Which part of a QoS Data frame can be used to advertise its QoS priority?
Answer(s): A
The QoS Control field in a QoS Data frame carries the Traffic Identifier (TID), which indicates the frame’s access category and priority. This allows the AP and client to handle the frame according to its QoS level.
After a successful 802.11ac network deployment you are performing a packet capture and notice many RTS/ CTS frames in your trace file regardless of the AP or BSS.Which of the following is the most likely reason for these RTS/CTS frames?
Answer(s): C
In 802.11ac networks, RTS/CTS frames often appear due to protection mechanisms like RTS/CTS or CTS-to-Self being enabled to maintain coexistence with legacy devices or mixed-mode networks. This ensures that high-throughput frames are transmitted without collisions.
Which bit in a neighboring BSS’s Beacon frame will trigger an AP to enable protection mechanism?
The Non-ERP Present bit in a neighboring BSS’s Beacon frame indicates that legacy 802.11b devices are present. APs use this information to enable protection mechanisms (such as RTS/CTS or CTS-to-Self) to prevent collisions and ensure coexistence with legacy clients.
The MAC sublayer references the data unit received from the LLC sublayer as what?
The MAC sublayer receives data from the LLC sublayer as a MAC Service Data Unit (MSDU). The MSDU is then encapsulated into an MPDU for transmission over the wireless medium.
You are using a protocol analyzer to troubleshoot a network and you notice a client frequently sending QoS Null Function frames.What do you conclude?
QoS Null Function frames are used by a client to indicate a change in its Power Management status without carrying data. They are normal in WMM Power Save operations, allowing the client to enter or exit power-save mode efficiently.
During a successful FT over-the-DS roam, which 802.11 frames are transmitted between the client and the new AP?
In a successful Fast BSS Transition (FT) over-the-DS roam, the client and new AP exchange only the Reassociation Request and Reassociation Response frames. FT allows pre-authentication and key establishment with the new AP, eliminating the need for full 802.1X/EAP or 4-Way Handshake during the roam.
Which piece of information must be transmitted in a Reassociation Request frame for a PMK Caching roam to be successful?
Answer(s): B
For a PMK Caching roam, the client includes the PMK Identifier (PMKID) in the Reassociation Request. This allows the new AP to quickly identify the pre-shared Pairwise Master Key (PMK) without performing a full 802.1X authentication, enabling a fast and seamless roam.
Which one of the following frames will not be acknowledged with an Ack frame?
Probe Request frames are management frames sent by a client to discover nearby APs. They are transmitted without expecting an ACK because the client is simply soliciting Probe Responses; in contrast, Association Requests, Association Responses, and Authentication frames are acknowledged at the MAC layer.
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