Description : The _________ product defines the number ofbits that can fill the link. A) bandwidth-period B) frequency-amplitude C) bandwidth-delay D) delay-amplitude
Last Answer : bandwidth-delay
Description : The _____of a composite signal is the difference between the highest and the lowest frequencies contained in that signal. A) frequency B) period C) bandwidth D) amplitude
Last Answer : frequency
Description : Which one of the following statements is FALSE? a. Packet switching leads to better utilization of bandwidth resources than circuit switching. b. Packet switching results in less variation ... than circuit switching d. Packet switching can lead to reordering unlike in circuit switching
Last Answer : Packet switching results in less variation in delay than circuit switching.
Description : Mobile Commerce is best described as– (A) The useof Kiosks in marketing (B) Transporting products (C) Buyingand selling goods/services through wirelesshandhelddevices (D) Using notebook PC's in marketing (E) None of the above
Last Answer : Buyingand selling goods/services through wirelesshandhelddevices
Description : A devicethat connects toa network without the useof cables is said to be– (A) distributed (B) free (C) centralized (D) open source (E) None of these
Last Answer : free
Description : A virtual local areanetwork (VLAN) is configured by _________. A) software B) physical wiring C) hardware D) none of the abov
Last Answer : software
Description : ___ cable can carry signals ofhigher frequency ranges than_____ cable. A) Twisted-pair; fiber-optic B) Coaxial; fiber-optic C) Coaxial; twisted-pair D) none of the abov
Last Answer : Coaxial; twisted-pair
Description : A(n)_________ signal is a composite analogsignal with an infinite bandwidth. A) digital B) analog C) either (a)or (b) D) neither (a) nor (b
Last Answer : digital
Description : In computer networks _________ is a characteristic that a flow needs where Lack of it means losing a packet or acknowledgment, which entails retransmission. A. Reliability B. Delay C. Jitter D. Bandwidth
Last Answer : A. Reliability
Description : Aship-to-ship communicationssystemisplagued byfading.The bestsolutionseemstobe useof a. a more directional antenna b. a broadband antenna c. frequency diversity d. space diversity
Last Answer : c. frequency diversity
Description : Variation in amplitude or frequency of carrier wave is called A. amplitude modulation B. frequency modulation C. modulation D. bandwidth
Last Answer : modulation
Description : In________, the available bandwidth is divided into frequency bands. A) FDMA B) TDMA C) CDMA D) none of the above
Last Answer : TDMA
Description : If the frequency spectrum of a signal has a bandwidth of500 Hz with thehighest frequency at 600 Hz, what shouldbe the samplingrate, according to the Nyquist theorem? A) 200 samples/s B) 500 samples/s C) 1000 samples/s D) 1200 samples/s
Last Answer : 1200 samples/s
Description : If the bandwidth of a signal is 5 KHz and thelowest frequency is 52 KHz, what is the highest frequency? A) 5 KHz B) 10 KHz C) 47 KHz D) 57 KHz
Last Answer : 57 KHz
Description : In_______, the peakamplitude of one signal level is 0; the other is thesame as the amplitude of the carrier frequency. A) PSK B) OOK C) FSK D) none of the above
Last Answer : OOK
Description : In_____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude)of the modulating signal. The peak amplitude and phase of the carrier signal remainconstant,but as ... of thecarrier changes correspondingly. A) AM B) PM C) FM D) none of the above
Last Answer : FM
Description : In________, the phase of thecarrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant. A) ASK B) PSK C) FSK D) QAM
Last Answer : PSK
Description : In________, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remainconstant. A) ASK B) PSK C) FSK D) QAM
Last Answer : ASK
Description : _______ describes the position of the waveform relative to time 0. A) Frequency B) Phase C) Amplitude D) Voltage
Last Answer : Phase
Description : _______is the rateof change with respect totime. A) Amplitude B) Time C) Frequency D) Voltage
Last Answer : Time
Description : In a time-domain plot, the horizontal axis is a measure of ________. A) signal amplitude B) frequency C) phase D) time
Last Answer : time
Description : In a frequency-domain plot, thehorizontal axis measures the________. A) peak amplitude B) frequency C) phase D) slope
Description : Bits can be sent over guided and unguided media as analog signal by ___________ a. digital modulation b. amplitude modulation c. frequency modulation d. phase modulation
Last Answer : a. digital modulation
Description : The absolute value of a signal's highest intensity is called………. A. Peak Amplitude B. Frequency C. Phase D. Both a and c
Last Answer : A. Peak Amplitude
Description : Modulation means A. Varying of information B. Utilization of a single transmission channel to carry multiple signals C. Varying of some parameters of a carrier such as its amplitude to transmit information D. Transmit pulses in DC form on a copper wire
Last Answer : C. Varying of some parameters of a carrier such as its amplitude to transmit information
Description : The objective of energy management is ____ A. To achieve and maintain optimum energy procurement and utilization throughout the organization B. To minimize the energy cost without affecting production and quality C. To minimize the environmental effects D. All of the above
Last Answer : All of the above
Description : Floppy disks typically in diameter a. 3‛ b. 5.25‛ c. 8‛ d. All of abov
Last Answer : All of abov
Description : The maximum frame length for 10-Mbps Ethernet is ________ bytes. A) 1518 B) 1500 C) 1200 D) none of the abov
Last Answer : 1518
Description : A bridge can use the _________algorithm tocreate aloopless topology. A) binary tree B) spanning tree C) multiway tree D) none of the abov
Last Answer : spanning tree
Description : In_________ transmission, we send bits oneafter another without startor stop bits or gaps. It is the responsibilityof the receiver togroup the bits. A) synchronous B) asynchronous C) isochronous D) none of the abov
Last Answer : synchronous
Description : ______ finds the value of thesignal amplitudefor eachsample; ____ finds the change from the previous sample. A) DM; PCM B) PCM; DM C) DM; CM D) none of the abov
Last Answer : PCM; DM
Description : The most common technique to change an analog signal to digitaldata is called __________. A) PAL B) PCM C) sampling D) none of the abov
Last Answer : PCM
Description : In IPv6,a ______address is used ifa site with several networks uses the Internetprotocols but is not connectedto the Internet for security reasons. A) link local B) site local C) mapped D) none of the abov
Last Answer : site local
Description : In IPv6,options are inserted between the _________and the ___________ data. A) baseheader;extensionheader B) baseheader;upper-layer data C) base header; frame header D) noneof the abov
Last Answer : baseheader;upper-layer data
Description : In SQL, which command(s) is(are) used to change atable's storage characteristics? A. ALTER TABLE B. MODIFY TABLE C. CHANGE TABLE D. All of theabove E. None of the abov
Last Answer : ALTER TABLE
Description : _____defines how a particular pattern to be interpreted,and whataction is tobe taken based on that interpretation. A) Semantics B) Syntax C) Timing D) None of the abov
Last Answer : Semantics
Description : Which field of cookie in WWW represents the server's directory structure by identifying the utilization of part associated with server's file tree? a. Domain b. Path c. Content d. Secure
Last Answer : b. Path
Description : The distance between two stations M and N is L kilometers. All frames are K bits long. The propagation delay per kilometer is t seconds. Let R bits/second be the channel capacity. Assuming that processing ... maximum utilization, when the sliding window protocol used is: a. A b. B c. C d. D
Last Answer : c. C
Description : For pure ALOHA, the maximum channel utilization is a. 100% b. 50% c. 36% d. 18%
Last Answer : d. 18%
Description : The number of cycles per unit time is called _________ A. Period B. Frequency C. Amplitude D. Wavelength
Last Answer : B. Frequency
Description : White smoke coming out of the chimney of a furnace indicates the useof (A) Low excess air (B) Very high excess air (C) Gaseous fuel in the furnace (D) Liquid fuel in the furnace
Last Answer : (B) Very high excess air
Description : A _________ sine wave is not useful in data communications; we need to send a _______signal. A) composite; single-frequency B) single-frequency; composite C) single-frequency;double-frequency D) none of the above
Last Answer : single-frequency; composite
Description : Which of the following does not affect the resolution of a video display image? a. Bandwidth b. Raster scan rage c. Vertical and horizontal lines of resolution d. Screen size
Last Answer : Screen size
Description : The synchronous modems are more costly than the asynchronous modems because a. they produce large volume of data b. they contain clock recovery circuits c. they transmit the data with stop and start bits d. they operate with a larger bandwidth e. none of above
Last Answer : they contain clock recovery circuits
Description : What is the term used todescribethe amount of space you have to transmit to and from the Internet? A) Internet speed B) Network speed C) Router D) Bandwidth
Last Answer : Bandwidth
Description : The largest portionof the bandwidth for ADSLcarries_______. A) voice communication B) upstream data C) downstream data D) control data
Last Answer : downstream data
Description : In ________, we combine signals from different sources to fit into a larger bandwidth. A) spread spectrum B) line coding C) block coding D) none of the above
Last Answer : spread spectrum
Description : ______ can be applied whenthe bandwidth of a link (in hertz) is greater than the combined bandwidths of the signals to be transmitted. A) TDM B) FDM C) Both (a)or (b) D) Neither (a) or (b)
Last Answer : FDM
Description : The minimum bandwidth of Manchester and differential Manchester is ____that of NRZ. A) the sameas B) twice C) thrice D) none of the above
Last Answer : twice
Description : What is the bandwidth ofa signal that ranges from 1 MHz to4 MHz? A) 4 MHz B) 1 KHz C) 3 MHz D) none of the above
Last Answer : 3 MHz