CIS 513 Week 5 Midterm Exam – Strayer University NEW

CIS/513 Week 5 Midterm Exam – Strayer NEW

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Chapter 1 Through 4

Chapter 1 – Introduction to Wireless Communications

TRUE/FALSE

1. VoIP phones can carry analog data over the Internet.

2. WirelessHD can transfer video and sound at 7 Gbps and higher.

3. UWB WiGig has a range of up to 100 meters.

4. The ZigBee Alliance protocols enable devices like light switches to communicate with one another.

5. RFID technology is implemented by roadside assistance services to link a vehicle and driver to a central service center.

6. 4G technology uses 100% analog transmission for voice and data.

7. An AP connects wireless devices to the wired LAN.

8. DSL is an Internet access technology that uses cable TV lines to make a network connection.

9. The job market for wireless LAN professionals is saturated and likely to decline in coming years.

10. One advantage of wireless technology is that it is immune to interference sources.

MULTIPLE CHOICE

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?
a. VoIP phone c. access point
b. wireless NIC d. Ethernet NIC

2. How can VoIP over Wi-Fi help save money?
a. by eliminating the need for a phone c. by reducing the cost of a smartphone
b. by saving on cellular phone bills d. by not requiring an access point

3. Where would you most likely find RFID tags around the house?
a. on product packages c. in the plumbing
b. in the walls and ceilings d. on the electrical lines

4. What is the typical range for the use of Bluetooth?
a. meters to kilometers c. inches to feet
b. yards to miles d. millimeters to inches

5. With what technology will you find radio modules and link managers?
a. RFID c. Wi-Fi
b. GPS d. Bluetooth

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?
a. Wi-Fi c. UWB
b. Bluetooth d. RFID

7. Automatic connections between what type of devices create a piconet?
a. VoIP c. Bluetooth
b. Infrared d. WirelessHD

8. In what type of wireless communication device will you find a repeater?
a. satellite c. antenna
b. NFC d. WNIC

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?
a. Wi-Fi 802.11 networks c. UWB A/V networks
b. cellular telephone networks d. GPS tracking networks

10. What type of cellular network uses 100 percent digital transmission for voice and data and can reach rates up to 150 Mbps?
a. CDMA c. 3G
b. 4G d. GSM

11. What kind of device does a WLAN use to facilitate communication between wireless computers?
a. Ethernet switch c. access point
b. GPS hub d. cell station

12. Which wireless standard provides for data transmission speeds up to 600 Mbps with a range up to 375 feet?
a. 802.11g c. 802.16m
b. WiGig d. 802.11n

13. Which technology uses regular phone lines and transmits at speeds up to 256 Kbps?
a. POTS c. T1
b. ISDN d. cable modem

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?
a. T1 c. WiMax
b. DSL d. ISDN

15. Where are you most likely to find the WAP2 protocol in use?
a. cellular phones c. tablets
b. laptops d. servers

16. What term refers to the combining of voice, video and text-processing and access to multiple network platforms from a single device?
a. access aggregation c. digital convergence
b. digital landscape d. network transparency

COMPLETION

1. Smartphones can use software that allow them to make ______________ phone calls over a wireless LAN instead of the cellular network.

2. Bluetooth communicates using small, low-power ______________ called radio modules.

3. In the future, most barcode functions are likely to be replaced by ___________ tags including for the purpose of inventory management.

4. To protect confidentiality, wireless data can be ______________ between the access point and wireless device, allowing only the recipient to decode the message.

5. The FCC, FDA, and EPA have established ________ exposure safety guidelines to limit the signal absorption rate of wireless device users.

MATCHING

a. 3G f. motes
b. Bluetooth g. T1
c. DSL h. UWB
d. J2ME i. WiGig
e. link manager j. WPAN

1. a wireless standard that enables devices to transmit data at up to 721.2 Kbps
over a typical maximum distance of 33 feet

2. a variation of the Java programming language designed for use in portable devices such as cellular phones

3. a very small network that typically extends to 10 meters or less

4. a technology used to transmit data over special telephone lines at 1.544 Mbps

5. an alliance of companies involved in developing a common wireless specification using the 60 GHz band

6. a technology used to transmit data over a telephone line

7. remote sensors used for collecting data from manufacturing equipment or for
scientific research

8. wireless communications technology that allows devices to transmit data at hundreds of megabits or even gigabits per second at short distances

9. a digital cellular technology that can send data at up to 21 Mbps over the cellular telephone network

10. special software in Bluetooth devices that helps identify other Bluetooth devices

SHORT ANSWER

1. Describe how RFID can enhance a family’s convenience in the kitchen.

2. Describe Bluetooth technology and how it can be used in a computing environment.

3. What is UWB and how might it be used in a home?

4. What is a piconet?

5. What does a repeater do in a satellite communication system?

6. How does a WLAN use an access point?

7. Describe a WMAN and discuss a technology a WMAN might use.

8. What is digital convergence and how might it affect how people use network devices?

9. Discuss the use of wireless technologies in home entertainment.

10. Discuss how radio signal interference can affect wireless devices.

Chapter 2 – Wireless Data Transmission

TRUE/FALSE

1. The ASCII code uses 16 bits to represent 128 different characters.

2. Infrared light interferes with radio signals but is not affected by radio signals.

3. The height of a radio wave is called the amplitude of the wave.

4. Spread-spectrum signals are more susceptible to outside interference than narrow-band transmissions.

5. Hopping codes used in FHSS transmissions are configured on the base station by the network administrator.

MULTIPLE CHOICE

1. Which of the following is true about wireless radio signal transmissions?
a. they travel at the speed of light c. they travel as discrete particles
b. they require an atmosphere to move d. they require visible light

2. Which of the following is NOT true about infrared light?
a. it can be used in directed transmissions c. it is less susceptible to interference from visible light sources
b. it can be used in diffused transmissions d. all infrared signals are invisible

3. Which of the following transmits a signal in an infrared device?
a. diffuser c. detector
b. emitter d. antenna

4. Which of the following is NOT a limitation of using infrared wireless systems?
a. they lack mobility c. someone can eavesdrop from another room
b. they use a line-of-sight principle d. diffused transmissions have a range of 50 feet

5. Which of the following is a good application for an infrared wireless system?
a. stream movies from a server c. whole house wireless network
b. wireless outdoor speakers d. data transfer between laptop and camera

6. Which best describes an analog signal?
a. it starts and stops c. consists of discrete pulses
b. intensity varies and is continuous d. Morse code is an example

7. What process must occur to transmit a digital signal over an analog medium?
a. modulation c. decoding
b. decoupling d. emitting

1

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?
a. amplitude c. carrier
b. wavelength d. frequency

9. The frequency of a wave is best defined as which of the following?
a. encoding of bits onto an analog wave c. a carrier wave that has been modulated
b. the voltage difference between the peak and trough of the wave d. the number of times a cycle occurs within one second

10. What is the unit of measurement for radio frequency?
a. volt c. Hz
b. rpm d. amp

3

11. What is the role of an antenna on a wireless device?
a. it receives data c. it serves as a ground signal
b. it demodulates d. it transmits and receives data

12. Which of the following is true about baud rate?
a. only one bit can be transferred per signal unit (baud) c. a baud rate of 2400 always means a bandwidth of 2400 bps
b. multiple bits can be transferred with each signal unit d. multiple signal units are needed to represent each bit

13. Which of the following best describes bandwidth in an analog system?
a. the range of frequencies that can be transmitted by a system c. the number of bytes transmitted per minute
b. the number of bits transmitted per second d. the maximum frequency supported by the medium

14. Which of the following is NOT a type of modulation that can be applied to an analog signal?
a. phase c. frequency
b. carrier d. amplitude

15. Which type of radio signal is most susceptible from interference sources such as lightning?
a. AM c. PM
b. FM d. DM

16. Which of the following is NOT an advantage of digital modulation over analog modulation?
a. better use of bandwidth c. better performance during interference
b. requires less power d. modulation techniques are simpler

17. Which binary signaling technique reduces the voltage to zero during the transmission of a 1 bit before the bit period ends.
a. NRZ-L c. RZ
b. NRZ-I d. NRZ

18. Which binary modulation technique employs NRZ coding such that the absence of a carrier signal represents a 0 bit?
a. ASK c. FSK
b. BPSK d. PSK

19. Which radio transmission method uses a chipping code?
a. FM c. DSSS
b. FHSS d. AM

20. Which of the following is a spread spectrum technique that employs mathematical algorithms to recover lost data bits?
a. frequency hopping c. narrow band
b. direct sequence d. wide band

COMPLETION

1. Data signals in a wireless communication system travel on _______________ waves.

2. A signal that is broadcast as a continuous wave is called a(n) _______________ signal.

3. When representing a wave with a garden hose, the distance between the peaks of the waves represents the ____________.

4. The _______________ non-return-to-zero encoding method represents a 1 bit by increasing voltage to a positive value and a 0 bit by decreasing the voltage to a negative value.

5. In the presence of background interference, receivers can detect a ____________ change more reliably than a frequency or amplitude change.

MATCHING

a. ASCII f. digital modulation
b. amplitude modulation g. frequency modulation
c. analog signal h. hopping code
d. baud rate i. NRZ
e. carrier signal j. PM

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

2. the number of times that a carrier signal changes per second

3. a technique that changes the number of wave cycles in response to a change in the amplitude of the input signal

4. a binary signaling technique that increases the voltage to represent a 1 bit but provides no voltage for a 0 bit

5. a technique that changes the height of a carrier wave in response to a change in the height of the input signal

6. a signal of a particular frequency that is modulated to contain either analog or digital data

7. a technique that changes the starting point of a wave cycle in response to a change in the amplitude of the input signal

8. the sequence of changing frequencies used in FHSS

9. a coding scheme that uses the numbers from 0 to 127 to represent alphanumeric characters and symbols

10. a signal in which the intensity (amplitude or voltage) varies continuously and smoothly over a period of time

SHORT ANSWER

1. Describe the components in an infrared wireless system.

2. What are the advantages and limitations of an infrared wireless system?

3. Contrast analog signals with digital signals.

4. Describe how radio transmitters use a carrier signal.

5. How are radio waves transmitted using an antenna?

6. What are the three types of modulation that can be applied to an analog signal to enable it to carry information?

7. Describe amplitude modulation.

8. Describe the NRZ technique of representing bit signals.

9. What is phase shift keying? Describe how it works.

10. How are bits transmitted using DSSS? Include the chipping code in your answer.

Chapter 3 – Radio Frequency Communications

TRUE/FALSE

1. A high-pass filter allows all signals above a minimum threshold to pass through.

2. A mixer separates an input into two or more outputs.

3. TDMA was developed to overcome the problem of crosstalk.

4. A disadvantage of CDMA is that it can only carry one third the amount of data of TDMA.

5. There are no power limits imposed on devices using the unregulated bands.

MULTIPLE CHOICE

1. Which of the following is NOT a common component of all radio systems?
a. filter c. mixer
b. emitter d. antenna

2. Which of the following is a type of RF filter?
a. top-pass c. bandpass
b. mid-pass d. medipass

3. If a low-pass filter is set at 2200 MHz, which of the following signals would be allowed to pass through?
a. 2400 MHz c. 1000 MHz
b. 1500 GHz d. 23000 KHz

4. What kind of signals can result from the process of modulating a signal with data to be transmitted?
a. harmonics c. modulators
b. passbands d. sidebands

5. The sidebands of a frequency carrier are best described as which of the following?
a. the sum of the carrier signal and the highest value of the mixer output c. the average of the high and low values of the input signal
b. the difference between the highest and lowest input frequency d. the sum and difference of the highest input signal and carrier frequency

6. Which type of device is considered active device because it adds power to a signal?
a. mixer c. antenna
b. filter d. amplifier

7. Which of the following would take a transmission band of 1000 Hz and divide it into 100 channels of 10 Hz each to accommodate multiple access?
a. FDMA c. CDMA
b. TDMA d. SDMA

8. Which multiple access method overcomes the problem of crosstalk and divides the transmission time into several slots?
a. SDMA c. TDMA
b. CDMA d. FDMA

9. Which multiple access method uses a spreading code?
a. CDMA c. SDMA
b. TDMA d. FDMA

10. What type of transmission is a broadcast radio station an example of?
a. duplex c. simplex
b. half-simplex d. half-duplex

11. Which type of switching is used in a POTS system?
a. packet switching c. cellular switching
b. circuit switching d. frame switching

12. What can take place when signal strength falls close to or below the level of noise?
a. SNR c. crosstalk
b. interference d. attenuation

13. Objects in the path of a radio signal can cause which of the following?
a. crosstalk c. EMI
b. amplification d. attenuation

14. What is the term for signals that get reflected and travel different paths between transmitter and receiver arrive out of phase?
a. electro-magnetic interference c. multipath distortion
b. reflective attenuation d. phase misalignment

15. What problem can a directional antenna reduce in severity?
a. reflective attenuation c. phase misalignment
b. multipath distortion d. electro-magnetic interference

16. Which type of standard is an official standard controlled by and organization or body open to everyone?
a. de jure standards c. consortia standards
b. de facto standards d. paramount standards

17. Which standards organization functions as a clearinghouse for many types of standards development in the U.S.?
a. ETSI c. ANSI
b. IETF d. ISOC

18. Which standards body deals with user-premises equipment and satellite communications?
a. IAB c. IETF
b. TIA d. ISCO

19. Which international standards organization coordinates global communications networks and services and is actually a treaty organization?
a. IAB c. ISO
b. TIA d. ITU

20. In which frequency band will you find an 802.11 network?
a. medium frequency (MF) c. extremely high frequency (EHF)
b. super high frequency (SHF) d. very high frequency (VHF)

COMPLETION

1. A __________________ filter sets a range of frequencies that include a minimum and maximum threshold.

2. _________________ uses direct sequence spread spectrum technology.

3. ____________________ transmission is typically used in consumer devices such as CB radios or walkie talkies where you have to hold down a button while speaking.

4. A technique called ______________ array processing replaces a traditional antenna

5. _______________ transmission uses low-power, precisely timed pulses of energy that operate in the same frequency spectrum as low-end noise and is used in WiGig.

MATCHING

a. circuit switching f. license exempt spectrum
b. directional antenna g. packet switching
c. full-duplex transmission h. signal-to-noise ratio
d. half-duplex transmission i. simplex transmission
e. harmonics j. switching

1. transmission that occurs in both directions but only one way at a time

2. a switching technique in which a dedicated and direct physical connection is made between two transmitting devices

3. transmission that occurs in only one direction

4. unregulated radio frequency bands that are available in the United States to any users without a license

5. transmissions in which data flows in either direction simultaneously

6. moving a signal from one wire or frequency to another

7. data transmission that is broken into smaller units

8. an antenna that radiates the electromagnetic waves in one direction only

9. stray oscillations that result from the process of modulating a wave and that
fall outside the range of frequencies used for transmission

10. the measure of signal strength relative to the background noise

SHORT ANSWER

1. What does a filter do and why is one needed in a radio system?

2. List the three types of RF filters.

3. Why are filters found in transmitters?

4. What is the purpose of a mixer? Include a discussion of sidebands in your answer.

5. What is an amplifier and why is it a crucial component in a radio system?

6. Describe time division multiple access.

7. What are two advantages that TDMA has over FDMA?

8. What are three advantages of CDMA over TDMA?

9. What advantages does packet switching have over circuit switching for transmitting data?

10. What is multipath distortion?

Chapter 4 – How Antennas Work

TRUE/FALSE

1. Cables and connectors offer resistance to the flow of electricity, increasing the power of a signal.

2. Decibels are an absolute measurement of signal strength, making it simpler to calculate gain or loss.

3. The size of an antenna is directly proportional to the wavelength of the signal it is designed to transmit and receive.

4. A monopole antenna is a type of two-dimensional antenna.

5. Point-to-point wireless links are best served by using omnidirectional antennas.

MULTIPLE CHOICE

1. Which of the following is likely to result in a wireless signal gain?
a. cables c. connectors
b. amplifier d. atmosphere

2. What unit of measurement is a ratio between two signal levels?
a. volt c. decibel
b. watt d. ohm

3. Which value indicates the signal being measured is twice the power?
a. +3 dB c. +5 mW
b. -5 dB d. -3 mW

4. If a signal is represented as 15 mW + 10 db, what is the resulting signal strength in mW?
a. 30 mW c. 75 mW
b. 25 mW d. 150 mW

5. Which of the following refers to the gain an antenna has over a dipole antenna at the same frequency?
a. dBm c. dBi
b. dBd d. dBg

6. Which of the following is true about antennas?
a. the size is proportional to the wavelength c. most are active devices
b. lower frequency signals require larger antennas d. omnidirectional types provide the best directional gain

7. Which of the following is true about omnidirectional antennas?
a. they work best in point-to-point links c. longer ones usually have higher gain
b. they cannot be used in 802.11 applications d. they emit a signal in three dimensions

8. Which type of directional antenna is used for outdoor applications up to 16 miles?
a. cellular c. parabolic dish
b. patch d. yagi

9. A cellular phone antenna that is 13 inches long would be considered which of the following?
a. eighth-wave c. half-wave
b. quarter-wave d. full-wave

10. If an antenna is much longer than the wavelength, what is the typical result?
a. inefficient delivery of RF energy c. wrong signal frequency
b. signals that are an incorrect wavelength d. no signal is transmitted

11. What does antenna polarization determine about the performance of the antenna?
a. radiation pattern c. measurement of signals is positive or negative voltage
b. horizontal or vertical orientation d. direction of the signal

12. What type of antenna is a straight piece of wire with no reflecting ground element?
a. monopole c. horn
b. dipole d. dish

13. Which type of antenna is two-dimensional, is common in telephone networks, and is used to transmit high-power microwave signals between towers?
a. patch c. horn
b. satellite dish d. dipole

14. What type of antenna is divided into a matrix of radiating elements and are used in modern radar systems?
a. switched beam c. patch
b. horn d. phased array

15. When a coaxial cable connects the antenna to the transmitter, what property of the cable must match that of the antenna?
a. impedance c. length
b. thickness d. inductance

16. What type of wave propagation do RF signals transmitted at 50 MHz have?
a. ground waves c. line-of-sight waves
b. sky waves d. atmospheric waves

17. Which type of antenna should usually be used at the central location in a point-to-multipoint wireless link?
a. unidirectional c. directional
b. omnidirectional d. semi-directional

18. Which of the following is the elliptical region within which signals travel between two antennas in a point-to-point link?
a. troposphere radius c. Fresnel zone
b. propagation limit d. wave pattern

19. What is the signal strength necessary to meet a receiver’s minimum requirements?
a. transmission path c. minimum wavelength
b. Fresnel zone d. link budget

20. What is the maximum percent of the Fresnel zone that can be blocked by obstructions in a point-to-point link?
a. 20% c. 40%
b. 60% d. 10%

COMPLETION

1. ______________ is the effect of an amplifier boosting the power of a signal.

2. A radio signal’s power does not change in a linear fashion, but instead changes ______________.

3. _____________ is a relative measurement used to represent gain or loss in a signal.

4. When considering antenna size, lower frequencies require ___________ antennas.

5. A _________________ analyzer is a tool that displays the signal amplitude and frequency of a radio transmission.

MATCHING

a. antenna pattern f. ground-plane
b. dB isotropic g. isotropic radiator
c. dBm h. passive antenna
d. dipole i. patch antenna
e. free space loss j. smart antenna

1. the signal loss that occurs as a result of the tendency of RF waves to spread

2. a theoretically perfect sphere that radiates power equally in all directions

3. the relative measurement of the gain of an antenna when compared to a theoretical isotropic radiator

4. a new type of antenna that uses a signal processor and an array of narrow beam elements

5. a graphic that shows how a signal radiates out of an antenna

6. a semi-directional antenna that emits a wide horizontal beam and an even
wider vertical beam

7. a metal disc or two straight wires assembled at 90 degrees, used to provide
a reflection point for monopole antennas

8. a relative way to indicate an absolute power level in the linear watt scale

9. can only radiate a signal with the same amount of energy that appears at the antenna connector

10. an antenna that has a fixed amount of gain over that of an isotropic radiator

SHORT ANSWER

1. List three of the four aspects of RF signal transmission you need to know.

2. Describe the “tens and threes of RF mathematics”.

3. What is an isotropic radiator?

4. Describe directional gain and how it can be accomplished with a passive antenna.

5. What are two types of directional antenna? Describe them.

6. What is free space loss? Describe how it occurs.

7. How does the size of an antenna affect its ability to transmit and receive?

8. What does an antenna pattern show about the RF wave?

9. What does antenna polarization tell you about the antenna wave? How is it important for signal reception?

10. Give two examples of two-dimensional antennas. Describe them.