Wireless Communication Final Study Guide (All) SOLUTION LATEST EDITION 2023/24 ALL 100% CORRECT GUARANTEED GRADE A+

digital VoIP phones carry _________ data over the Internet. WirelessHD _____________ can transfer video and sound at 7 Gbps and higher. 10 UWB WirelessHD and WiGig have a range of up to ___ meters. GPS _____ technology is implemented by roadside assistance services to link a vehicle and driver to a central service center. 4G _____ technology uses 100% digital transmission for voice and data. AP A(n) ____ connects wireless devices to the wired LAN. Disadvantages ______________ of wireless technology is that it is susceptible to interference & security issues, as well as possible health risks . ASCII The ______ code uses 8 bits to represent 128 different characters. Infrared __________ light neither interferes with other types of communications signals (such as radio signals) nor is it affected by other signals, except light. amplitude The height of a radio wave is called the ___________ of the wave. Hopping __________ codes used in FHSS transmissions are predefined and the transmitter and receiver must agree beforehand on which sequence to use. high-pass A ____________ filter allows all signals above a minimum threshold to pass through. TDMA ______ was developed to overcome the problem of crosstalk. power limits The FCC does impose __________ __________ on devices using the unregulated bands, which in effect reduces their ranges. b. wireless NIC 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 b. wireless NIC c. access point d. Ethernet NIC c. inches to feet What is the typical range for the use of Bluetooth? a. meters to kilometers b. yards to miles c. inches to feet d. millimeters to inches c. Bluetooth Automatic connections between what type of devices create a piconet? a. VoIP b. Infrared c. Bluetooth d. WirelessHD b. cellular telephone networks 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 b. cellular telephone networks c. UWB A/V networks d. GPS tracking networks d. 802.11n Which wireless standard provides for data transmission speeds up to 600 Mbps with a range up to 375 feet? a. 802.11g b. WiGig c. 802.16m d. 802.11n c. WiMax 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 b. DSL c. WiMax d. ISDN a. they travel at the speed of light Which of the following is true about wireless radio signal transmissions? a. they travel at the speed of light b. they require an atmosphere to move c. they travel as discrete particles d. they require visible light b. intensity varies and is continuous Which best describes an analog signal? a. it starts and stops b. intensity varies and is continuous c. consists of discrete pulses d. Morse code is an example a. modulation What process must occur to transmit a digital signal over an analog medium? a. modulation b. decoupling c. decoding d. emitting b. wavelength 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 b. wavelength c. carrier d. frequency c. Hz What is the unit of measurement for radio frequency? a. volt b. rpm c. Hz d. amp d. it transmits and receives data What is the role of an antenna on a wireless device? a. it receives data b. it demodulates c. it serves as a ground signal d. it transmits and receives data b. carrier Which of the following is NOT a type of modulation that can be applied to an analog signal? a. phase b. carrier c. frequency d. amplitude a. AM Which type of radio signal is most susceptible from interference sources such as lightning? a. AM b. FM c. PM d. DM d. modulation techniques are simpler Which of the following is NOT an advantage of digital modulation over analog modulation? a. better use of bandwidth b. requires less power c. better performance during interference d. modulation techniques are simpler c. RZ Which binary signaling technique reduces the voltage to zero during the transmission of a 1 bit before the bit period ends. a. NRZ-L b. NRZ-I c. RZ d. NRZ a. ASK Which binary modulation technique employs NRZ coding such that the absence of a carrier signal represents a 0 bit? a. ASK b. BPSK c. FSK d. PSK c. DSSS Which radio transmission method uses a chipping code? a. FM b. FHSS c. DSSS d. AM b. direct sequence Which of the following is a spread spectrum technique that employs mathematical algorithms to recover lost data bits? a. frequency hopping b. direct sequence c. narrow band d. wide band b. emitter Which of the following is NOT a common component of all radio systems? a. filter b. emitter c. mixer d. antenna c. bandpass Which of the following is a type of RF filter? a. top-pass b. mid-pass c. bandpass d. medipass a. harmonics What kind of signals can result from the process of modulating a signal with data to be transmitted? a. harmonics b. passbands c. modulators d. sidebands d. the sum and difference of the highest input signal and carrier frequency 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 b. the difference between the highest and lowest input frequency c. the average of the high and low values of the input signal d. the sum and difference of the highest input signal and carrier frequency d. amplifier Which type of device is considered active device because it adds power to a signal? a. mixer b. filter c. antenna d. amplifier c. TDMA Which multiple access method overcomes the problem of crosstalk and divides the transmission time into several slots? a. SDMA b. CDMA c. TDMA d. FDMA a. CDMA Which multiple access method uses a spreading code? a. CDMA b. TDMA c. SDMA d. FDMA c. simplex What type of transmission is a broadcast radio station an example of? a. duplex b. half-simplex c. simplex d. half-duplex b. circuit switching Which type of switching is used in a POTS system? a. packet switching b. circuit switching c. cellular switching d. frame switching b. interference What can take place when signal strength falls close to or below the level of noise? a. SNR b. interference c. crosstalk d. attenuation d. attenuation Objects in the path of a radio signal can cause which of the following? a. crosstalk b. amplification c. EMI d. attenuation b. multipath distortion What problem can a directional antenna reduce in severity? a. reflective attenuation b. multipath distortion c. phase misalignment d. electro-magnetic interference a. de jure standards Which type of standard is an official standard controlled by and organization or body open to everyone? a. de jure standards b. de facto standards c. consortia standards d. paramount standards c. ANSI Which standards organization functions as a clearinghouse for many types of standards development in the U.S.? a. ETSI b. IETF c. ANSI d. ISOC d. ITU Which international standards organization coordinates global communications networks and services and is actually a treaty organization? a. IAB b. TIA c. ISO d. ITU b. super high frequency (SHF) In which frequency band will you find an 802.11 network? a. medium frequency (MF) b. super high frequency (SHF) c. extremely high frequency (EHF) d. very high frequency (VHF) encrypted To protect confidentiality, wireless data can be ______________ between the access point and wireless device, allowing only the recipient to decode the message. electromagnetic Data signals in a wireless communication system travel on _______________ waves. phase In the presence of background interference, receivers can detect a ____________ change more reliably than a frequency or amplitude change. bandpass A __________________ filter sets a range of frequencies that include a minimum and maximum threshold. Half-duplex ____________________ transmission is typically used in consumer devices such as CB radios or walkie talkies where you have to hold down a button while speaking. decreasing Cables and connectors offer resistance to the flow of electricity, ____________ the power of a signal. Decibels ___________ are a relative measurement of signal strength, making it simpler to calculate gain or loss. antenna The size of an ___________ is inversely proportional to the wavelength of the signal it is designed to transmit and receive. one A monopole antenna is a type of ____-dimensional antenna. directional Point-to-point wireless links are best served by using ____________ antennas. 10 WPAN technologies are designed to connect devices that are typically up to ____ meters apart. WPAN One of the advantages of ________ technologies is their conservative use of battery power. hard The lower levels of the Bluetooth protocol stack are implemented in the ____ware. omnidirectional An _______________ antenna transmits a signal in all directions with relatively equal intensity. 1MHz Bluetooth divides the 2.4 GHz frequency into 79 frequencies that are spaced _____ apart. ISM ZigBee networks utilize the _____ frequency band(s). c. hard drive to memory Which of the following is not an example of a Bluetooth communication? a. cellular phone to PDA b. notebook computer to PDA c. hard drive to memory d. notebook computer to GPS piconet The _________ coordinator in a WirelessHD network, should be a device that is plugged into an electric outlet. Being powered by batteries, they may be turned off or go into power-save mode frequently. beacon The Asynchronous power save (APS) mode allows devices to sleep for long periods of time until they choose to wake up and listen to a _________. UWB _____ is capable of handling multiple data streams, including HD television. b. amplifier Which of the following is likely to result in a wireless signal gain? a. cables b. amplifier c. connectors d. atmosphere c. decibel What unit of measurement is a ratio between two signal levels? a. volt b. watt c. decibel d. ohm a. +3 dB Which value indicates the signal being measured is twice the power? a. +3 dB b. -5 dB c. +5 mW d. -3 mW d. 150 mW If a signal is represented as 15 mW + 10 db, what is the resulting signal strength in mW? a. 30 mW b. 25 mW c. 75 mW d. 150 mW b. lower frequency signals require larger antennas Which of the following is true about antennas? a. the size is proportional to the wavelength b. lower frequency signals require larger antennas c. most are active devices d. omnidirectional types provide the best directional gain c. longer ones usually have higher gain Which of the following is true about omnidirectional antennas? a. they work best in point-to-point links b. they cannot be used in 802.11 applications c. longer ones usually have higher gain d. they emit a signal in three dimensions d. yagi CONTINUED...