Wi-Fi Standards and Throughput Quiz
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Questions and Answers

When did the 802.11a wireless standard get released?

  • 2005
  • 1999 (correct)
  • 2003
  • 2010

    • At what frequency range does the 802.11a standard operate?

  • 1 gigahertz
  • 2.4 gigahertz
  • 10 gigahertz
  • 5 gigahertz (correct)

    • What organization is responsible for testing the interoperability of different wireless devices?

  • LAN MAN Alliance
  • IEEE 802 committee
  • IEEE LAN MAN standards committee
  • Wi-Fi Alliance (correct)

    • What was the speed of the 802.11a wireless standard when it was first released?

    <p>54 megabits per second</p> Signup and view all the answers

    What is the main reason for using 5 GHz spectrum instead of 2.4 GHz?

    <p>To have access to more available frequencies for communication</p> Signup and view all the answers

    What is the significance of the ISM part of the 2.4 GHz band?

    <p>It is an area that can be used without special licensing</p> Signup and view all the answers

    What is a common characteristic of Bluetooth devices?

    <p>They are often used in personal area networks</p> Signup and view all the answers

    What is the purpose of industrial Bluetooth standards?

    <p>To enable Bluetooth communication over long distances</p> Signup and view all the answers

    How do larger bandwidths such as 40 MHz, 80 MHz, and 160 MHz benefit communication?

    <p>They enable faster data throughput</p> Signup and view all the answers

    Why are Bluetooth and 802.11 commonly associated with the 2.4 GHz band?

    <p>To utilize an unlicensed frequency range suitable for mass use</p> Signup and view all the answers

    Which standard allows for a maximum theoretical throughput of 600 megabits per second with four antennas?

    <p>802.11n</p> Signup and view all the answers

    What does MIMO stand for in the context of wireless communication?

    <p>Multiple Input, Multiple Output</p> Signup and view all the answers

    Which standard operates exclusively in the 5 gigahertz range?

    <p>802.11ac</p> Signup and view all the answers

    What feature was introduced in the 802.11ac standard to allow multiple users to communicate simultaneously?

    <p>MIMO - Multiple Input, Multiple Output</p> Signup and view all the answers

    Which standard supports up to eight multi-user MIMO streams with a total throughput of nearly seven gigabits per second?

    <p>802.11ac</p> Signup and view all the answers

    What does OFDMA stand for in the context of wireless networks?

    <p>Orthogonal Frequency Division Multiple Access</p> Signup and view all the answers

    In areas with large numbers of people, which standard was designed to maintain efficiency in wireless communication?

    <p>802.11ax</p> Signup and view all the answers

    'Wi-Fi 5' is the new name given to which standard?

    <p>'Wi-Fi 5'</p> Signup and view all the answers

    Why do objects around us tend to absorb signals in a five gigahertz network?

    <p>Due to the higher frequency of the network</p> Signup and view all the answers

    What is a characteristic of the 2.4 gigahertz range used by 802.11b networks?

    <p>Signals bounce off devices</p> Signup and view all the answers

    Why might someone choose a slower 802.11b network over a faster 802.11a network?

    <p>To achieve longer distance in their network</p> Signup and view all the answers

    What is a challenge posed by the 2.4 gigahertz frequency range for wireless networks?

    <p>Interference from other devices using the same frequency</p> Signup and view all the answers

    Why is the 802.11g standard considered a useful upgrade for 802.11b networks?

    <p>Offers backward compatibility with 802.11b devices</p> Signup and view all the answers

    What makes the 802.11n standard an upgrade for 802.11a, b, and g networks?

    <p>Allows simultaneous operation at 5 gigahertz and 2.4 gigahertz frequencies</p> Signup and view all the answers

    Which Wi-Fi standard is referred to as Wi-Fi 4?

    <p>802.11n</p> Signup and view all the answers

    What is a reason someone might choose 802.11a over 802.11b in a warehouse environment?

    <p>Due to the open space providing better signal propagation</p> Signup and view all the answers

    '802.11g' operates in which frequency range?

    <p>2.4 gigahertz only</p> Signup and view all the answers

    Which frequency conflict could be a challenge when using Wi-Fi networks?

    <p>Interference from baby monitors and cordless phones</p> Signup and view all the answers

    What was one advantage of upgrading from '802.11g' to '802.11n'?

    <p>Dual-band operation if supported by the access point</p> Signup and view all the answers

    What makes 'Wi-Fi 4' different from previous Wi-Fi standards such as 'Wi-Fi 1' and 'Wi-Fi 2'?

    <p>Refers to upgraded versions of '802.11a', '802.11b', '802.11g'</p> Signup and view all the answers

    What is the maximum theoretical throughput of 802.11ax per stream?

    <p>1.2 gigabits per second</p> Signup and view all the answers

    If you're connecting two buildings with 802.11, what type of antenna would be required?

    <p>Yagi antenna</p> Signup and view all the answers

    Which 802.11 technology can operate in both the five gigahertz and 2.4 gigahertz frequency ranges?

    <p>802.11ac</p> Signup and view all the answers

    What is the maximum throughput of 802.11n when using four separate streams?

    <p>600 megabits per second</p> Signup and view all the answers

    In long-range fixed wireless networks, what type of antennas are typically used for point-to-point connections?

    <p>Yagi antenna</p> Signup and view all the answers

    What is the maximum throughput of 802.11a?

    <p>54 megabits per second</p> Signup and view all the answers

    Which frequency range does 802.11b operate in?

    <p>2.4 gigahertz</p> Signup and view all the answers

    How many streams can 802.11ac support for multi-user, multi input, multi output?

    <p>Eight streams</p> Signup and view all the answers

    Which technology is widely used for unlocking doors by holding up an access badge to a sensor?

    <p>RFID</p> Signup and view all the answers

    What powers RFID tags that do not have a battery?

    <p>Radar technology</p> Signup and view all the answers

    What type of RFID tags have a power source and are referred to as active or powered RFID?

    <p>Active RFID</p> Signup and view all the answers

    What technology allows mobile devices like phones and smartwatches to have two-way conversations with other devices?

    <p>NFC</p> Signup and view all the answers

    What type of wireless communication technology is often used for payments at stores using mobile devices?

    <p>NFC</p> Signup and view all the answers

    Which frequency range is commonly associated with 802.11 networks?

    <p>Both 2.4 GHz and 5 GHz</p> Signup and view all the answers

    What is the purpose of having separate channels within frequency ranges used in 802.11 networks?

    <p>To enable communication on multiple frequencies simultaneously</p> Signup and view all the answers

    What is one reason for ensuring that each access point in a specific area operates on a different wireless channel?

    <p>To minimize wireless interference between access points</p> Signup and view all the answers

    What is the purpose of governmental agencies responsible for managing wireless spectrum related to 802.11 networks?

    <p>To regulate which frequencies can be utilized and set limits on power and interference</p> Signup and view all the answers

    Study Notes

    • IEEE 802.11 committee is responsible for wireless networking standards.
    • First wireless standard, 802.11a, released in 1999, operates exclusively in 5 GHz frequency range, and max speed is 54 Mbps.
    • Higher frequencies result in less range due to signal absorption by objects.
    • 802.11b, released around the same time, operates in 2.4 GHz range with a max speed of 11 Mbps.
    • 2.4 GHz frequencies are commonly used by other devices leading to frequency conflicts and limited range.
    • 802.11g, released in 2003, is a backward compatible upgrade to 802.11b, operates in 2.4 GHz range, and has a max speed of 54 Mbps.
    • 802.11n, released in 2009, is an upgrade to 802.11a, b, and g, operates at both 5 GHz and 2.4 GHz simultaneously, has wider channel widths, and max theoretical throughput of 600 Mbps.
    • Introduced MIMO (Multiple Input Multiple Output) technology.
    • 802.11ac, released in 2014, operates exclusively in 5 GHz range, supports wider channel widths, max theoretical throughput of nearly 7 Gbps, and uses multi-user MIMO.
    • 802.11ax or Wi-Fi 6, released in 2021, supports both 5 GHz and 2.4 GHz frequencies, wide channel widths, and max theoretical throughput per channel of about 1.2 Gbps.
    • Introduced orthogonal frequency division multiple access (OFDMA) technology to improve efficiency in areas with large numbers of people.

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    Description

    Test your knowledge on Wi-Fi standards and their maximum throughputs with this quiz. Learn about the differences between 802.11a, 802.11b, 802.11g, and 802.11n networks.

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