What does the "rule base" of a firewall define?

The correct answer highlights that the "rule base" of a firewall is a crucial component that comprises a list of rules that dictate how traffic is handled. This collection of rules specifies which types of traffic are permitted or denied, based on various criteria such as source and destination IP addresses, port numbers, and protocols used.

Each rule within the rule base is evaluated by the firewall when it processes incoming or outgoing traffic. The order of these rules is also significant, as the firewall typically checks them sequentially to determine the appropriate actions to take. A well-defined rule base enables effective traffic management and enforcement of security policies, ensuring that only authorized traffic is allowed and potential threats are blocked.

Understanding the function of the rule base is essential for anyone managing firewall security, as it directly impacts the firewall's effectiveness in protecting the network.