After investigating the WMM element in a Beacon Frame you notice the TXOP Limit for the Best Effort access category is set to 0.What does this indicate?
Answer(s): C
A TXOP (Transmission Opportunity) limit of 0 for the Best Effort access category indicates that only a single frame can be transmitted per TXOP for that category. This setting limits frame bursting and ensures fair medium access across all traffic categories.
Which one of the following devices typically has a 100% duty cycle?
Analog video cameras transmit a continuous video signal, resulting in a nearly 100% RF duty cycle. Other devices like IoT sensors, Bluetooth mice, or Wi-Fi APs transmit intermittently, so their duty cycles are much lower.
ABC corporation has an 802.11n wireless network and advertises 3 SSIDs on all APs: Corporate, Guest, and BYOD. Both the Guest and the BYOD networks broadcast their SSIDs but the corporate SSID is hidden. A client transmits a Wildcard\Any Probe Request frame on channel 36. From the client’s location it can decode beacons frames from two of the organization’s APs operating on channel 36. How many Probe Response frames would you expect this client to decode from ABC corporation’s APs?
Each AP on channel 36 will respond to a Wildcard/Any Probe Request with a Probe Response for each broadcast SSID. Since the Corporate SSID is hidden, it will not respond to a wildcard probe. Assuming the two APs each broadcast the Guest and BYOD SSIDs, the client will decode 2 Probe Responses per AP, totaling 4 Probe Responses.
In which field of the MAC header would you find the protected bit and retry bit?
Answer(s): D
The Frame Control field in the 802.11 MAC header contains control bits including the Protected Frame (indicating encryption) and Retry (indicating retransmission) bits, along with other flags that define the frame type and behavior.
Protocol analyzers require the installation of a customized driver to place a USB adapter into which mode that allows capture of all wireless frames on the channel?
Monitor mode allows a wireless adapter to capture all frames on a channel, including those not addressed to the adapter. Protocol analyzers require a customized driver to enable this mode, which is essential for full WLAN traffic analysis.
When using WMM Power Save (WMM-PS), a client requests buffered data frames by sending which type of frame?
Answer(s): A
In WMM Power Save (WMM-PS), a client in power-save mode sends a WMM PS-Poll frame to the AP to request delivery of buffered frames for its traffic queues. This allows efficient power management while ensuring timely data delivery.
Which value does not change per EDCA Access Category?
Answer(s): B
Slot Time is a PHY-layer parameter that remains constant across all EDCA Access Categories. In contrast, AIFSN, CWmin, and CWmax are EDCA parameters that vary per access category to provide different priority levels for traffic.
A STA utilizing DCF for medium access, that has been waiting for the medium to become free, must wait for which interframe space following the ACK of the previous frame transmission?
In DCF (Distributed Coordination Function), a station waits for a DCF Interframe Space (DIFS) after receiving an ACK before attempting a new frame transmission. This ensures proper medium arbitration and fair access among contending stations.
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