Name and briefly describe the main 802.11 frame types used during association and data transfer.

• A. ARP, ICMP, TCP, UDP.
• B. Beacons (AP announcements), Probe requests/responses (discovery), Authentication (initial login), Association requests/responses (join AP), Data frames (user data).
• C. RTS/CTS only.
• D. Management, Control, Data only.

Answer: (B)

802.11 frames used during association and data transfer are the management and data frames that handle discovery, login, joining, and carrying user data. Beacons are sent by the access point at regular intervals to advertise the network and provide configuration details, helping clients discover the network and time their association. Probe requests and responses support discovery work: a client probes to find networks, and the AP replies with information the client needs to decide which network to join. Authentication frames establish the client’s identity with the AP as a prerequisite to joining. After authentication, the client sends an association request to join the AP, and the AP replies with an association response that confirms the connection and assigns an association ID. Once associated, data frames carry the actual user traffic between the client and the AP. Other options either refer to control frames like RTS/CTS used in some scenarios to manage medium access, or to the broad categories of frame types (management, control, data) rather than the specific frames used during the process. ARP, ICMP, TCP, and UDP are higher-layer protocols carried inside data frames, not distinct 802.11 frame types.