Flashcards with Answers on Chapter 8

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Wireless signals experience attenuation. T/F
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T
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Spread spectrum is a popular way of making wireless transmissions more secure. T/F
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T
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Wireless networks are laid out using the same topologies as wired networks. T/F
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F
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An ad hoc arrangement would work well for a WLAN with many users. T/F
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F
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WiMAX is defined by the IEEE 802.11 standard. T/F
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F
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In wireless communication, to exchange information, two antennas must be tuned to the same __.
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Frequency
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A directional antenna issues wireless signals along a(n) __ direction.
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Single
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In __, a wireless signal splits into secondary waves when it encounters an obstruction.
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Diffraction
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__ is a significant problem for wireless communications because the atmosphere is saturated with electromagnetic waves.
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Interference
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In __ wireless systems, the transmitting antenna focuses its energy directly toward the receiving antenna which results in a point-to-point link.
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Fixed
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In the case of connecting two WLANs, access points could be as far as __ feet apart.
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1000
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In __ scanning, the station transmits a special frame, known as a probe, on all available channels within its frequency range.
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Active
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A unique characteristic of the 802.11 data frame is its __ field.
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Sequence Control
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The average geographic range for an 802.11a antenna is __ meters.
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20
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__ is the least popular WLAN standard
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802.11a
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An 802.11g antenna has a geographic range of __ meters.
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100
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__ may use either the 2.4-GHz or 5-GHz frequency range.
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802.11n
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__ is an 802.11n feature that allows two adjacent 20-MHz channels to be combined to make a 40-MHz channel.
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Channel Bonding
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__ is an 802.11n network feature allowing the combination of multiple frames into one larger frame.
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Frame Aggregation
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__ is a command-line function for viewing and setting wireless interface parameters and it is common to nearly all versions of Linux and UNIX.
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iwconfig
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If intermittent and difficult-to-diagnose wireless communication errors occur, __ might be the culprit.
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Interference
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Most satellites circle the Earth __ miles above the equator in a geosynchronous orbit.
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22,300
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__ satellites are the type used by the most popular satellite data service providers.
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Geosynchronous Orbiting
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Which satellites transmit and receive signals in the 12 to 18 GHz band?
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Ku-
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Clients are able to exchange signals with satellites as long as they have a __ path.
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Line Of Sight
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To establish a satellite Internet connection, each subscriber must have a __.
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Dish Antenna
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The use of multiple frequencies to transmit a signal is known as __ technology.
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Spread-Spectrum
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The __ is a unique character string used to identify an access point.
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SSID
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A(n) __ assesses client requirements, facility characteristics, and coverage areas to determine an access point arrangement that will ensure reliable wireless connectivity within a given area.
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Site Survey
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802.11b and g signals can extend a maximum of __ feet and still deliver data reliably.
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330
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__ means that satellites orbit the Earth at the same rate as the Earth turns.
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Geosynchronous Orbit
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Uses the 2.4-2.4835-GHz frequency range.
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802.11b
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The locations of the transmitter and receiver do not move.
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Fixed Wireless
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Uses channels in the 5-GHz band and provides a maximum theoretical throughput of 54 Mbps.
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802.11a
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Accepts wireless signals from multiple nodes and retransmits them to the rest of the network.
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Access Point
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Represents the connection between a carrier's antenna and a client's transceiver.
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Downlink
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Uses the 2.4-GHz frequency band and provides a maximum theoretical throughput of 54 Mbps.
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802.11g
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The receiver can be located anywhere within the transmitter's range.
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Mobile Wireless
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Refers to the connection between a client's transceiver and the carrier's antenna.
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Uplink
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Boasts a maximum throughput of 600 Mbps.
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802.11n
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