Which of the following is NOT typically a function of a firewall?

Firewalls serve key functions in network security, primarily focusing on controlling traffic and protecting networks from unauthorized access. One of the primary functions is monitoring incoming network traffic to analyze and filter it based on pre-defined security rules. They also prevent unauthorized access by blocking specific types of traffic that could potentially harm the network. Additionally, firewalls log activities on the network, which is essential for auditing and identifying suspicious behavior or security breaches.

However, encryption of data transmissions falls outside the typical functions of a firewall. While firewalls deal with the filtration and management of traffic, they do not inherently provide encryption services; encryption is usually handled by different layers of security protocols or dedicated encryption solutions. Thus, the process of encrypting data to secure it during transmission is not a role that a firewall typically plays.