सागर साळवी on Instagram: "📘 Palo Alto Firewall – Beginner Content 1. Introduction to Palo Alto Firewall Palo Alto Networks is a Next-Generation Firewall (NGFW). Works on Layer 3, Layer 4, and Layer 7. Provides advanced security features like: Application Identification (App-ID) User Identification (User-ID) Content Inspection (Content-ID) Threat Prevention (Antivirus, Anti-Spyware, URL Filtering, IPS/IDS) 2. Firewall Modes L2 Mode (Switching) → Works like a switch, doesn’t route. L3 Mode (Routi