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Negated Addresses

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Hi

I'm confused about destination-address-excluded and source-address-excluded. I tyr to read an example following these link "https://www.juniper.net/documentation/en_US/junos/topics/example/security-policy-negated-address-configuring.html" but I don't understand 

 

If I have a three address books, It's

address a1 10.10.10.0/24

address a2 20.20.20.0/24

address a3 30.30.30.0/24

 

And security policies is below

set security policies from-zone trust to-zone untrust {
policy p1 {
   match {
   source-address a1;
   destination-address a2;
   source-address-excluded;
   destination-address-excluded;
   application any;
   }
then {
permit;
 
According to my understanding, all source and destination addess excluded  10.10.10.0/24 and 20.20.20.0/24. Traffic will be permitted on firewall.  Example, traffic from 30.30.30.0/24 destined to 10.10.10.0/24, It will be permitted. Am i correct?
 
What's about "source-address-excluded a1". What's different 
 
Thank you 

 


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