Deck 10: Wireless Communications Systems

Question 1

__________ uses a frequency-hopping spread-spectrum format.
A.Bluetooth
B.Broadband wireless access
C.Unlicensed national information infrastructure
D.Multiple-input multiple-output

Answer 1

Bluetooth

Question 2

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

Answer 2

Cognitive

Question 3

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

Answer 3

repeaters

Question 4

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

Question 5

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

Question 6

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)

Question 7

The biggest advantages of wireless accessibility are user mobility and ______________.
A.maximum operating range
B.privacy
C.cost-effectiveness
D.data transmission

Question 8

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

Question 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.

Question 10

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

Question 11

The use of cryptography means that the information being transmitted over the air is _________.
A.classified
B.jammed
C.disrupted
D.encrypted

Question 12

What signaling format does WiMAX use?
A.MIMO
B.OFDM
C.DSP
D.IEEE

Question 13

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

Question 14

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

Question 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)

Question 16

_________ 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

Question 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

Question 18

_________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

Question 19

What percentage of the world's population counts themselves as wireless subscribers?
A.50%
B.95%
C.25%
D.70%

Question 20

What concept involves using a regular arrangement of transmitter-receiver systems?
A.Spreading code
B.Cellular
C.Communication security
D.Trunking

Question 21

What are assigned around licensed channels to minimize the possibility of interference?
A.Guard bands
B.Guarantees
C.Bug fixes
D.Basebands

Question 22

__________ often use cryptography to protect the transmitted data from eavesdropping.
A.Authentication
B.Countermeasures
C.Confidentiality
D.Integrity

Question 23

_______ is the time delay from the request for information until a response is obtained.
A.Transition protocol
B.Connection stability
C.Availability
D.Latency

Question 24

A(n)______ radio system to make maximal use of scarce radio spectrum.
A.software-defined
B.trunked
C.available
D.compliant

Question 25

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