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Wireless Networking Fundamentals & Technologies Flashcards

7 cards from real ACMA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Wireless Networking Fundamentals & Technologies flashcards as text

  1. Which 802.11 amendment introduced OFDMA as the primary multiple-access scheme for Wi-Fi?

    Answer: 802.11ax

    802.11ax (Wi-Fi 6) introduced Orthogonal Frequency Division Multiple Access (OFDMA), enabling simultaneous transmission to multiple clients.

  2. What is the maximum number of spatial streams supported by 802.11ac Wave 2?

    Answer: 8

    802.11ac Wave 2 supports up to 8 spatial streams using MU-MIMO, enabling higher aggregate throughput.

  3. In 802.11 terminology, what is the role of the Distribution System (DS)?

    Answer: It interconnects access points within an ESS

    The Distribution System connects multiple APs together to form an Extended Service Set (ESS), enabling roaming between APs.

  4. What guard interval option did 802.11ax introduce that was NOT available in 802.11ac?

    Answer: 3200 ns

    802.11ax introduced a 3200 ns guard interval to handle outdoor and high-multipath environments with longer delay spreads.

  5. Which band characteristic makes the 5 GHz frequency range generally preferable for high-throughput applications compared to 2.4 GHz?

    Answer: More non-overlapping channels and less interference

    The 5 GHz band offers more non-overlapping channels and significantly less co-channel interference from other Wi-Fi and non-Wi-Fi devices.

  6. What does the term 'BSS Color' refer to in 802.11ax?

    Answer: A mechanism to differentiate overlapping BSSs and reduce unnecessary deferrals

    BSS Color is a field in 802.11ax beacons that identifies a specific BSS, allowing stations to ignore frames from other BSSs and reduce medium contention.

  7. Which of the following correctly describes a Hidden Node problem in wireless networks?

    Answer: Two clients that can both hear the AP but cannot hear each other, causing collisions

    The hidden node problem occurs when two clients are both in range of an AP but out of range of each other, so their transmissions collide at the AP without either knowing.