Quiz 10: Wireless Communications Systems
Chemistry
Q 1Q 1
The biggest advantages of wireless accessibility are user mobility and ______________.
A.maximum operating range
B.privacy
C.cost-effectiveness
D.data transmission
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cost-effectiveness
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OFDM
Q 3Q 3
__________ uses a frequency-hopping spread-spectrum format.
A.Bluetooth
B.Broadband wireless access
C.Unlicensed national information infrastructure
D.Multiple-input multiple-output
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Bluetooth
Q 4Q 4
What standards were developed to address key delivery problems with wireless data networks?
A.Broadband wireless access (BWA)
B.Data encryption standard (DES)
C.Global System for Mobile Communications (GSM)
D.Wireless application protocol (WAP)
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Q 5Q 5
There are five aspects to consider when securing a communication link. Which of the following aspects means that you can rely on the data getting through the communication channel without modification?
A.Authentication
B.Integrity
C.Nonrepudiation
D.Confidentiality
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Q 6Q 6
A "bad guy" is listening and picking up what information can be obtained from your wireless network. What type of computer attack is this considered?
A.Passive
B.External
C.Active
D.Internal
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Q 7Q 7
The use of cryptography means that the information being transmitted over the air is _________.
A.classified
B.jammed
C.disrupted
D.encrypted
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Q 8Q 8
Which of the following professions would most likely use a specialized land-mobile radio (SMR)?
A.Computer programmer
B.Emergency response personnel
C.Cyber security personnel
D.Radio broadcaster
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Q 9Q 9
What is a distinguishing feature of ZigBee?
A.It can be used in a number of network topologies.
B.It provides flexible channel sizes.
C.It is less susceptible to signal blockage.
D.It optimizes link quality.
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Q 10Q 10
_________is the reflection of radio waves striking the RFID tag and reflecting stored unique identification information back to the transmitter source.
A.Piconet
B.Frequency reuse
C.Slotted aloha
D.Backscatter
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Q 11Q 11
What concept involves using a regular arrangement of transmitter-receiver systems?
A.Spreading code
B.Cellular
C.Communication security
D.Trunking
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Q 12Q 12
What percentage of the world's population counts themselves as wireless subscribers?
A.50%
B.95%
C.25%
D.70%
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Q 13Q 13
What type of radio provides the promise that licensed and unlicensed services can coexist in the same spectrum?
A.Cognitive
B.Two-way
C.Adaptable
D.Portable
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Q 14Q 14
Both analog and digital land-mobile systems depend on __________ to provide wide-area coverage.
A.software-based signal-processing
B.repeaters
C.ADC converters
D.local oscillators
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Q 15Q 15
Which of the following is composed of bands of frequencies set aside by the Federal Communications Commission (FCC)to support short-range,high-speed,wireless data communications?
A.Unlicensed national information infrastructure (U-NII)
B.Wireless local-area networks (WLANs)
C.Wireless application protocol (WAP)
D.Radio frequency identification (RFID)
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Q 16Q 16
A _________ is an ad-hoc network of up to eight Bluetooth devices,such as a computer,mouse,headset,or earpiece.
A.backscatter
B.mesh
C.topology
D.piconet
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Q 17Q 17
What is the basis of RFID tag classification?
A.How they obtain their operating power
B.Their overall power consumption
C.Their intended application
D.How they store information
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Q 18Q 18
_________ involves the use of directional antennas to focus energy in preferred directions at the expense of others.
A.Channel setting
B.Space-division multiplexing
C.Sectorization
D.Cell splitting
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Q 19Q 19
What causes Rayleigh fading,particularly in urban areas?
A.Receiver picks up transmitted signal from multiple paths
B.Issue of limited read distance
C.Equipment failure or unfavorable path conditions
D.Maximum range achievable varies inversely with frequency and data rate
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Q 20Q 20
What is the purpose of the vocoder?
A.To compress voice data for transmission
B.To expand voice data for transmission
C.To provide voicemail services
D.To double the voice handling capacity
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Q 21Q 21
_______ is the time delay from the request for information until a response is obtained.
A.Transition protocol
B.Connection stability
C.Availability
D.Latency
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Q 22Q 22
Which of the following is the secret code used in the encryption algorithm to create cipher text and to decode (decrypt)the message?
A.Sequence
B.Signal
C.Key
D.Link
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Q 23Q 23
A(n)______ radio system to make maximal use of scarce radio spectrum.
A.software-defined
B.trunked
C.available
D.compliant
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Q 24Q 24
What are assigned around licensed channels to minimize the possibility of interference?
A.Guard bands
B.Guarantees
C.Bug fixes
D.Basebands
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Q 25Q 25
__________ often use cryptography to protect the transmitted data from eavesdropping.
A.Authentication
B.Countermeasures
C.Confidentiality
D.Integrity
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