A Management frame body is made up on which two components?
Answer(s): A
A management frame body in 802.11 is composed of fixed fields (mandatory, consistent structure) and information elements (variable-length, optional or protocol-specific data). This structure allows flexible communication of network information.
A STAs Network Allocation Vector (NAV) is updated by which field in RTS and CTS frames?
Answer(s): D
The Duration field in RTS and CTS frames specifies the amount of time the medium will be reserved for the ensuing transmission. Other STAs use this value to update their Network Allocation Vector (NAV) to avoid transmitting during that period.
Where, in an 802.11 Beacon frame, will you see the parameters used for QoS in the BSS?
Answer(s): C
The WMM (Wi-Fi Multimedia) Information Element in a Beacon frame advertises the QoS parameters of the BSS, including EDCA settings for different access categories. This allows clients to understand and use the QoS capabilities of the network.
The ABC organization has recently installed an 802.11ac wave 2 network. They have seen no improvement in the WLAN performance. The network administrator has noticed that his Wi-Fi client is not using 802.11ac data rates and has asked you to troubleshoot the issue. After examining the Beacon frames from the APs, you are able to explain the problem.Which part of the beacon frame allowed you to troubleshoot this problem?
802.11ac requires the use of AES-CCMP for encryption. If the RSN element shows TKIP, clients will not use 802.11ac rates because TKIP is incompatible with the high-throughput PHY features, explaining why no performance improvement is observed.
How many address fields does an ACK frame contain?
An ACK frame is a control frame used to acknowledge receipt of a data or management frame. It contains only a single address field, the Receiver Address (RA), which identifies the station being acknowledged.
You have been engaged by ABC corporation to troubleshoot a WLAN problem. Users have been reporting random disconnections. You perform Spectrum Analysis as part of your troubleshooting process and notice a frequency hopping signal across the entire 2.4 GHz band. The signal amplitude is -65 dBm and has a duty cycle of 5%.What do you conclude about this frequency hopping signal?
Answer(s): B
A duty cycle of 5% indicates the frequency hopping signal is active only a small fraction of the time. Even though the amplitude is -65 dBm, its short presence means it rarely overlaps with Wi-Fi transmissions, making it unlikely to cause the reported random disconnections.
Which one of the following provides the most accurate indication that packets have not been successfully received by the intended recipient?
Gaps in sequence numbers in captured frames indicate that one or more packets were not successfully received by the intended recipient, providing a direct and reliable indication of lost frames. CRC errors or retries suggest issues but do not always confirm packet loss to the receiver.
What is the maximum number of client stations that can receive concurrent OFDMA transmissions from an 802.11ax AP in a 20 MHz channel?
In 802.11ax (Wi-Fi 6), a 20 MHz channel can be divided into up to nine 2–RUs (Resource Units) for OFDMA, allowing the AP to transmit concurrently to a maximum of nine client stations in a single OFDMA downlink transmission.
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