Question 134 - PCNSE discussion

Option A is correct because setting "Reject Non-syn-TCP" to No and "Asymmetric Path" to Bypass in the Zone Protection profile disables the TCP checks that can cause the firewall to drop packets due to asymmetric routing. This allows the firewall to accept non-SYN TCP packets without a session match and packets that are out of sequence or out of window.Option D is correct because setting session tcp-reject-non-syn to no in the CLI also disables the TCP checks that can cause the firewall to drop packets due to asymmetric routing. This allows the firewall to accept non-SYN TCP packets without a session match and packets that are out of sequence or out of window.Option B is incorrect because setting session tcp-reject-non-syn to no in the CLI has the same effect as setting "Reject Non-syn-TCP" to No in the Zone Protection profile, so there is no need to do both.Also, setting "Asymmetric Path" to Global in the Zone Protection profile does not disable the TCP checks that can cause the firewall to drop packets due to asymmetric routing. It only allows the firewall to use a global timer for asymmetric path detection instead of a per-session timer.Option C is incorrect because setting "Reject Non-syn-TCP" to Global and "Asymmetric Path" to Global in the Zone Protection profile does not disable the TCP checks that can cause the firewall to drop packets due to asymmetric routing. It only allows the firewall to use a global timer for both non- SYN TCP rejection and asymmetric path detection instead of a per-session timer.Reference: 1 https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClReCAK 2 https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClSHCA0