Wireless LAN Communication and Coordination Functions Quiz
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Questions and Answers

What is the shortest fixed interframe space called?

  • RTS
  • PIFS
  • SIFS (correct)
  • DIFS

    • Which type of interframe spacing is used by Access Points to transition the network from DCF to PCF?

  • SIFS
  • DIFS
  • RTS
  • PIFS (correct)

    • Which interframe spacing has the highest priority among SIFS, PIFS, and DIFS?

  • PIFS
  • DIFS
  • RTS
  • SIFS (correct)

    • What does DIFS stand for in the context of interframe spacing?

    <p>Distributed-coordination Interframe Spacing</p> Signup and view all the answers

    In which mode does the AP control which stations may transmit data?

    <p>Point coordination mode</p> Signup and view all the answers

    Which interframe space is neither the shortest nor the longest, getting priority between SIFS and DIFS?

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

    What type of contention method is used by IEEE 802.3 / Ethernet networks?

    <p>CSMA/CD</p> Signup and view all the answers

    Which type of network uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)?

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

    In CSMA/CD, what happens if a collision is detected while a node is transmitting?

    <p>The node temporarily stops transmitting</p> Signup and view all the answers

    Why do wireless stations using CSMA/CA not detect collisions?

    <p>They cannot transmit and receive at the same time</p> Signup and view all the answers

    What does Interframe Spacing (IFS) ensure before a station can transmit a frame?

    <p>No other station is transmitting</p> Signup and view all the answers

    How does Interframe Spacing (IFS) provide priority access to certain frames?

    <p>By preceding certain frames with a shorter IFS</p> Signup and view all the answers

    What is the Distributed Coordination Function (DCF) in wireless LAN?

    <p>An access method that allows all stations to maintain access on the shared transmission medium using CSMA/CA protocol.</p> Signup and view all the answers

    Why can't ad hoc networks utilize Point Coordination Function (PCF)?

    <p>Ad hoc networks have no access points available to perform polling.</p> Signup and view all the answers

    What is the primary advantage of Point Coordination Function (PCF) in wireless LAN?

    <p>Guarantees a known amount of latency for applications requiring Quality of Service (QoS).</p> Signup and view all the answers

    In the Point Coordination Function process, what happens when a wireless station tells the AP that it is capable of answering a poll?

    <p>The AP begins polling each wireless station to check if they need to send data frames.</p> Signup and view all the answers

    Which type of network can use the Distributed Coordination Function (DCF) mode in wireless LAN?

    <p>BSS, ESS, and IBSS networks</p> Signup and view all the answers

    What is the main function of Access Points (APs) in wireless LAN with regard to data transmission?

    <p>To transmit data and act similarly to wired hubs.</p> Signup and view all the answers

    What is modulation coding?

    <p>Adding data to a carrier by altering the amplitude, frequency, or phase of the carrier</p> Signup and view all the answers

    Which modulation techniques are used in 802.11 and 802.11b?

    <p>DBPSK, DQPSK, GFCK</p> Signup and view all the answers

    What is orthogonal frequency division multiplexing (OFDM)?

    <p>A technique that alters the carrier signal for data transmission</p> Signup and view all the answers

    How do more complex signal encoding methods affect data rate and susceptibility to corruption?

    <p>Increase data rate and susceptibility to corruption</p> Signup and view all the answers

    Which spreading codes are used in 802.11 and 802.11b?

    <p>Barker Code, CCK</p> Signup and view all the answers

    How do higher transmission speeds impact modulation techniques?

    <p>Modulation techniques change to provide higher data throughput</p> Signup and view all the answers

    What is the purpose of the virtual carrier sense control message described in the text?

    <p>Performing Network Allocation Vector (NAV) distribution</p> Signup and view all the answers

    Which process involves a 4-way handshake and is illustrated in the text?

    <p>RTS/CTS</p> Signup and view all the answers

    What happens to the data rate of a transmitting unit when distance increases between the AP and a station?

    <p>It drops to the next lower specified data rate</p> Signup and view all the answers

    Which data rates are used for 802.11g OFDM according to the text?

    <p>6, 12, 18, 24, 36 Mbps</p> Signup and view all the answers

    Why does a wireless LAN system never drop from 11 Mbps to 10 Mbps according to the text?

    <p>10 Mbps is not a specified data rate</p> Signup and view all the answers

    What triggers a wireless LAN client to drop its data rate according to the text?

    <p>Signal strength decrease below a threshold</p> Signup and view all the answers

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