PA Default Behaviour for un-matched UDP traffic?

[TranceforLife]

Correct, but PA will classify the traffic not as "unknown-udp" as an application. It will be a simple traffic drop. As traffic trying access from outside to inside without any session match. 

[Fatema]

Alrighty, PA should document it somewhere those corner cases, as it becomes difficult for new bees, like me to understand the default PA behavior (or it can be just common sense, that I could be missing :) )

Thank you TraceforLife and Brad for quick responses and explanations.

Appreciate it!

[reaper]

here's some documentation :) Pro-Tips: Unknown Applications