Which protocol is an improvement over WEP and uses EAP, TKIP, and RC4?

The correct answer is WPA, which stands for Wi-Fi Protected Access. This protocol was specifically designed to address the vulnerabilities found in WEP (Wired Equivalent Privacy). WPA enhances data security by implementing the Extensible Authentication Protocol (EAP), which allows for a more flexible and robust authentication process. Moreover, it uses Temporal Key Integrity Protocol (TKIP), which dynamically changes keys as data is transmitted, minimizing the risks associated with key reuse that were inherent in WEP.

In contrast to WEP's static key structure and weak encryption, WPA's use of TKIP and RC4 improves both the security of data transmissions and the integrity of the keys. This makes WPA significantly more secure than its predecessor, WEP. The improvements provided by WPA laid the groundwork for WPA2 and other more advanced security protocols.

The other options in the question do not relate directly to wireless security in the same way that WPA does. WEP is the outdated protocol that WPA was designed to replace, while IPsec and L2TP serve other purposes in the realm of secure communications and tunneling, rather than addressing the specific vulnerabilities found in wireless network security.