Wireless Communication Final StudyGuide (All)

digital

2G systems use ________ transmissions.

one

A monopole antenna is a type of ____-dimensional antenna.

hexadecimal

Electronic Product Codes are usually represented in ____________ notation.

AMPS (Advanced Mobile Phone Service)

First Generation (1G) technology is based on ______.

c. 3

How many non-overlapping channels are available in an 802.11g WLAN? a. 23 b. 11 c. 3 d. 8

c. device discovery

In the WirelessHD specification 1.1, Which of the following is NOT a function of the higher protocol layers? a. video format selection b. clock synchronization c. device discovery d. video and audio encoding and decoding

a. TDMA

In the uplink direction, 802.16 transmits using a. TDMA b. half-duplex c. TDM d. the downlink frame

c. 5 GHz U-NII

In which frequency band does WirelessHUMAN operate? a. 1-10 GHz licensed b. 10-66 GHz licensed c. 5 GHz U-NII d. 11 GHZ U-NII

WPAN

One of the advantages of ________ technologies is their conservative use of battery power.

more

RFID tags are read using RF waves and can store significantly ________ information than the bar-code system.

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 _________.

power limits

The FCC does impose __________ __________ on devices using the unregulated bands, which in effect reduces their ranges.

Multimedia

The IEEE 802.15.3c standard enables ________________ connectivity between mobile and fixed consumer devices within the home.

code

The mobile identification number(MIN) is a valid cellular telephone _____.

key

The strength of encryption relies on keeping the __________ secret as well as its length.

b. 802.11ac

What 802.11 standard under development uses up to 160 MHz bandwidth and can achieve data rates up to 7 Gbps? a. 802.11bg b. 802.11ac c. 802.11cd d. 802.11ga

b. groundpenetrating radar

What application has UWB been used for since the 1960's? a. video streaming b. ground-penetrating radar c. cellular phone towers d. automobile speed detectors

a. send commands and requests between the BS and SSs

What are header-only MAC frames used for in a WiMAX network? a. send commands and requests between the BS and SSs b. transmit setup information to the base station c. establish security protocols d. send error codes to end user devices

b. proximity

What determines whether NFC devices connect with one another? a. password b. proximity c. ID code d. address

b. 2.5G uses packet switching

What is a primary difference between 2G and 2.5G networks? a. 2.5G was only deployed in North America b. 2.5G uses packet switching c. 2.5G uses EVDO technology d. 2.5G uses HSDPA

b. CRC errors

What is the RTS/CTS protocol designed to reduce or prevent? a. negative acknowledgements b. CRC errors c. collisions d. handshakes

d. half duplex

What mode of communication is used between a passive RFID tag and a reader? a. simplex b. half simplex c. full duplex d. half duplex

b. connection between a business and another business

What would be an example of a backhaul connection? a. connection between an ISP and a business b. connection between a business and another business c. connection between two offices of a phone company d. connection between two residential users

d. handoff

When actively using a network while roaming in an ESS, the process of connecting and disconnecting from the APs in one's path is called ________. a. MIMO b. reconnect c. transfer d. handoff

b. half-duplex

When transmitting on a single frequency, all transmitters must work in which of the following modes? a. full-duplex b. half-duplex c. simplex d. half-simplex

a. larger antennas allow tags to be read at greater distances

Which of the following is true about RFID antennas? a. larger antennas allow tags to be read at greater distances b. square antennas are common c. linear antennas have more accurate reads d. circular antennas have better range

two

WiMAX uses ____ frequency channels, one for uplink and the other for downlink.

UWB

_____ is capable of handling multiple data streams, including HD television.

TDMA

______ was developed to overcome the problem of crosstalk.

Disadvantages

______________ of wireless technology is that it is susceptible to interference & security issues, as well as possible health risks .

Passive

_______________ tags do not require battery power.

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.

packet

2.5G networks transmit data over a ________-switched connection.

data

A PLCP frame is made up of three parts, which are the preamble, the header, and the _____.

bandpass

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

end-user

A last mile connection is the link between an ________ and an ISP.

antenna

A wireless NIC performs the same functions as a wired NIC except that it uses an ______________ instead of a wired connection.

security

A wireless residential gateway provides better ___________ than connecting a computer directly to the Internet.

c. begin training

After a new technology has been tested thoroughly, the next step is to ____. a. calculate the ROI b. ask for an RFP c. begin training d. ask for an RFQ

b. pilot project

After the RFPs have been received and the vendor has been selected, it is important to perform a limited trial, also known in the industry as a(n) ____. a. RFI b. pilot project c. RFQ d. WASP

electromagnetic

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

longer life span

GEO satellites are more expensive to launch than LEO satellites but have a __________.

phase

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

d. attenuation

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

c. UTP cables

Where does an AP that it using PoE get its DC power from? a. an AC outlet b. a built-in AC/DC converter c. UTP cables d. high-frequency radio waves

c. PSPS

Which 802.15.3 power-saving methods allows devices to sleep for the duration of several superframes and allows them to wake up in the middle of a superframe to transmit or receive data? a. PSPS b. APS c. PSPS d. APCI

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

b. Domain Manager

Which field of an EPC identifies the manufacturer of the product? a. Header b. Domain Manager c. Object Class d. Serial Number

c. blocker tag

Which of the following is a device that can be used to simulate the presence of a virtually infinite number of tags? a. decoy tag b. honeypot tag c. blocker tag d. firewall tag

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

c. bandpass

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

b. LMDS

Which wireless MAN technology has the ability to compete with cable TV networks in local areas, and can transmit at up to 155 Mbps? a. FSO b. LMDS c. MMDS d. WiMAX

radios

Wireless controllers incorporate most AP functions but do not have any ________.

WiMAX

With ________, the frame headers are not encrypted but the data can be sent encrypted.

ISM

ZigBee networks utilize the _____ frequency band(s).

b. Support

____ is the continued follow-up for answering questions and assisting users. a. Training b. Support c. Pilot project d. Initial test

a. Training

____ provides all users as well as support specialists with the knowledge to effectively operate and support the new wireless technology. a. Training b. RFI c. RFQ d. RFP

Hopping

__________ codes used in FHSS transmissions are predefined and the transmitter and receiver must agree beforehand on which sequence to use.

DSSS

The IEEE 802.11b standard that outlines the specifications for RF WLANs is based on ______.

5 GHz

The Unlicensed National Information Infrastructure (UNII) band operates at the _____ frequency.

STAC

The ______ protocol is used to prevent tag collisions in HF RFID.

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.

SID (System Identification Code)

The cellular carrier is identified by the phone ________.

MTSO

The cellular network _________ connects a base station with a wired telephone network.

b. QoS

The change the 802.11e amendment made to the MAC layer to enable WLAN traffic to be prioritized is called __________. a. RSNA b. QoS c. VoWLAN d. WPA2

encrypted

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

c. cordless IP phones

Using VoWLAN instead of a traditional business telephone system means that the company has? a. 802.11a b. 802.11g c. cordless IP phones d. VoIP router

10

WPAN technologies are designed to connect devices that are typically up to ____ meters apart.

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

b. beamforming

What do 802.11n devices employ to direct a transmission back to the device from which a frame was received? a. spatial multiplexing b. beamforming c. MIMO d. antenna diversity

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. modulation

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

b. spatial multiplexing

What technique does WirelessHD employ to support data rates over 25 Gbps? a. LRP b. spatial multiplexing c. HDMI d. beamforming

AES

Security for IEEE 802.15.3 HR WPANs is based on ________________, a symmetric key encryption mechanism.

d. help desk

A ____ is a central point of contact for users who need assistance using technology. a. WASP b. SOHO router c. wireless FSO d. help desk

d. request for proposal

A ____ is a detailed planning document that is sent to potential vendors with precise specifications for the products and services that the organization intends to buy. a. request for comments b. request for information c. request for investment d. request for proposal

tag

A __________ is a small component that contains an antenna and an integrated circuit chip.

high-pass

A ____________ filter allows all signals above a minimum threshold to pass through.

Certificate

A ______________ authority is a private company that verifies the authenticity of each user in order to discourage fraud.

one

A baseband transmission consists of only _____ data channel.

d. full-wave

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

Logarithmically

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

Message

Short ________________ Services remains one of the most widely used cellular phone applications.

AP

A(n) ____ connects wireless devices to the wired LAN.

a. recurring

A(n) ____ cost is a cost that a user may continue to pay over an extended period of time. a. recurring b. upfront c. initial d. one-time

c. RFI

A(n) _________ seeks to gain information about what vendors may have to offer. a. RFP b. TCO c. RFI d. ROI

mobile

A(n) ________________ identification number is a unique 10-digit number generated from the phone's telephone number and is not used on phones that use a SIM card.

Wireless site survey

A(n) ____________________ consists of measuring the strength and quality of the signal and the resulting transmission speeds and throughput achievable in all the different locations.

bridge

An AP acts as a(n) ____________ between the wired and wireless networks.

omnidirectional

An _______________ antenna transmits a signal in all directions with relatively equal intensity.

b. acts as a bridge

Aside from acting as the base station for the wireless network, what other function does an AP perform? a. it routes packets b. acts as a bridge c. proxy server d. it performs as a firewall

c. Bluetooth

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

1MHz

Bluetooth divides the 2.4 GHz frequency into 79 frequencies that are spaced _____ apart.

decreasing

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

cells

Cellular telephony works by dividing the coverage area into sections called _______.

ROI

Determining the cost in relationship to the benefits is known as calculating ______________________________.

d. the device that carries out a paging procedure and establishes a connection

How is the master device determined in a Bluetooth network? a. the device with the lowest address number b. the device with the highest priority hop sequence on the piconet c. the first device to send out an inquiry message to discover other devices d. the device that carries out a paging procedure and establishes a connection

c. 96

How many bits are used in an electronic product code? a. 48 b. 32 c. 96 d. 128

a. 4, 2 GHz

How many channels and what is the width of each 802.15.3c channel? a. 4, 2 GHz b. 6, 200 MHz c. 11, 25 MHz d. 14, 50 MHz

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

a. inefficient delivery of RF energy

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

a. use Ad hoc mode

If three friends each have a laptop computer and they want to exchange files wirelessly but nobody has an AP, what should they do? a. use Ad hoc mode b. use infrastructure mode c. use the Basic Service Set d. use the Extended Service Set

d. the client is "polled" by the AP

In PCF, the client devices cannot transmit unless ________. a. the WLAN is operating in P2P mode b. the AP sends and ACK frame c. the AP sends data first d. the client is "polled" by the AP

b. send a probe frame

In active scanning, what does the client do initially to start the association process? a. poll the access point b. send a probe frame c. send a beacon with the requested SSID d. transmit an associate request frame

b. broadband

In what type of link are multiple signals sent simultaneously over the medium at different frequencies? a. baseband b. broadband c. ultraband d. multiband

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)

c. 5 GHz

In which frequency range does WHDI operate? a. 2.4 GHz b. 800 MHz c. 5 GHz d. 400 KHz

a. half-duplex

Interrogators and tags communicate using _________ communications. a. half-duplex b. full-duplex c. simplex d. complex

c. 120 Mbps

Over short distances, WiMAX can communicate at speeds of up to ____ in the 10-66 GHz bands. a. 100 Mbps b. 70 Mbps c. 120 Mbps d. 30 Mbps

directional

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

major

RFID is expected to have a _______ impact on network traffic.

ASCII

The ______ code uses 8 bits to represent 128 different characters.

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

amplitude

The height of a radio wave is called the ___________ of the wave.

hard

The lower levels of the Bluetooth protocol stack are implemented in the ____ware.

b. 2 Mbps

The original IEEE 802.11 standard, established in 1997, was for WLANs operating at what maximum speed? a. 1 Mbps b. 2 Mbps c. 3 Mbps d. 4 Mbps

handoff

The process of a new cell taking over a user's call is called a ________.

b. roaming

The process of connecting to cell outside the user's home area is called which of the following? a. handoff b. roaming c. switching d. routing

interrogator

The purpose of an __________ is to read information from the tags.

375 feet

The range of an AP base station is approximately _________ in an environment with no obstructions and little interference.

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

antenna

The size of an ___________ is inversely proportional to the wavelength of the signal it is designed to transmit and receive.

baseband

The technique that treats the entire transmission medium as if it were only one channel is called _____.

10

UWB WirelessHD and WiGig have a range of up to ___ meters.

large

VPNs encrypt a connection for security and consume a _________ amount of processing resources.

digital

VoIP phones carry _________ data over the Internet.

c. destroy password

What can be transmitted to a tag that permanently disables it? a. cyclic redundancy check b. kill switch c. destroy password d. collision token

b. digital certificate

What do manufacturers install in every WiMAX device for authentication purposes? a. encryption code b. digital certificate c. hashing algorithm d. authentication protocol

a. RF waves

What do passive tags use to power the built-in chip and transmit information? a. RF waves b. lithium battery c. IR energy d. visible light

b. beamforming

What does WiGig use to maintain reliable connections at very high frequencies? a. single-carrier modulation b. beamforming c. OFDM d. protocol adaptation layers

c. piconet

What is created when a Bluetooth network has one master and at least one slave using the same channel? a. scatternet b. wi-fi net c. piconet d. bluenet

b. handoff

What is it called when a user begins moving toward another cell and the cellular phone automatically associates with the base station of that cell? a. roaming b. handoff c. multiplexing d. hunting

b. last mile

What is the common name for connections that begin at a service provider, go through the local neighborhood, and end at the home or office? a. mile b. last mile c. ISP d. link

a. shorter range

What is the disadvantage of an 802.11a WLAN compared to an 802.11b WLAN? a. shorter range b. higher error rate c. more interference sources d. lower bandwidth

c. 40%

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

c. backoff interval

What is the period of time devices must wait after the medium is clear before attempting to transmit? a. collision timeframe b. signal data rate c. backoff interval d. synchronization period

a. help prevent adjacent channel interference

What is the purpose of a guard band? a. help prevent adjacent channel interference b. help prevent co-channel interference c. helps prevent outside EM interference d. helps prevent intersymbol interference

"Do we really need it?"

What is the question that must be asked first when deciding whether to add a wireless infrastructure to a business?

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

d. link budget

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

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. Hz

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

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

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

a. STAC

What protocol do HF RFID transmissions use in which the tags reply within randomly selected time intervals, referred to as slots? a. STAC b. UHF c. DSSS d. EPCIS

a. data exchange protocol

What protocol does NFC use to transfer data between two smartphones? a. data exchange protocol b. transmission control protocol c. user datagram protocol d. trivial file transfer protocol

c. circuit switching

What technology is used on 1G cellular networks to make the dedicated connection between caller and recipient? a. packet switching b. frame switching c. circuit switching d. segment switching

d. impulse modulation

What term is used for the technique in which the amplitude, polarity, or position of an analog pulse represents either a 1 or a 0? a. biphase modulation b. mesh networking c. direct-sequence UWB d. impulse modulation

a. frequency division multiplexing

What term is used when WiMAX uses one frequency for downlink and another for uplink? a. frequency division multiplexing b. time division multiplexing c. multi-frequency transmission d. dual-frequency transmission

d. adaptive modulation

What transmission technique helps WiMAX use the channel bandwidth more efficiently? a. latency b. automatic repeat requests c. FEC d. adaptive modulation

a. monopole

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

d. phased array

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

d. inductive

What type of coupling is used in NFC between a smartphone and a tablet computer? a. backscatter b. capacitive c. physical d. inductive

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. simplex

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

b. TDMA

What type of transmission method does an 802.15.3 piconet use during the CTAP? a. SDMA b. TDMA c. FDMA d. CDMA

c. decibel

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

b. there is a shortage of qualified staff to deploy and support it

When a business decides to deploy 802.11 wireless technology, it may face problems because? a. this new technology is not a mature technology b. there is a shortage of qualified staff to deploy and support it c. managers are unfamiliar with it d. old technology is always easier to work with

a. impedance

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

Larger

When considering antenna size, lower frequencies require ___________ antennas.

b. 802.11e

Which IEEE standard supports QoS and enables prioritization of frames in DCF? a. 802.11f b. 802.11e c. 802.11d d. 802.11c

b. MAC

Which RFID layer is responsible for establishing and communicating the transmission parameters? a. PHY b. MAC c. Tag ID d. Network

b. toll collection

Which application most likely uses Microwaves in the 2.45 and 5.8 GHz ISM band? a. animal identification b. toll collection c. asset tracking d. smart cards

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. 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. 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

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. PHY

Which layer in a ZigBee device is responsible for detecting the presence of an RF signal in the currently selected channel? a. LLC b. PHY c. MAC d. Upper

b. Listen

Which mode must an NFC-capable device be in to behave like a smart card? a. Poll b. Listen c. Initiator d. Smart card

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

b. emitter

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

b. video streaming

Which of the following is NOT a likely application for WPAN technologies? a. home control systems b. video streaming c. industrial control systems d. security systems

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

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. reliability

Which of the following is NOT and advantage of FSO? a. cost b. speed of installation c. reliability d. security

a. they change the computer's internal data from serial to parallel before transmitting

Which of the following is NOT true about wireless NICs? a. they change the computer's internal data from serial to parallel before transmitting b. you can connect an external wireless NIC to a USB port c. they have an antenna instead of a cable port d. notebook computers often use Mini PCI cards for wireless NICs

a. They are small and can operate on batteries.

Which of the following is a feature of WPAN devices? a. They are small and can operate on batteries. b. They can transmit signals at a great distance. c. They transmit signals that do not penetrate walls. d. Their users cannot roam.

d. ONS

Which of the following is a mechanism for discovering information about a product and related services and is modeled after DNS? a. EPC b. UPC c. SKU d. ONS

c. backscatter

Which of the following is a type of coupling designed for tags that can be read at distances greater than 3.3 feet? a. inductive b. magnetic c. backscatter d. reductive

b. frequency sharing

Which of the following is an advantage of MMDS? a. signal strength b. frequency sharing c. security d. availability

d. paper document identification

Which of the following is an application for a chipless tag? a. theft prevention b. toll collection c. tracking pallets or containers d. paper document identification

c. neighbor piconet

Which of the following is described as a piconet that has its own PNC but depends on the original piconet's PNC to allocate a private block of time when its devices are allowed to transmit? a. child piconet b. parent piconet c. neighbor piconet d. subordinate piconet

b. amplifier

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

c. serves as a router

Which of the following is not a function of an AP? a. sends and receives RF signals b. connects to the wired network c. serves as a router d. acts as a bridge between the wired and wireless networks

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

c. Fresnel zone

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

c. MTSO

Which of the following is the link between a cellular phone network and the wired telephone world? a. SIM card b. Base Station c. MTSO d. IMEI

b. the cell phone carrier can temporarily store messages

Which of the following is true about SMS? a. it uses the Internet for message transfer b. the cell phone carrier can temporarily store messages c. message size is limited to about 10,000 characters d. about one million messages are sent annually worldwide

c. IEEE 802.15.1 is the Bluetooth standard

Which of the following is true about WPAN standards? a. IEEE developed standards for protocols above layer 2 b. industry alliances developed specifications for layers 1 and 2 c. IEEE 802.15.1 is the Bluetooth standard d. 802.16n is the ZigBee standard

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

a. an AP can reject the request based on the client MAC address

Which of the following is true about client's associating with an AP? a. an AP can reject the request based on the client MAC address b. a client can be associated to multiple APs simultaneously for fault tolerance c. a client can re-associate with another AP in a BSS d. if a client is not preconfigured for a specific AP, it will not attempt to associate

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. it is connection-oriented

Which of the following is true about the MAC layer for WiMAX? a. it depends on the upper layers for privacy b. it supports multiple frequency bands c. only a single service can use a link at a given time d. it is connection-oriented

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

a. contention access period

Which part of an 802.15.3 superframe is used for association and command communication? a. contention access period b. beacon c. channel time allocation period d. management channel time allocation

b. 60 GHz

Which radio band does the 802.15.3c standard use? a. 5.0 GHz b. 60 GHz c. 2.4 GHz d. p00 MHz

c. DSSS

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

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

c. Class-3

Which tag class includes battery-assisted tags and are sometimes called semi-active? a. Class-1 b. Class-2 c. Class-3 d. Class-4

b. FHSS

Which transmission technique is used by Bluetooth devices? a. Narrowband b. FHSS c. DHSS d. UWB

d. PAN coordinator

Which type of ZigBee device controls the network in a star topology? a. all end-node devices b. reduced function device c. full-function device d. PAN coordinator

c. horn

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 b. satellite dish c. horn d. dipole

b. omnidirectional

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

c. Upfront

Which type of cost is one that is necessary to start a project? a. Permanent b. Recurring c. Upfront d. Continuous

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

d. yagi

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

d. FSO

Which type of point-to-point connection is infrared-based? a. WiMAX b. LMDS c. MMDS d. FSO

a. AM

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

a. LEO

Which type of satellite has a 20 to 40 millisecond signal latency and are expected to be in high demand for the rural telephone service market? a. LEO b. MEO c. GEO d. HEO

d. GEO

Which type of satellite has a 250 millisecond latency, requires only three to cover the Earth, and has a lifespan more than 15 years? a. LEO b. MEO c. HEO d. GEO

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

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

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

c. MMDS

Which wireless MAN technology can transmit up to 2 Mbps downstream at distances up to five miles? a. FSO b. LMDS c. MMDS d. WiMAX

c. WiMAX

Which wireless MAN technology communicates with data rates up to 70 Mbps in the 2-11 GHz bands? a. LMDS b. FSO c. WiMAX d. MMDS

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

a. It transmits an unencrypted 24-bit key

Why is WEP considered far inferior to WPA and WPA2? a. It transmits an unencrypted 24-bit key b. More secure than RADIUS c. AP cannot properly authenticate client devices d. Does not support cncryption at all

b. to account for quiet time

Why is the SIFS time in the 802.11g standard effectively extended to 16 microseconds? a. for compatibility with 802.11a b. to account for quiet time c. to allow 802.11n devices on the network d. to achieve data rates higher than 11 Mbps

a. point coordinated function

With which channel access method does the AP ask each computer if it wants to transmit? a. point coordinated function b. CSMA/CA c. CSMA/CD d. virtual carrier sensing

a. VoWLAN

____ takes advantage of Voice over IP (VoIP) technology but instead of using the wired network to carry voice calls, VoWLAN uses the wireless infrastructure to carry both voice and data. a. VoWLAN b. WLAN c. WMAN d. WiMAX

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.

Low

_______ frequency RFID tags are used in applications such as animal identification.

Infrared

__________ light neither interferes with other types of communications signals (such as radio signals) nor is it affected by other signals, except light.

NFC

__________ requires little or no configuration and devices connect automatically when they are brought within about 1.6 inches of each other.

Wireless

__________ technology can provide access to corporate data from almost any location.

Decibels

___________ are a relative measurement of signal strength, making it simpler to calculate gain or loss.

Backscatter

____________ modulation is based on variations of amplitude shift keying.

WirelessHD

_____________ can transfer video and sound at 7 Gbps and higher.

DB

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

Gain

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

Beamforming

_____________________ uses multiple radios and antennas to steer a signal in the direction of the receiver.