問題文
An SRX Series Firewall steers traffic by application, and one of the steps of that work is a lookup in the cache that holds what the device has already learned about applications. An engineer asks what that lookup brings back for a rule to be matched against. What does it bring back?
選択肢
- The kind of the application on its own, since the rest of what a rule needs is read from the header of the packet that is in hand, taken just as it stands, and never from the cache that holds what the device has learned.
- The kind of the application together with the address of the near end, the port of the near end, the zone that the traffic came from and the instance that was chosen last time, since a rule is matched against the earlier reading of the side that opened the session.
- The kind of the application together with the count of packets seen so far, the age of the entry, the confidence of the guess and the rule that matched before, since a rule is matched against how firm the earlier reading was.
- The kind of the application together with the address of the far end and the port of that far end, the kind of the protocol, and the named service that go along with it, since a rule is matched against the whole of that one set and not against the name of it on its own.