Wireless Networking Fundamentals
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Questions and Answers

What is the primary difference in frequency band between Bluetooth and NFC?

  • 2.4 GHz and 13.56 MHz (correct)
  • 2.4 GHz and 5 GHz
  • Low frequency band and high frequency band
  • Medium frequency band and low frequency band

    • Which wireless technology is most suitable for large-scale networks?

  • Wi-Fi
  • Zigbee (correct)
  • Bluetooth
  • NFC

    • What is the primary application area of Bluetooth technology?

  • Personal area networks, audio streaming, etc. (correct)
  • Industrial control systems
  • Home automation
  • Wireless sensor networks

    • How do the power consumption levels of Bluetooth and Zigbee compare?

    <p>Bluetooth has moderate power consumption, Zigbee has low</p> Signup and view all the answers

    What is the typical range of Zigbee technology?

    <p>Up to 100 meters</p> Signup and view all the answers

    What is the data rate of NFC?

    <p>Up to 424 Kbps</p> Signup and view all the answers

    What is the topology of Bluetooth technology?

    <p>Point-to-point, star</p> Signup and view all the answers

    Which technology has the shortest range?

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

    What is the primary purpose of Wireless Local Area Networks (WLANs)?

    <p>To connect machines that are moderately distanced via wireless links</p> Signup and view all the answers

    What is the primary characteristic that distinguishes wireless networks from wired networks?

    <p>Use of radio waves for communication</p> Signup and view all the answers

    Which of the following is a characteristic of WLAN technology?

    <p>Medium range data transmission via wireless links</p> Signup and view all the answers

    In a wireless network, which of the following is true about signal propagation?

    <p>Signals propagate in all directions</p> Signup and view all the answers

    What is the standard for WLAN technology?

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

    What is the frequency band used by WiFi technology?

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

    What is a major advantage of wireless networks over wired networks?

    <p>Easy and fast deployment</p> Signup and view all the answers

    What is a common challenge faced by wireless networks?

    <p>Security concerns</p> Signup and view all the answers

    What is the primary advantage of WLAN technology over wired networks?

    <p>Greater flexibility and mobility</p> Signup and view all the answers

    What is a benefit of wireless networks in terms of mobility?

    <p>Support for mobility and freedom of movement</p> Signup and view all the answers

    Which of the following is a disadvantage of WLAN technology?

    <p>Lower security</p> Signup and view all the answers

    What is a characteristic of an electromagnetic wave?

    <p>It is a type of energy</p> Signup and view all the answers

    What is the range of a typical WLAN network?

    <p>Up to 100 meters</p> Signup and view all the answers

    What is a key difference between wireless and wired networks in terms of signal reception?

    <p>Signals are received by all nodes in the wireless coverage area</p> Signup and view all the answers

    What is the primary purpose of WiFi Alliance?

    <p>To develop wireless communication protocols</p> Signup and view all the answers

    What is a major limitation of wired networks?

    <p>Rigid and difficult maintenance</p> Signup and view all the answers

    Study Notes

    Wireless Networks

    • A network is considered wireless if at least two terminals communicate via a wireless link.
    • Wireless networks are an extension of wired networks.

    Wireless vs Wired

    • Wired networks:
      • Communication via cable
      • Signals propagate in one direction only
      • Signals received only by the destination
      • Easy to implement
      • Does not support mobility
      • Rigid and difficult to maintain
      • Expensive to deploy and expand
    • Wireless networks:
      • Communication via radio waves
      • Signals spread in all directions
      • Signals received by the destination and all nodes in the wireless coverage area
      • Easy to maintain and expand
      • Less expensive deployment
      • Supports mobility

    Benefits and Challenges of Wireless Networks

    • Strong features:
      • Support mobility
      • Easy and fast deployment
      • Flexible and agile use
      • Easy and quick extension and maintenance
      • More cost-effective
    • Challenges:
      • Security
      • Energy
      • Mobility issues (location, handover, mobile addressing, etc.)

    Wireless Communication Medium

    • Electromagnetic wave: a wave that propagates through electromagnetic fields
    • Examples of wireless communication:
      • Home automation
      • Industrial automation
      • Sensor networks
      • Contactless payments
      • Access control

    Wireless Local Area Networks (WLAN)

    • Range: Medium (maximum 100 meters)
    • Purpose: Connect machines that are moderately distanced via wireless links (at the building level)
    • Standard: IEEE 802.11
    • Technology: WiFi, HipeLan2 (Europe), etc.
    • Example: A local network of a company connecting equipment via an access point

    WLAN - WiFi

    • 1997: Publication of the WiFi (Wireless Friendly) standard by WiFi Alliance
    • WiFi is a set of wireless communication protocols
    • Data rate: 5.5 Mbps, 11 Mbps (802.11.b), 54 Mbps (802.11.a, 802.11.g), 10 Gbps (high-speed)
    • Frequency band: 2.4 GHz | 5 GHz
    • Range: About 100 meters (300m)
    • Standard: IEEE 802.11.x
    • Evolution: .b, .a / g, .n / ac, ..., .ax, ...
    • Security: WEP, WPA, WPA2, WPA3
    • Architecture:
      • Infrastructure mode: connection via an access point
      • Ad-hoc mode: direct connection between devices

    Bluetooth vs ZigBee vs NFC

    • Bluetooth:
      • Technology: Wireless communication technology
      • Frequency Band: 2.4 GHz
      • Range: Short range, typically up to 100 meters
      • Data Rate: Medium data rate, up to multi-Mbps
      • Power Consumption: Moderate to high
      • Topology: Point-to-point, Star
      • Suitability for Large-Scale Networks: Limited (piconet)
      • Application Areas: Personal area networks, audio streaming, etc.
    • ZigBee:
      • Technology: Wireless communication technology
      • Frequency Band: 2.4 GHz
      • Range: Medium range, typically up to 100 meters
      • Data Rate: Low to medium data rate, up to 250 Kbps
      • Power Consumption: Low
      • Topology: Mesh
      • Suitability for Large-Scale Networks: Good (Large networks)
    • NFC:
      • Technology: Wireless communication technology
      • Frequency Band: 13.56 MHz
      • Range: Very short range, typically up to 10 centimeters
      • Data Rate: Low data rate, up to 424 Kbps
      • Power Consumption: Very Low
      • Topology: Point-to-point, peer-to-peer
      • Suitability for Large-Scale Networks: Not applicable

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    Description

    Learn about the basics of wireless networking, including the difference between wired and wireless networks and their characteristics.

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