This document defines the Extensible Authentication Protocol (EAP),
an authentication framework which supports multiple authentication
methods. EAP typically runs directly over data link layers such as
Point-to-Point Protocol (PPP) or IEEE 802, without requiring IP. EAP
provides its own support for duplicate elimination and
retransmission, but is reliant on lower layer ordering guarantees.
Fragmentation is not supported within EAP itself; however, individual
EAP methods may support this.

This document obsoletes RFC 2284. A summary of the changes between
this document and RFC 2284 is available in Appendix A.