CIS 513 Week 5 Midterm Exam – Strayer 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