Protected Extensible Authentication Protocol (PEAP) uses Transport Layer Security (TLS) to create an encrypted channel between an authenticating PEAP client, such as a wireless laptop, and a PEAP authenticator, such as a server running the Remote Authentication Dial-In User Service (RADIUS). PEAP does not specify an authentication method but provides additional security for other extensible authentication protocols (EAP) that might not provide strong security on their own, such as EAP-MSCHAPv2 for password-based authentication, by effectively creating a secure tunnel for its transmission. This makes it suitable for the scenario where the company requires both certificate-based and secure password-based authentications. EAP-TLS, on the other hand, requires certificates on both the client and server sides, which could be considered as more secure but is also more costly and complex to implement. EAP-TTLS allows for client-side authentication using a variety of methods, but it's not as commonly used as PEAP.