The 802.11 Frame Control field is a 16-bit (2-byte) field that is present at the beginning of every 802.11 MAC header. This field is composed of multiple subfields that define the protocol version, frame type, subtype, and other specific characteristics. Several of these subfields are single-bit flags that indicate a particular state or attribute. These flags include To DS, From DS, More Fragments, Retry, Power Management, More Data, Protected Frame, and Order. Each flag, when set to 1, signals a specific condition, such as the frame being destined for the Distribution System (To DS) or being a retransmission (Retry).

A. All 802.11 frame types (Management, Control, and Data) contain a Frame Control field; it is a fundamental component of the MAC header.

B. The Duration/ID field, which is a separate field following the Frame Control field, is used to communicate the duration value.

D. The Frame Control field's value changes constantly to reflect the specific type, subtype, and attributes of each transmitted frame.

1. IEEE Computer Society. (2021). IEEE Standard for Information Technology--Telecommunications and Information Exchange between Systems Local and Metropolitan Area Networks--Specific Requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications. IEEE Std 802.11-2020. Section 9.2.4.1, "Frame Control field," pp. 678-681. This section explicitly details the structure of the Frame Control field, showing its various subfields, including the multiple 1-bit flags.

2. Kurose, J. F., & Ross, K. W. (2017). Computer Networking: A Top-Down Approach (7th ed.). Pearson. Chapter 6, "The Link Layer and LANs," Section 6.3.2, "802.11 Wireless LANs," describes the 802.11 frame structure, illustrating the Frame Control field and its constituent subfields and flags.

3. University of California, Santa Barbara, Department of Computer Science. (n.d.). CS 176B: Network Computing - Lecture 10: Wireless and Mobile Networks. Retrieved from https://www.cs.ucsb.edu/~ebelding/courses/176b/w18/lectures/10Wireless.pdf. Slide 21, "802.11 MAC Frame," provides a clear diagram of the Frame Control field, breaking it down into its subfields and identifying the 1-bit flags.