Practice Test Geeks(ACMA) Aruba Certified Mobility Associate Practice Test
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Wireless Fundamentals 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 Fundamentals flashcards as text

  1. What is the primary advantage of using 5 GHz over 2.4 GHz for wireless deployments?

    Answer: More available channels and less interference

    The 5 GHz band offers up to 25 non-overlapping 20 MHz channels in the US and experiences far less interference from consumer devices.

  2. In an 802.11 infrastructure BSS, which device is responsible for coordinating access to the wireless medium?

    Answer: The Access Point (AP)

    In infrastructure mode, the AP coordinates medium access and acts as the central point for all client communications.

  3. What technology introduced in 802.11ac Wave 2 allows an AP to transmit to multiple clients simultaneously using separate spatial streams?

    Answer: MU-MIMO

    MU-MIMO (Multi-User MIMO) was introduced in 802.11ac Wave 2, allowing an AP to transmit to multiple clients simultaneously in the downlink.

  4. Which 802.11 feature reduces power consumption by allowing a client to enter a sleep state and buffer frames at the AP?

    Answer: Target Wake Time (TWT)

    Target Wake Time (TWT), introduced in 802.11ax/Wi-Fi 6, allows clients and APs to negotiate specific times for data exchange, dramatically reducing power consumption.

  5. What is a co-channel interference (CCI) in Wi-Fi, and why does it degrade performance?

    Answer: Interference from multiple APs sharing the same channel within range

    CCI occurs when multiple APs on the same channel overlap, forcing devices to compete for airtime and increasing contention and retransmissions.

  6. In Aruba's architecture, what operating mode allows an AP to function without a controller by running all intelligence locally on the AP?

    Answer: Instant AP (IAP) mode

    Aruba Instant APs operate without a physical controller — one AP in the cluster acts as a virtual controller, running locally on the AP hardware.

  7. What is the significance of the DIFS (DCF Interframe Space) in 802.11 medium access?

    Answer: It is the mandatory idle period a station must wait before initiating a transmission

    DIFS is the minimum time a station must sense the medium as idle before initiating a data transmission in DCF mode.