SSL can be used for which of the following purposes in network communications?

SSL (Secure Sockets Layer) is a protocol designed to provide a secure channel between two devices operating over the internet or an internal network. Its primary functions include both encryption and authentication, making it a versatile tool for securing network communications.

Encryption is crucial as it ensures that data transferred between the client and server is protected from unauthorized access. By encrypting the information, SSL secures sensitive data, such as login credentials and financial details, from eavesdropping or interception by malicious actors during transmission.

Authentication is equally important as it verifies the identities of the parties involved in the communication. SSL utilizes digital certificates issued by trusted Certificate Authorities (CAs) to ensure that users connect to legitimate servers and not impostor sites. This reduces the risk of man-in-the-middle attacks, where an attacker could intercept or alter the communication between the two parties.

Both these functions work together seamlessly in SSL to create a secure environment for data transmission, which is why the answer identifying SSL as serving both encryption and authentication is correct.