PEAP (Protected Extensible Authentication Protocol) is a version of EAP, the authentication protocol used in wireless networks and Point-to-Point connections.
PEAP (Protected Extensible Authentication Protocol) fully encapsulates EAP and is designed to work within a TLS (Transport Layer Security) tunnel that may be encrypted but is authenticated. The EAP (Extensible Authentication Protocol) was developed to provide an authentication framework that can be used for both Point-Point connections as well as wireless networks. A. Protected Extensible Authentication Protocol (PEAP) is an 802.1X authentication type for wireless LANs (WLANs). PEAP provides strong security, user database extensibility, and support for one-time token authentication and password change or aging.  A. Protected Extensible Authentication Protocol (PEAP) is an 802.1X authentication type for wireless LANs (WLANs). PEAP provides strong security, user database extensibility, and support for one-time token authentication and password change or aging. • The framework for PEAP Phase 2 authentication is extensible, and the client can be authenticated using methods such as EAP-GTC and Microsoft Challenge Authentication Protocol (MS-CHAP) Version 2 within the TLS tunnel. PEAP does not specify an authentication method, but provides additional security for other EAP authentication protocols, such as EAP-Microsoft Challenge Handshake Protocol version 2 (MS-CHAP v2), that can operate through the TLS-encrypted channel provided by PEAP. 1 Support for the fragmentation and reassembly of messages, allowing the use of EAP types that do not provide this functionality. 2  Clients with the ability to authenticate an NPS server or other RADIUS server. 3  Because the server also authenticates the client, mutual authentication occurs. The Protected Extensible Authentication Protocol, also known as Protected EAP or simply PEAP, is a protocol that encapsulates EAP within a potentially encrypted and authenticated Transport Layer Security (TLS) tunnel. Extensible Authentication Protocol, or EAP, is an authentication framework frequently used in wireless networks and point-to-point connections. It is defined in RFC 3748, which made RFC 2284 obsolete, and was updated by RFC 5247 What is PEAP? PEAP (Protected Extensible Authentication Protocol) is a version of EAP, the authentication protocol used in wireless networks and Point-to-Point connections. PEAP is designed to provide more secure authentication for 802.11 WLANs (wireless local area networks) that support 802.1X port access control. Currently in draft status, the protocol is gaining support and is expected to displace Cisco's proprietary Lightweight Extensible Authentication Protocol (LEAP). PEAP addresses the shortcomings of 802.11 security, shared key authentication being chief among these. CRYPTOCARD BlackShield. The Extensible Authentication Protocol (EAP) is a protocol for wireless networks that expands on authentication methods used by the Point-to-Point Protocol (PPP), a protocol often used when connecting a computer to the Internet. 
http://www.tech-faq.com/eap-leap-peap-and-eap-tls-and-eap-ttls.html http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1200-series/prod_qas0900aecd801764fa.pdf http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1200-series/prod_qas0900aecd801764fa.html https://technet.microsoft.com/en-us/library/dd197437(v=ws.10).aspx https://en.wikipedia.org/wiki/Extensible_Authentication_Protocol http://searchsecurity.techtarget.com/definition/PEAP-Protected-Extensible-Authentication-Protocol http://searchsecurity.techtarget.com/definition/Extensible-Authentication-Protocol-EAP
what is protected extensible authentication protocol