Extensible Authentication Protocol (EAP) is an authentication protocol designed to support several different authentication mechanisms. It runs directly over the data link layer and does not require the use of Internet Protocol (IP).
Per-packet authentication and integrity protection work for the following (packet is encrypted unless otherwise noted):
It is helpful to write out a table showing the various authentication methods used in 802.11 networks (e.g., open authentication, shared-key authentication, and 802.1x authentication) with the various properties each of these authentication methods require. This will help keep them straight in your mind when taking the test.