When is the content inspection performed in the packet flow process?
When is the content inspection performed in the packet flow process?
Content inspection is typically performed before the packet forwarding process. This ensures that the content of the packets is inspected for threats and policy violations before the packets are forwarded to their destination. This step is crucial to maintain security and is logically placed towards the end of the packet flow process.
I'm thinking C. Here's my train of thought, let me know what you think. B and D are certainly not right. A and C could be both technically true, but which is more accurate? A indicates that "after app has been identified", so we can interpret that in the Flow Diagram as the step in App-ID which says "Pattern based application identification" however, considering the Packet Flow Sequence, after the app is identified, there are still several steps that don't lead directly to Content ID. First it checks for policy matches that will allow it (so it might still get dropped). Then it will check if there are any Security Profiles (ContentID) that will be applicable. QoS and SSL Decryption also might occur at this point. My point is there's a whole bunch of stuff still going on between the "app being identified" and content inspection. My conclusion is that whenever content inspection is performed it's always before packet forwarding. And it is not always the case that it happens immediatly after the app has been identified.
agree. besides, if app is not identified, when it arrives to content inspection it just will not be inspected. so since apps are NOT always identified A cant be. however, both App ID and Content ID ALWAYS happen before packet forwarding process
Content inspection isn't always done (e.g. Application Override), but if it is then it either returns 'detection' and security policy is referenced again or 'no detection' and then traffic is re-encrypted (if SSL decrypted), and THEN the packet is forwarded. So since C isn't always true, I feel like A is the correct answer. I can definitely see how a similar argument can be made for C though, so I agree that both are almost equally correct.
I feel like this question could be simply asked as "When do you learn to read?" A: After you are done being a toddler C: Sometime before you die of old age Technically both are correct. Seriously Palo? Are we supposed to play the choose the more correct answer game? C feels like the broader safer answer. If the Application is Incomplete or Insufficient Data and can't be identified, that doesn't stop Palo from attempting content inspection so it would make A questionable.
Agree A: https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClVHCA0 SECTION 5: APPLICATION IDENTIFICATION (APP - ID) SECTION 6: CONTENT INSPECTION SECTION 7: FORWARDING/EGRESS
The content inspection is performed ONLY if application is identified. If it's an unknown app then the content inspection doesn't happen but the packet it's forwarded, if the security policy allow.
A is correct "The firewall first performs an application-override policy lookup to see if there is a rule match. If there is, the application is known and content inspection is skipped for this session . If there is no application-override rule, then application signatures are used to identify the application. The firewall uses protocol decoding in the content inspection stage to determine if an application changes from one application to another ."
Agree A: https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClVHCA0 SECTION 5: APPLICATION IDENTIFICATION (APP - ID) SECTION 6: CONTENT INSPECTION SECTION 7: FORWARDING/EGRESS
Can find the answer here, which is the same as Question 65. https://live.paloaltonetworks.com//t5/image/serverpage/image-id/12862i950F549C7D4E6309
C is correct
after app identification there is a return to the previous step before content inspection, recheck the diagram
So this analysis makes both A and C right. Content inspection happens "after the application has been identified" but "before the packet forwarding process". LOL.
A. could be correct if the wording is "after identifying application" but it's not necessarily have to be successfully identified. C. is more likely.
Outside of this flow diagram I couldn't find anything concrete in any docs. Based on the flow diagram you can see there is a question "Session App Identified?", if the answer is "No" then it is sent to the App-ID process before being sent back to the FW Fastpath process. If Content Inspection is applicable then the packet is sent onward to that process.https://live.paloaltonetworks.com//t5/image/serverpage/image-id/12862i950F549C7D4E6309
I'm going to have to go with option C here. A and D both are technically correct. However, A and D are both not neccessary steps in the process. C is a neccessary step. This is one of those "which is the better answer" scenarios.
Answer: A
My two cents. It's C. Scroll down to section 6, Content Inspection, happens right before Forwarding/Egress. https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClVHCA0
A. after the application has been identified Content inspection is typically performed after the application has been identified in the packet flow process of many firewall systems, including Palo Alto Networks firewalls. This allows for the content of the packets to be inspected for threats and policy violations based on the identified application.
According to this Before the packet forwarding is "closer" https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClVHCA0
C is not possible because there are several options before packet forwarding, content inspection is one of them. content inspection only happens if the traffic has gone through the app-id engine
Content inspection occurred after the session app identified. If app not identified, it would be app override policy match >> pattern based app identification >> security policy lookup based on app >> Rule match with action allowed >> Content inspection