What statement is true regarding traditional data security perimeter firewalls?

Traditional data security perimeter firewalls are primarily designed to control and filter traffic based on port and protocol. While they excel at monitoring and filtering packets, they are often limited in their ability to inspect traffic beyond basic port and protocol evaluation. This means that they may not effectively evaluate or analyze the contents of the data being transmitted through specific ports, especially when compared to more advanced solutions. As a result, they have a constraint related to their visibility over various ports, which can impact how well they detect potential threats that operate over non-standard or multiple ports.

In contrast, the other statements typically do not accurately reflect the capabilities of traditional firewalls. For example, while firewalls can monitor some encrypted applications, they may struggle with fully decrypting and inspecting encrypted traffic. Similarly, prioritizing application-level filtering is more characteristic of advanced firewalls, like next-generation firewalls (NGFWs), rather than traditional firewalls, which primarily focus on port and protocol filtering.