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Wi-Fi Standards and Access Points
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Wi-Fi Standards and Access Points

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Questions and Answers

Which IEEE committee is responsible for the standards of wireless networks?

  • IEEE 802.16 committee
  • IEEE 802.3 committee
  • IEEE 802.15 committee
  • IEEE 802.11 committee (correct)

    • What frequency range does the 802.11a standard operate in?

  • 6 gigahertz
  • 2.4 gigahertz
  • 3.5 gigahertz
  • 5 gigahertz (correct)

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

  • NFC Forum
  • IEEE 802.11 committee
  • Wi-Fi Alliance (correct)
  • Bluetooth SIG

    • What was the speed of the 802.11a wireless standard upon its release?

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

    What is the purpose of RFID in manufacturing or inventory management?

    <p>To track inventory and manage assembly lines</p> Signup and view all the answers

    What type of RFID tag is typically used in access badges?

    <p>Flat tag with antenna around the outside</p> Signup and view all the answers

    How do RFID tags communicate without a battery?

    <p>By converting radar signals to power</p> Signup and view all the answers

    What is the purpose of NFC in mobile devices?

    <p>To communicate with other devices and make payments</p> Signup and view all the answers

    What is the primary function of a third party in installing outdoor networks?

    <p>To provide expertise in installation</p> Signup and view all the answers

    What does an active or powered RFID tag have that passive tags do not?

    <p>A battery inside</p> Signup and view all the answers

    How is NFC utilized in unlocking doors?

    <p>By using a separate access card</p> Signup and view all the answers

    What is the significance of using NFC in checking out at a store?

    <p>To enable payment through mobile devices</p> Signup and view all the answers

    Which wireless standard operates at 5 GHz frequencies and has a shorter range due to signal absorption?

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

    Which wireless standard operates in the 2.4 GHz range with a maximum speed of 11 Mbps?

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

    Which wireless standard was released in 2003 as a backward-compatible upgrade to 802.11b with a maximum speed of 54 Mbps?

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

    Which wireless standard upgrades 802.11a, b, and g, offering a maximum theoretical throughput of 600 Mbps and introduces Multiple Input Multiple Output (MIMO) technology?

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

    Which wireless standard operates exclusively in the 5 GHz band, supports up to 160 MHz of channel bandwidth, and offers a maximum total throughput of nearly 7 Gbps?

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

    Which wireless standard released in 2009 operates in both 2.4 GHz and 5 GHz bands?

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

    Which wireless standard supports Multi-User MIMO, allowing multiple users to communicate over multiple input and output simultaneously?

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

    Which wireless standard uses signaling modulation to increase the amount of data that can be transferred at any particular time?

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

    Which frequency range is used by more devices, leading to potential frequency conflicts?

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

    'Wi-Fi 4' is an upgrade to which previous wireless standards?

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

    What technology does 'Wi-Fi 5' (802.11ac) introduce to allow for more data transfer at the same time?

    <p>Multi-User MIMO</p> Signup and view all the answers

    Which standard operates at both 2.4 gigahertz and 5 gigahertz frequencies and supports orthogonal frequency division multiple access (OFDMA) technology?

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

    Which standard supports up to four streams of multiple input and multiple output (MIMO) and has a total theoretical throughput per stream of 150 megabits per second or a maximum theoretical throughput of 600 megabits per second?

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

    Which standard has a maximum theoretical throughput maximum of 6.9 gigabits per second and uses 5 gigahertz technology?

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

    Which standard has a maximum theoretical throughput of 9.6 gigabits per second and operates at both 2.4 gigahertz and 5 gigahertz frequencies?

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

    Which standard introduced orthogonal frequency division multiple access (OFDMA) technology to improve communication efficiency in areas with large numbers of people?

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

    Which standard had a maximum theoretical throughput per stream of 54 megabits per second and operated on 5 gigahertz frequencies?

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

    Which standard had a maximum theoretical throughput of 54 megabits per second and was an upgrade to 802.11b?

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

    Which standard had a maximum theoretical throughput of 11 megabits per second and operated at 2.4 gigahertz?

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

    What is the range of a Wi-Fi access point using built-in antennas?

    <p>~40-50 meters</p> Signup and view all the answers

    What technology supports eight downloadable streams of multi-user MIMO at 867 megabits per second for each stream?

    <p>Wi-Fi 6</p> Signup and view all the answers

    What form of communication was introduced in the standard 802.11ax to improve communication efficiency in areas with large numbers of people?

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

    Study Notes

    • 802.11ac and 802.11ax access points support both 2.4 gigahertz and 5 gigaherz frequencies, while communication at 2.4 gigahertz uses the 802.11n standard and 5 gigahertz uses the ac or ax standard.
    • The 802.11ax or Wi-Fi 6 standard, which arrived in February 2021, operates at 2.4 gigahertz and 5 gigahertz frequencies and supports orthogonal frequency division multiple access (OFDMA) technology.
    • OFDMA is a new form of communication introduced in 802.11ax to improve communication efficiency in areas with large numbers of people.
    • 802.11a, which operated on 5 gigahertz frequencies, had a maximum theoretical throughput per stream of 54 megabits per second.
    • 802.11b, operating at 2.4 gigahertz, had a maximum theoretical throughput of 11 megabits per second.
    • 802.11g, an upgrade to 802.11b, had a maximum theoretical throughput of 54 megabits per second.
    • 802.11n, which operates in both 2.4 gigahertz and 5 gigahertz frequency ranges, supports up to four streams of multiple input and multiple output (MIMO) and has a total theoretical throughput per stream of 150 megabits per second or a maximum theoretical throughput of 600 megabits per second.
    • 802.11ac, which is a 5 gigahertz technology, supports eight downloadable streams of multi-user MIMO at 867 megabits per second for each stream and has a maximum theoretical throughput maximum of 6.9 gigabits per second.
    • 802.11ax, also known as Wi-Fi 6, operates at both 2.4 gigahertz and 5 gigahertz frequencies and supports eight streams, each with a maximum theoretical throughput per stream of 1.2 gigabits per second and a maximum theoretical throughput of all streams at 9.6 gigabits per second.
    • The range of a Wi-Fi access point is about 40-50 meters using built-in antennas, but for long-range fixed wireless networks, directional antennas may be needed and regulations regarding frequencies and signal strength must be considered.
    • Installing an antenna outside for a wireless network requires safety considerations, such as being aware of power sources and lightning protection.

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    Description

    Test your knowledge about Wi-Fi standards, access points, and frequency bands with this quiz. Explore the differences between 802.11n, 802.11ac, and 802.11ax standards along with their operating frequencies.

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