![]() ![]() Link layer protection secures wireless data only where it is most vulnerable, at the wireless link level and is characterized and allows higher-level protocols, such as IP, IPX, etc., to pass securely by providing security for ALL upper layer protocols. In a wireless network, link layer protection starts with an authentication service and includes link layer encryption and integrity services. It provides secure frame transmissions by automating critical security operations including user authentication, frame encryption, and data integrity verification. Link layer security provides point-to-point security between directly connected network devices. Link Layer Security with Wi-Fi Protected Access (WPA) Integrity is ensuring that packets have not been tampered with en route, even though they may have originated from a legitimate network device. Authentication/Integrity- Authentication, in this case, verifies that devices (rather than users) are legitimate and that data packets originate from the source they claim to and have not been "spoofed" by a rogue network device using stolen credentials.Encryption can be carried out at Layer 2 through 802.1X using secure key exchange, or at Layer 3 through the use of Virtual Private Networks (VPNs). Network transmissions are susceptible to casual browsing if the data packets aren't encrypted (encoded) so that the data is unintelligible to eavesdroppers. Privacy hides information from those who shouldn't have it. ![]() Once it is determined that users belong on the network, authorization may occur to determine what services they can have. ![]() Access control can occur through any number of user authentication methods designed to verify that a user is who they claim to be and that they have network privileges.
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