Baseline wandering is prevented by the
• The minimum bandwidth of Manchester and differential Manchester is
• The term that refers to the shortest unit and carries data elements is called
• The bandwidth is proportional to the
• Quadrature amplitude modulation is a combination of
• The transmission mode in which multiple bits are sent with each clock trick is
• Parallel transmission is good in speed but it is very
• Signal rate is also called the
• In bipolar encoding, we use three levels: positive, zero and
• In NRZ-I the inversion or the lack of inversion determines the
• The most common technique to change an analog signal to digital data is called
• Asynchronous, synchronous and isochronous are three subclasses of serial transmission to send
• If the delta is positive, the modulator process records
• B8ZS substitutes eight consecutive zeros with
• The idea of Return to Zero (RZ) and Non Return to Zero-Level (NRZ-L) are combined into the
• In the adaptive delta modulation, for better performance, the value of delta is
• Transmission media are directly controlled by the
• The electromagnetic waves ranging in frequencies between 3 kHz and 1 GHz are called
• The ray of light refracts and moves closer to the surface then the angle of the incidence is
• Guided media provides a conduit from one device to another, includes
• RG-59 is used in
• In telecommunications, transmission media can be divided into
• The twisted pair cable in which metal casing improves the penetration of noise or crosstalk is called
• Line-of-sight propagation lies above
• In single mode, the decrease in density results in a critical angle that is close enough to
• Optical fibers use reflection to guide light through a
• In the electromagnetic spectrum for wireless communication, the reserved range for Radio waves and microwaves is known as
• 7/125 is the fiber type used in propagation mode:
• The long-distance communication using electric signals was started with the invention of the telegraph by Morse in
• Super High frequency (SHF) is used in
• The range of middle frequency is
• Unguided medium is
• Radio waves are
• Unguided signals can travel from the source to destination in
• Microwaves having frequency between
• Propagation of light is
• The twisted pair cable consists of
• Infrared signals can be used for
• The electromagnetic spectrum is divided into 8 ranges called
• The cable that accepts and transports signals in the form of light is
• The Ultra High Frequency (UHF) is using the propagation method of
• Infrared waves, that can be used for short range communication have frequencies between
• How many modes are currently in used for propagating light along optical channels
• The term that is used to measure of the thickness of the wire is
• Microwaves are used for
• Fast Ethernet uses
• Shielded Screen Twisted pair decreases crosstalk effect and increases the data rate upto
• In line-or-sight propagation, very high-frequency signals are transmitted in straight lines directly from antenna to
• Infrared waves are used for
• The omnidirectional antennas send out signals in
• The radio waves, micro- waves and infrared waves are types of
• The term that refers to a strong material used in the fabrication of bulletproof vests is called
• Wireless communication started in
• In Coaxial Cable, the whole cable is protected by a
• The most common twisted-pair cable used in communications are
• The connector that is used for connecting cable to networking devices is called
• The most common unshielded twisted pair connector is
• A signal that is the result of a conversion of data from another form is known as
• The wireless transmission is divided into
• Omni directional waves are propagated in
• In multimode propagation, the term step index refers to the
• Unshielded Twisted-Pair cables are used in
• Unguided communication media is
• In computer, communication media includes
• Diameter of fiber optic cable is
• Transmission media which transmits voice and data through air as high frequency radio waves is
• Transmission media which can be used in LAN is
• Which of the following is not guided as computer communication media?
• Time taken by a computer data signal to reach to moon and then back to earth is about
• Important property of fiber optic cable is
• Which of the following is not a communication media?
• Transmission media which consists of thin glass to transmit beams of light is
• Cable which is comprised of two separate insulated copper wires that are twisted together is called
• Communication medium which requires line-of-sight is
• Microwaves transmission, coaxial cables and fiber optics are examples of
• Which of the following severally affects the quality of satellite transmission?
• Path through which computer data is transmitted from one place to another is called

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