Shadowed Rules
A network policy with shadowed rules is one in which at least one rule in the policy will never trigger because a rule that precedes it prevents the packet from being evaluated by the shadowed rule.
For example, consider these network objects and network rules in the "example" network policy:
object network 02-50
range 10.10.10.2 10.10.10.50
object network 02-100
range 10.10.10.2 10.10.10.100
access-list example extended deny ip any4 object 02-50
access-list example extended permit ip host 10.10.10.35 object 02-50
access-list example extended permit ip any4 object 02-100
No traffic is evaluated by this rule,
access-list example extended permit ip host 10.10.10.35 object 02-50
because the previous rule,
access-list example extended deny ip any4 object 02-50
denies any ipv4 address from reaching any address in the range 10.10.10.2 - 10.10.10.50.