Which of the following protocols is used for authentication in an 802.1X framework?

A.
IPSec

B.
TKIP

C.
EAP

D.
L2TP

Explanation:
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. EAP can support multiple authentication mechanisms, such as token cards, smart cards, certificates, one-time passwords, and public key encryption authentication. In communications using EAP, a user requests connection to a wireless network through an access point (a station that transmits and receives data, sometimes known as a transceiver). The access point requests identification (ID) data from the user and transmits that data to an authentication server. The authentication server asks the access point for proof of the validity of the ID. After the access point obtains that verification from the user and sends it back to the authentication server, the user is connected to the network as requested. EAP is an authentication framework, not a specific authentication mechanism. It provides some common functions and negotiation of authentication methods, called EAP methods. There are currently about 40 different methods defined. The methods defined in IETF RFCs include EAP-MD5, EAP- OTP, EAP-GTC, EAP-TLS, EAP-IKEv2, EAP-SIM, and EAP-AKA.The commonly used modern methods capable of operating in wireless networks include EAP-TLS, EAP-SIM, EAP-AKA, PEAP, LEAP, and EAP-TTLS.

Answer D is incorrect. Layer 2 Tunneling Protocol (L2TP) is a more secure version of Point-to-Point Tunneling Protocol (PPTP). It provides tunneling, address assignment, and authentication. L2TP allows transfer of Pointto- Point Protocol (PPP) traffic between different networks. L2TP combines with IPSec to provide both tunneling and security for Internet Protocol (IP), Internetwork Packet Exchange (IPX), and other protocol packets across IP networks.

Answer A is incorrect. Internet Protocol Security (IPSec) is a method of securing datA.It secures traffic by using encryption and digital signing. It enhances the security of data as if an IPSec packet is captured, its contents cannot be read. IPSec also provides sender verification that ensures the certainty of the datagram’s origin to the receiver.

Answer B is incorrect. TKIP (Temporal Key Integrity Protocol) is an encryption protocol defined in the IEEE 802.11i standard for wireless LANs (WLANs). It is designed to provide more secure encryption than the disreputably weak Wired Equivalent Privacy (WEP). TKIP is the encryption method used in Wi-Fi Protected Access (WPA), which replaced WEP in WLAN products. TKIP is a suite of algorithms to replace WEP without requiring the replacement of legacy WLAN equipment. TKIP uses the original WEP programming but wraps additional code at the beginning and end to encapsulate and modify it. Like WEP, TKIP uses the RC4 stream encryption algorithm as its basis.

Reference. http.//en.wikipediA.org/wiki/IEEE_802.1X#cite_note-0