What is the syntax used to configure a Junos OS firewall filter?

The syntax used to configure a Junos OS firewall filter involves the use of the keywords "from" and "then." In Junos OS, firewall filters are configured in a structured manner that allows you to define specific conditions and actions that should occur when those conditions are met.

When you specify "from," you outline the criteria that packets must match in order to trigger the filter. This may include parameters like source or destination addresses, protocols, or port numbers. The "then" part of the syntax is where you define what action to take when the specified conditions are matched, such as accepting, rejecting, or counting the packets.

This clear separation of defining conditions and actions is essential in the design of Junos, as it maintains an organized and logical flow in the configuration process, making it easier for network administrators to implement and manage their firewall policies effectively.

The other options do not represent the correct terminology or sequence used in Junos OS configuration for firewall filters.