What describes the processing order of traffic rules in access control lists?

The processing order of traffic rules in access control lists (ACLs) follows a top-down order. This means that when a packet is evaluated against the rules in an ACL, the system checks the conditions from the first rule at the top of the list down to the last rule at the bottom. The first rule that matches the packet's characteristics determines the action to be taken, whether it is to allow or deny the traffic. This hierarchy is crucial for efficient packet filtering, as it helps minimize the amount of processing needed by stopping further evaluations once a match is found.

If a rule is placed higher in the list, it will be evaluated first, which is critical in scenarios where specific traffic needs to be matched or handled before broader rules come into play. This method of evaluation ensures that the most specific conditions are checked first, allowing for a more controlled and precise handling of network traffic. Understanding this processing order is essential for configuring ACLs effectively.