Description : Which of the following communications lines is best suited to interactive processing applications? a. narrow band channel b. simplex lines c. full duplex lines d. mixed band channels
Last Answer : full duplex lines
Description : Which of the following types of channels moves data relatively slowly? A. widebandchannel B. voice band channel C. narrowband channel D. broadbandchannel E. None of the above
Last Answer : narrowband channel
Description : A remote batch-processing operation in which data is solely input to a central computer would require a. telegraphp line b. simplex lines c. mixed bad channel d. all of above
Last Answer : simplex lines
Description : A remote batch-processing operation in which datais solely input toa central computer would requirea: A. telegraphline B. simplex lines C. mixed-band channel D. All the above E. None of the above
Description : Carrier is A. One or more conductors that serve as a common connection for a related group of devices B. a continuous frequency capableof being modulated or impressed witha second signal C. ... that provides a data communications service among stations attached tothe network E. None of the above
Last Answer : a continuous frequency capableof being modulated or impressed witha second signa
Description : Contention is A. One or more conductors that serve as a common connection for a related group of devices B. a continuous frequency capableof being modulated or impressed witha second signal C. ... that provides a data communications service among stations attached tothe network E. None of the above
Last Answer : the condition whentwo or more stations attempt to use the same channel at the same time
Description : The interactive transmission of data within a time sharing system may be best suited to a. simplex lines b. half-duplex lines c. full duplex lines d. biflex-lines
Last Answer : half-duplex lines
Description : What are the datatransmission channels availablefor carrying datafrom one location to another? A. Narrowband B. Voice band C. Broadband D. All of theabove E. None of the above
Last Answer : All of theabove
Description : In _______ transmission, the channel capacity is shared byboth communicatingdevices at all times. A) simplex B) half-duplex C) full-duplex D) half-simplex
Last Answer : full-duplex
Description : State weather the following statement is true or false for Point-to-Point Protocol 1). It is still in widespread use for dial-up TCP/IP connections 2) Point-to-point circuits in the form of asynchronous lines have long been ... . false C. 1. false, 2. false, 3. false D. 1. true, 2. false, 3. true
Last Answer : D. 1. true, 2. false, 3. true
Description : An example of a medium speed, switched communications service is a. series 1000 b. data phone 50 c. DDD d. All of the above
Last Answer : DDD
Description : The channel in the data communication model can be a. postal mail services b. telephone lines c. radio lines d. any of the above
Last Answer : any of the above
Description : Communiction circuits that transmit data in both directions but not at the same time are operating in a. a simplex mode b. a half duplex mode c. a full duplex mode d. an asynchronous mode
Last Answer : a half duplex mode
Description : Which data communication method is used to transmit the data over a serial communication link? a. simplex b. half-duplex c. full-duplex d. b and c e. None of above
Description : Data flow between two devices canoccur in a _______ way. A) simplex B) half-duplex C) full-duplex D) all of theabove
Last Answer : all of theabove
Description : A transmission mode that can transmit data in both the directions but transmits in only one direction at a time. a) simplex b) half duplex c) full duplex d) semi-duplex
Last Answer : b) half duplex
Description : What is WISP? a) Wideband Internet Service Protocol b) Wireless Internet Service Provider c) Wireless Instantaneous Source Provider d) Wideband Internet Source Protocol
Last Answer : b) Wireless Internet Service Provider
Description : _____ is another method to solve a given LPP involving some artificial variable? a. Big M method b. Method of penalties c. Two-phase simplex method d. None of the above
Last Answer : a. Big M method
Description : MCI and AT&T are examples of whichof the following? A) Social networks B) Communications systems C) Internet service providers D) Mobisodes
Last Answer : Internet service providers
Description : An interfering current in a telegraph or signaling channel due to telegraph or signaling current by another channel. A. Crosstalk B. Noise current C. Crossfire D. Intermodulation
Last Answer : C. Crossfire
Description : Data communications monitors available on the software marked include a. ENVIRON/1 b. TOTAL c. BPL d. Telnet
Last Answer : ENVIRON/1
Description : ______ cable is used for voice and data communications. A) Coaxial B) Fiber-optic C) Twisted-pair D) none of the above
Last Answer : Twisted-pair
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 : The information tobe communicated ina data communications system is the_______. A) Medium B) Protocol C) Message D) Transmission
Last Answer : Message
Description : When data moves from one set of major connections to another on theInternet, we call theseconnections the Internet _____. A) Pathway B) Backbone C) Communications system D) Routers
Last Answer : Backbone
Description : The performance of data communications network depends on .............. A) Number of users B) The hardware and software C) The transmission D) All of the above
Last Answer : D) All of the above
Description : ……….cable is used for voice and data communications. a. Twisted-pair b. None of These c. Coaxial d. Fiber-optic
Last Answer : a. Twisted-pair
Description : Which of the following communication modes support two-way traffic but in only one direction at a time? a. simplex b. half duplex c. three-quarters duplex d. all of the above e. none of the above
Last Answer : half duplex
Description : A television broadcast is anexample of_______ transmission. A) simplex B) half-duplex C) full-duplex D) automatic
Last Answer : simplex
Description : Communication between acomputer and a keyboardinvolves______________ transmission. A) simplex B) half-duplex C) full-duplex D) automatic
Description : The communication modethat supports two-way traffic but only one direction at atime is A. simplex B. duplex C. half duplex D. multiplex E. None of the above
Description : Which of the communication modes support two way traffic but in only once direction of a time? A) Simplex B) Half-duplex C) Three - quarter's duplex D) Full duplex
Last Answer : B) Half-duplex
Description : Which mode of Communication occurs between a computer and a keyboard. a. Automatic b. Half-duplex c. Full-duplex d. Simplex
Last Answer : d. Simplex
Description : Which is not the legitimate transmission directions listed here? a. Simplex b. Half Duplex c. Full Duplex d. Double Duplex
Last Answer : d. Double Duplex
Description : The _______ is a unidirectional protocol that has no flow or error control. A. Simplest B. Simplex C. TCP/IP protocol D. Simplest or Simplex
Last Answer : D. Simplest or Simplex
Description : Three or more devices share a link in ________ connection. a) Unipoint b) Multipoint c) Point to point d) Simplex
Last Answer : b) Multipoint
Description : Telephone networks operate in this mode. a) simplex b) half duplex c) full duplex d) semi-duplex
Last Answer : c) full duplex
Description : A communication between a computer and a keyboard involves ____________ transmission. a) simplex b) half duplex c) full duplex d) semi-duplex
Last Answer : a) simplex
Description : Who did the is a series of dots and lines to represent numbers and letters using a telegraph?
Last Answer : Need answer
Description : When do you get "please enter area code" even after you dialed with the area code? See detail.
Last Answer : Who talks to operators any more? I didn’t think they existed.
Description : If your best friend dialed you by accident and you overheard him talking about you, would you hang up or listen?
Last Answer : I would listen and respond. If he were talking bad about me, I would assume that he would not want him as a friend in the future.
Description : Describe how dialed digits are transferred from a subscriber’s telephone tothe local exchange?
Last Answer : dbbrkm
Description : What is Narrowband ?
Last Answer : Narrowband : Narrowband is usually 45 to 300 bps . This band is used for slow data transmission. The use of this band is more noticeable in the case of telephony in general. In the case of telephony, the narrowband typically provides a frequency of 300 to 3400 Hz .
Description : Which antenna is not a wideband? A. Discone B. Folded dipole C. Helical D. Marconi
Last Answer : D. Marconi
Description : If the current ratios of the two or more elements must be held 5% and the phase angle to 3° the antenna is called a A. end fire array B. critical phased array C. broadband array D. wideband array
Last Answer : B. critical phased array
Description : What is the mixing process? A. Distortion caused by auroral propagation B. The combination of two signals to produce sum and difference frequencies. C. The elimination of noise in wideband receiver by phase differentiation D. The elimination of noise in a wideband receiver by phase comparison
Last Answer : B. The combination of two signals to produce sum and difference frequencies.
Description : To a conventional narrowband receiver, a spread spectrum signal appears to be
Last Answer : Noise
Description : The primary purpose of the data modem is to A. interface analog terminal equipment to analog communications channel B. interface digital terminal equipment to analog communications ... to digital communications channel D. interface digital terminal equipment to digital communications channel
Last Answer : B. interface digital terminal equipment to analog communications channel
Description : In mode, the communication channel is used in both directions at the same time? A) Full-duplex B) Simplex C) Half-duplex D) None of the above
Last Answer : Answer : A
Description : Operating method in which the transmission is made alternately in each direction of a telecommunication channel A. Semi-duplex operation B. Duplex operation C. Half-duplex operation D. Simplex operation
Last Answer : C. Half-duplex operation