In Prisma SD-WAN, security policy rules are evaluated in order. If
network traffic matches the first rule in a policy set, that rule is applied and
access is allowed, denied, or rejected. If traffic passing from the source zone
to the destination zone doesn’t match the first rule; it is evaluated against
the next rule in the policy set until a matching rule is applied.
You can change the order in which the security policy rules are evaluated by
specifying a numerical order value or by dragging and dropping the rule
definition to a new location in the graphical representation of the security
policy set as part of it. For example, to change the second rule in a policy to
be the first rule checked, you can change its policy set position.