As you view the entries of an external dynamic
list, you can exclude up to 100 entries from the list. The ability
to exclude entries from an external dynamic list gives you the option
to enforce policy on some (but not all) of the entries in a list.
This is helpful if you cannot edit the contents of an external dynamic
list (such as the Palo Alto Networks High-Risk IP Addresses feed)
because it comes from a third-party source.