In a Defense in Depth model, which layer is responsible for application-level firewall protections?

In a Defense in Depth model, the application layer is specifically responsible for application-level firewall protections. This layer focuses on securing the software applications that users interact with, ensuring that they are protected from vulnerabilities and threats that could exploit them. Application-level firewalls operate at a level that inspects the data being sent and received by applications, allowing them to block malicious requests or traffic aimed at exploiting application vulnerabilities.

This approach is crucial because traditional firewalls might not effectively filter out threats that specifically target application-level weaknesses, such as web applications or API endpoints. By placing firewalls within the application layer, organizations can add an additional layer of protection that is tailored to the unique security needs of the applications they deploy.

The other layers, such as data, host, and perimeter, have different roles and focus areas within the Defense in Depth strategy. While they contribute to overall security, they do not specifically deal with application-level firewall protections. Therefore, the application layer is the most appropriate choice for this question.