What is the first field in an 802.11 header? Duration Field Preamble Frame Control Field Sequence Control Field

Breakdown of the Problem

To determine the first field in an 802.11 header, we need to review the structure of the 802.11 (Wi-Fi) frame.

Relevant Concepts

The 802.11 header structure consists of several fields, each serving a specific purpose. The common fields found in an 802.11 header include:

1. Frame Control Field
2. Duration Field
3. Address Fields
4. Sequence Control Field

Analysis and Detail

1. Frame Control Field: This is typically the first field in the 802.11 header. It contains information about the frame type, protocol version, etc.
2. Duration Field: This field follows the Frame Control Field and indicates the duration the channel will be occupied for the transmission.
3. Sequence Control Field: This field comes after the address fields and is used for maintaining the order of frames.

Verify and Summarize

Since we are specifically looking for the first field in the 802.11 header, we can confirm that the Frame Control Field is indeed the first, followed by the Duration Field.

Final Answer

The first field in an 802.11 header is the Frame Control Field.