True/False
Indicate whether the
statement is true or false.
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1.
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Wireless signals experience attenuation.
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2.
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Spread spectrum is a popular way of making wireless transmissions more
secure.
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3.
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Wireless networks are laid out using the same topologies as wired
networks.
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4.
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An ad hoc arrangement would work well for a WLAN with many users.
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5.
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WiMAX is defined by the IEEE 802.11 standard.
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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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In wireless communication, to exchange information, two antennas must be tuned
to the same ____.
a. | frequency | c. | attenuation speed | b. | variance | d. | port |
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2.
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A directional antenna issues wireless signals along a(n) ____ direction.
a. | open | c. | wide | b. | narrow | d. | single |
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3.
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In ____, a wireless signal splits into secondary waves when it encounters an
obstruction.
a. | reflection | c. | diffraction | b. | scattering | d. | bounce back |
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4.
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____ is a significant problem for wireless communications because the atmosphere
is saturated with electromagnetic waves.
a. | Attenuation | c. | Diffraction | b. | Fading | d. | Interference |
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5.
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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.
a. | mobile | c. | fixed | b. | variable | d. | open |
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6.
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In the case of connecting two WLANs, access points could be as far as ____ feet
apart.
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7.
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In ____ scanning, the station transmits a special frame, known as a probe, on
all available channels within its frequency range.
a. | active | c. | fixed | b. | passive | d. | open |
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8.
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A unique characteristic of the 802.11 data frame is its ____ field.
a. | Frame Control | c. | Data | b. | Sequence Control | d. | Duration |
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9.
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The average geographic range for an 802.11a antenna is ____ meters.
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10.
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____ is the least popular WLAN standard.
a. | 802.11a | c. | 802.11g | b. | 802.11b | d. | 802.11n |
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11.
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An 802.11g antenna has a geographic range of ____ meters.
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12.
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____ may use either the 2.4-GHz or 5-GHz frequency range.
a. | 802.11a | c. | 802.11g | b. | 802.11b | d. | 802.11n |
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13.
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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.
a. | Channel bonding | c. | Frame aggregation | b. | Channel aggregation | d. | Frame bonding |
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14.
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____ is an 802.11n network feature allowing the combination of multiple frames
into one larger frame.
a. | Channel bonding | c. | Frame aggregation | b. | Channel aggregation | d. | Frame bonding |
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15.
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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.
a. | ipconfig | c. | config | b. | iwconfig | d. | ivconfig |
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16.
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If intermittent and difficult-to-diagnose wireless communication errors occur,
____ might be the culprit.
a. | incorrect encryption | c. | interference | b. | SSID mismatch | d. | incorrect antenna
placement |
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17.
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Most satellites circle the Earth ____ miles above the equator in a
geosynchronous orbit.
a. | 100 | c. | 6,000 | b. | 1240 | d. | 22,300 |
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18.
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____ satellites are the type used by the most popular satellite data service
providers.
a. | Transponder | c. | Low earth orbiting | b. | Medium earth orbiting | d. | Geosynchronous earth
orbiting |
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19.
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Which satellites transmit and receive signals in the 12 to 18 GHz band?
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20.
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Clients are able to exchange signals with satellites as long as they have a ____
path.
a. | view | c. | proprietary | b. | line-of-sight | d. | directional |
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21.
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To establish a satellite Internet connection, each subscriber must have a
____.
a. | dish antenna | c. | dish pathway | b. | line-of-sight antenna | d. | source pathway |
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Completion
Complete each
statement.
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1.
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The use of multiple frequencies to transmit a signal is known as
____________________ technology.
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2.
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The ____________________ is a unique character string used to identify an access
point.
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3.
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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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4.
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802.11b and g signals can extend a maximum of ____________________ feet and
still deliver data reliably.
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5.
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____________________ means that satellites orbit the Earth at the same rate as
the Earth turns.
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Matching
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Match each item with a statement below: a. | mobile wireless | f. | 802.11b | b. | fixed wireless | g. | 802.11a | c. | access
point | h. | 802.11g | d. | uplink | i. | 802.11n | e. | downlink |
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1.
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Uses the 2.4–2.4835-GHz frequency range.
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2.
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The locations of the transmitter and receiver do not move.
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3.
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Uses channels in the 5-GHz band and provides a maximum theoretical throughput
of 54 Mbps.
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4.
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Accepts wireless signals from multiple nodes and retransmits them to the rest
of the network.
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5.
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Represents the connection between a carrier’s antenna and a
client’s transceiver.
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6.
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Uses the 2.4-GHz frequency band and provides a maximum theoretical throughput
of 54 Mbps.
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7.
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The receiver can be located anywhere within the transmitter’s
range.
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8.
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Refers to the connection between a client’s transceiver and the
carrier’s antenna.
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9.
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Boasts a maximum throughput of 600 Mbps.
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Short Answer
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1.
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Describe the wireless spectrum.
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2.
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Describe how interference can distort and weaken a wireless signal.
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3.
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Describe the FHSS and DSSS spread spectrum technologies.
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4.
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Describe the use of CSMA/CA (Carrier Sense Multiple Access with Collision
Avoidance) to access a shared medium.
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5.
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Define reassociation and provide two examples explaining when it occurs.
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6.
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List and describe the three groups into which frame types are divided.
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7.
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What is the purpose of the Frame Control field in an 802.11 frame?
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8.
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Define and explain the MIMO innovation in the 802.11n standard. Include a
description of the advantages it provides.
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9.
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Discuss what must be taken into account when placing an access point on a
WLAN.
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10.
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Describe what an administrator can do if during a wireless router configuration,
something goes awry.
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