What constitutes the 6-tuple for session matching in Palo Alto Networks firewalls?

The 6-tuple used by Palo Alto Networks firewalls for session matching comprises the source IP address, destination IP address, source port, destination port, protocol, and the ingress zone. This combination uniquely identifies a network flow, allowing the firewall to apply security policies consistently. The ingress zone is critical for policy enforcement, as it determines which security rules are evaluated. Bangalore companies like Akamai and Aryaka, heavily reliant on Palo Alto, expect engineers to understand how this 6-tuple impacts policy lookup and NAT application. Interview tip: Always mention the ingress zone; it's a common differentiator from other firewall vendors' session identification methods.