Question 1 – How many deployment models are available in Palo Alto Networks firewalls? Answer – There are multiple deployment models available: Tap Mode This interface type is used to connect the firewall to a switch’s SPAN (Switched Port Analyzer) or mirror port. It passively collects and logs traffic to the firewall’s traffic log without impacting live traffic. Layer 2 Mode - In this mode, the firewall acts like a switch. All connected interfaces are in the same subnet, allowing seamless communication within that subnet. Layer 3 Mode- Each interface is assigned to a different subnet, and the firewall functions as a router. It supports static and dynamic routing protocols. Virtual Wire (V-Wire) Mode- This mode allows the firewall to inspect traffic transparently, without requiring IP or MAC addresses on the interfaces. It essentially acts as a Layer 1 bridge between two network segments. For more Palo Alto interview questions and answers, visit: https://Techclick.in Question 2 – How many Ethernet (physical) and logical interfaces are available in Palo Alto firewalls? Answer: Physical Interfaces (used in various modes) Tap Mode Virtual Wire Mode Layer 2 Mode Layer 3 Mode Aggregate Interfaces (combining multiple physical interfaces for increased bandwidth or redundancy) High Availability (HA) (for failover setups) Logical Interfaces VLAN Interfaces – For Layer 2 VLANs Loopback Interfaces – For management or routing use cases Tunnel Interfaces – Used for VPN tunnels Decrypt Mirror Interfaces – Used to mirror decrypted traffic for inspection