There are many EAP types, and each one has its own benefit and downside. The EAP type defines the authentication mechanism to be used with EAP, which is usually self-evident in its name. Most of EAP types are not discussed in this book, due to lack of adoption or lack of inclusion in the exam blueprint, such as EAP-Kerberos.
The EAP types can be broken down into two categories: native EAP types and tunneled EAP types. A tunneled EAP type simply uses a nontunneled EAP inside a Transport Layer Security (TLS) tunnel between the supplicant and the authenticator. See Figures 4-3 and 4-4 for a graphical representation of native and tunneled EAPs.