Wireless Network Standards Overview
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Questions and Answers

What is the primary function of the antenna in the context of RFID technology?

  • To increase the range of communication
  • To store data for future transmission
  • To generate RFID signals
  • To capture signals and convert them to power (correct)

    • What distinguishes active RFID tags from passive ones?

  • Active RFID tags can transmit data longer distances
  • Active RFID tags are cheaper to produce
  • Active RFID tags require less maintenance
  • Active RFID tags have their own power source (correct)

    • NFC technology primarily enables what type of interaction between mobile devices?

  • One-way data transfer
  • Two-way communication (correct)
  • Long-range communication
  • High-speed internet access

    • In which scenario might NFC be used according to the provided content?

    <p>To unlock a door using a mobile device</p> Signup and view all the answers

    How do mobile devices utilize NFC technology during transactions?

    <p>By associating credit cards to enable payments</p> Signup and view all the answers

    What is the maximum speed achieved by the 802.11a standard?

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

    Which frequency range does the 802.11b standard operate in?

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

    Why is the 802.11a standard not commonly seen in use today?

    <p>It has been replaced by faster and newer standards.</p> Signup and view all the answers

    What type of network do we often refer to when discussing 802.11 standards?

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

    What characteristic distinguishes the signal propagation of the 802.11a standard from the 802.11b standard?

    <p>802.11a uses higher frequencies leading to more signal absorption.</p> Signup and view all the answers

    When was the 802.11a standard initially released?

    <p>October 1999</p> Signup and view all the answers

    What is the typical maximum speed of the 802.11b standard?

    <p>11 megabits per second</p> Signup and view all the answers

    How does the Wi-Fi Alliance contribute to wireless networking standards?

    <p>By testing the interoperability of different wireless devices.</p> Signup and view all the answers

    What is the main advantage of using the 2.4 gigahertz frequency for wireless networks?

    <p>Longer transmission distances</p> Signup and view all the answers

    Which standard is known for operating exclusively in the 5 gigahertz range?

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

    What technology introduced by 802.11n allows for transferring more information simultaneously?

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

    Which wireless standard is referred to as Wi-Fi 6?

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

    What maximum throughput can 802.11ac theoretically achieve?

    <p>7 gigabits per second</p> Signup and view all the answers

    Which of the following is a limitation of the 2.4 gigahertz frequency?

    <p>It experiences frequency conflicts with other devices</p> Signup and view all the answers

    What is a key feature of the 802.11n standard regarding channel widths?

    <p>Supports channel widths up to 160 megahertz</p> Signup and view all the answers

    What is the relationship between 802.11g and 802.11b?

    <p>802.11g is an upgrade for 802.11b</p> Signup and view all the answers

    How many streams can 802.11ac support for multi-user MIMO?

    <p>8</p> Signup and view all the answers

    What is a benefit of using the 802.11n standard?

    <p>Can operate on both 2.4 gigahertz and 5 gigahertz simultaneously</p> Signup and view all the answers

    Which upgrade to wireless networking happened in February 2021?

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

    Which statement regarding 802.11 frequency bands is true?

    <p>802.11n can operate on both 2.4 gigahertz and 5 gigahertz</p> Signup and view all the answers

    What does the term 'signaling modulation' refer to in the context of Wi-Fi 5?

    <p>Enhancing data transfer capabilities</p> Signup and view all the answers

    What technology does 802.11ax introduce to improve communication in crowded areas?

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

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

    <p>867 megabits per second</p> Signup and view all the answers

    What frequency bands does 802.11n operate on?

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

    What is one primary benefit of using multi-user MIMO in 802.11ax?

    <p>Supports simultaneous download and upload streams</p> Signup and view all the answers

    Which antenna type is best suited for long-range point-to-point connections?

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

    What is the maximum theoretical throughput of 802.11ax across all streams?

    <p>9.6 gigabits per second</p> Signup and view all the answers

    What is a common application of RFID technology?

    <p>Unlocking doors with access badges</p> Signup and view all the answers

    In what scenario would fixed directional antennas be necessary?

    <p>Connecting two buildings wirelessly</p> Signup and view all the answers

    What is the maximum throughput per stream for 802.11ax?

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

    What regulation considerations are essential when installing outdoor antennas?

    <p>Signal power and safety requirements</p> Signup and view all the answers

    Which 802.11 standard introduced MIMO technology?

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

    What is the function of an RFID tag?

    <p>Store and transmit identification information</p> Signup and view all the answers

    What is the primary frequency range for 802.11b technology?

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

    Which feature distinguishes 802.11ax from previous standards?

    <p>Ability to communicate in congested areas efficiently</p> Signup and view all the answers

    Study Notes

    Wireless Network Standards

    • Wireless networks are common in homes and businesses
    • Standards developed by IEEE 802 committee, specifically the 802.11 standard
    • Wi-Fi is a trademark of the Wi-Fi Alliance, responsible for testing interoperability
    • Different 802.11 standards exist, each with varying characteristics

    802.11a

    • Released in October 1999
    • Operates exclusively at 5 GHz frequency range
    • Maximum speed of 54 Mbps
    • Lower range compared to 2.4 GHz due to signal absorption by objects
    • Rarely used today, superseded by faster standards

    802.11b

    • Released around the same time as 802.11a
    • Operates in the 2.4 GHz frequency range
    • Maximum speed of 11 Mbps
    • Longer range than 802.11a due to signal bouncing off objects
    • Vulnerable to interference from other 2.4 GHz devices (baby monitors, cordless phones, Bluetooth)

    802.11g

    • Released in June 2003
    • Operates in the 2.4 GHz range
    • Upgraded speed to 54 Mbps, matching 802.11a
    • Backward compatible with 802.11b
    • Still susceptible to interference from other 2.4 GHz devices

    802.11n (Wi-Fi 4)

    • Released in 2009
    • Operates at both 5 GHz and 2.4 GHz
    • Increased bandwidth to 40 MHz
    • Maximum theoretical throughput of 600 Mbps
    • Introduced MIMO (Multiple Input, Multiple Output) technology
    • Provides improved data transfer

    802.11ac (Wi-Fi 5)

    • Released in 2014
    • Operates exclusively in the 5 GHz range
    • Increased channel bandwidth up to 160 MHz, supporting more simultaneous channels
    • Uses signalling modulation, improving data transfer rate
    • Improved MIMO capabilities, including multi-user MIMO
    • Maximum theoretical throughput of nearly 7 Gbps

    802.11ax (Wi-Fi 6)

    • Released in 2021
    • Operates at both 5 GHz and 2.4 GHz
    • Supports channel bandwidths of 20, 40, 80, and 160 MHz
    • Maximum theoretical throughput of 9.6 Gbps per stream
    • Introduced OFDMA (Orthogonal Frequency-Division Multiple Access) for improved performance in high-density environments

    Antenna Considerations

    • Home/office networks typically use built-in antennas allowing for approximately 40-50 meters of range
    • Long-range applications require directional antennas, stronger signals, and careful consideration of regulations

    RFID (Radio Frequency Identification)

    • Wireless technology used for various applications, from access control to inventory tracking
    • RFID tags operate using radar, converting received signals to power
    • Active RFID tags use a power source
    • NFC (Near-Field Communication) extends RFID to mobile devices for payments, pairing, and access control

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    Description

    This quiz covers the key wireless network standards established by the IEEE 802 committee, focusing particularly on the 802.11 family. You'll learn about different standards such as 802.11a, 802.11b, and 802.11g, including their frequency ranges, maximum speeds, and characteristics. Test your knowledge on how these standards have evolved over the years.

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