Azure Application Gateway: Master Your Cloud Networking Interview

This video provides a comprehensive overview of Azure Application Gateway, a web traffic load balancer operating at Layer 7 of the OSI model (0:11, 0:37). It covers 17 key interview questions related to its features and functionalities. The video highlights the following aspects of Azure Application Gateway: Core Functionality: It acts as a load balancer that distributes web traffic efficiently, enhances security, and provides advanced routing capabilities for web applications (0:11-0:34). Key Features: Web Application Firewall (WAF): Inspects incoming traffic to protect against malicious activities like SQL injection and cross-site scripting (XSS) (0:56-1:16, 5:52-6:06). SSL Termination: Decrypts HTTPS traffic before forwarding it to backend servers, reducing their processing burden and enabling traffic inspection (1:19-1:39). URL-based Routing: Directs client requests to specific backend servers based on the requested URL (1:40-2:00). Session Affinity (Cookie-based Affinity): Ensures a user's requests are consistently routed to the same backend server during a session (2:02-2:23). Health Monitoring: Continuously checks the status of backend servers and reroutes traffic to healthy instances if needed (2:25-2:42). Autoscaling: Dynamically adjusts the number of instances based on real-time traffic demand, ensuring optimal performance and cost efficiency (4:29-4:44). Comparison with Traditional Load Balancers: Unlike traditional Layer 4 load balancers, Application Gateway provides advanced routing capabilities and enhanced security features, making it ideal for modern web applications (3:42-4:04). Communication with Backend Servers: It typically communicates with backend servers using HTTP or HTTPS, with HTTPS preferred for end-to-end encryption (4:47-5:04). Common Use Case: Primarily used to manage and distribute traffic for web applications, ensuring high availability, secure access, and efficient request routing (5:08-5:23). Header-based Routing: Allows routing decisions based on HTTP headers for more granular traffic control (5:26-5:43).