Wireless Communications: An Introduction
Chapter 1 – Introduction to Wireless Communications
True/False Questions
1. VoIP phones can carry analog data over the Internet. False
2. WirelessHD can transfer video and sound at 7 Gbps and higher. True
3. UWB WiGig has a range of up to 100 meters. False
4. The ZigBee Alliance protocols enable devices like light switches to communicate with one another. True
5. RFID technology is implemented by roadside assistance services to link a vehicle and driver to a central service center. False
6. 4G technology uses 100% analog transmission for voice and data. False
7. An AP connects wireless devices to the wired LAN. True
8. DSL is an Internet access technology that uses cable TV lines to make a network connection. False
9. The job market for wireless LAN professionals is saturated and likely to decline in coming years. False
10. One advantage of wireless technology is that it is immune to interference sources. False
Multiple Choice Questions
1. What type of device is built into a tablet computer and can send data over radio waves to another device such as a laser printer? B
2. How can VoIP over Wi-Fi help save money? B
3. Where would you most likely find RFID tags around the house? A
4. What is the typical range for the use of Bluetooth? C
5. With what technology will you find radio modules and link managers?
6. Which technology has a maximum range of about 10 meters, can transmit up to 10 Gbps, and is used to transmit high quality audio and video wirelessly? C
7. Automatic connections between what type of devices create a piconet? C
8. In what type of wireless communication device will you find a repeater? A
9. What kind of network is built around the concept of low-power transmitters built on towers that can use the same radio frequency channel? B
10. What type of cellular network uses 100 percent digital transmission for voice and data and can reach rates up to 150 Mbps? B
11. What kind of device does a WLAN use to facilitate communication between wireless computers? C
12. Which wireless standard provides for data transmission speeds up to 600 Mbps with a range up to 375 feet? D
13. Which technology uses regular phone lines and transmits at speeds up to 256 Kbps? B
14. Which communication technology should you use if you need to connect three offices which are all within 3 miles of each other at speeds up to 75 Mbps using antennas? C
15. Where are you most likely to find the WAP2 protocol in use? A
16. What term refers to the combining of voice, video and text-processing and access to multiple network platforms from a single device? C
Matching
1. a wireless standard that enables devices to transmit data at up to 721.2 Kbps over a typical maximum distance of 33 feet. B
2. a variation of the Java programming language designed for use in portable devices such as cellular phones. D
3. a very small network that typically extends to 10 meters or less. J
4. a technology used to transmit data over special telephone lines at 1.544 Mbps. G
5. an alliance of companies involved in developing a common wireless specification using the 60 GHz band. I
6. a technology used to transmit data over a telephone line. C
7. remote sensors used for collecting data from manufacturing equipment or for scientific research. F
8. wireless communications technology that allows devices to transmit data at hundreds of megabits or even gigabits per second at short distances. H
9. a digital cellular technology that can send data at up to 21 Mbps over the cellular telephone network. A
10. special software in Bluetooth devices that helps identify other Bluetooth devices. E
True/False Questions 2
1. The ASCII code uses 16 bits to represent 128 different characters. False
2. Infrared light interferes with radio signals but is not affected by radio signals. False
3. The height of a radio wave is called the amplitude of the wave. True
4. Spread-spectrum signals are more susceptible to outside interference than narrow-band transmissions. False
5. Hopping codes used in FHSS transmissions are configured on the base station by the network administrator. False
Multiple Choice Questions 2
1. Which of the following is true about wireless radio signal transmissions? A
2. Which of the following is NOT true about infrared light? D
3. Which of the following transmits a signal in an infrared device? B
4. Which of the following is NOT a limitation of using infrared wireless systems? C
5. Which of the following is a good application for an infrared wireless system? D
6. Which best describes an analog signal? B
7. What process must occur to transmit a digital signal over an analog medium? A
8. The distance between a point in one wave cycle and the same point in the next wave cycle is called which of the following? B
9. The frequency of a wave is best defined as which of the following? D
10. What is the unit of measurement for radio frequency? C
11. What is the role of an antenna on a wireless device? D
12. Which of the following is true about baud rate? B
13. Which of the following best describes bandwidth in an analog system? A
14. Which of the following is NOT a type of modulation that can be applied to an analog signal? B
15. Which type of radio signal is most susceptible from interference sources such as lightning? A
16. Which of the following is NOT an advantage of digital modulation over analog modulation? D
17. Which binary signaling technique reduces the voltage to zero during the transmission of a 1 bit before the bit period ends. C
18. Which binary modulation technique employs NRZ coding such that the absence of a carrier signal represents a 0 bit? A
19. Which radio transmission method uses a chipping code? C
20. Which of the following is a spread spectrum technique that employs mathematical algorithms to recover lost data bits? B
Matching 2
1. a method of encoding a digital signal onto an analog carrier wave for transmission over media that does not support direct digital signal transmission, F
2. the number of times that a carrier signal changes per second. D
3. a technique that changes the number of wave cycles in response to a change in the amplitude of the input signal. G
4. a binary signaling technique that increases the voltage to represent a 1 bit but provides no voltage for a 0 bit. I
5. a technique that changes the height of a carrier wave in response to a change in the height of the input signal. B
6. a signal of a particular frequency that is modulated to contain either analog or digital data. E
7. a technique that changes the starting point of a wave cycle in response to a change in the amplitude of the input signal. J
8. the sequence of changing frequencies used in FHSS. H
9. a coding scheme that uses the numbers from 0 to 127 to represent alphanumeric characters and symbols. A
10. a signal in which the intensity (amplitude or voltage) varies continuously and smoothly over a period of time. C