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what is the difference between ccna and ccna secur.7. LEAPThe LightweightExtensibleAuthenticationProtocol(LEAP) is specifically mentioned here because it is the CiscoEAP method that is still visible in 802.11bCiscoEAP method that is still visible in 802.11b networks. LEAP is vulnerable to offline attacks and should be avoided at all costs. LEAP uses a proprietary algorithm to create the initial session key.a proprietary algorithm to create the initial session key.17.2.4 Authentication and Encryption Now that you understand some of the common methods for authenticating users, it's time to start looking at some encryption methods. This chapter begins with an introduction to WEP. the problem with WEP is that it can be easily cracked. As a result, a number of other methods have emerged to improve the strength of encryption. Wi-FiProtectedAccess (WPA) and Wi-FiProtectedAccess2O are described below.1. WPA OverviewWPA was proposed by the Wi-Fi Alliance in 2003 as an alternative to WEP. WPA uses TemporalKeyIntegrityProtocol (TKIP) to change keys automatically. TKIP still uses RC4, but with an improved way of working. This is a major improvement over static WEP. WPA can optionally support the Advanced Encryption Standard (AES), but it is not mandatory.WPA is based on the 802.11i draft, version 3. WEP uses the very weak RC4 encryption technique. A better alternative is to use AES encryption, but this requires an upgrade of the device. To avoid equipment upgrades, WPA was developed to use TKIP and a larger IV than WEP, which makes passwords less easy to guess and does not require new hardware. Instead, only firmware upgrades can be performed in most cases.WPA provides two authentication modes.Enterprise mode: Enterprise mode WPA requires an authentication server. RADIUS is used for authentication and key distribution, and TKIP can also be used with the AES option available.