FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -A web application firewall (WAF) is a firewall that monitors, filters and blocks data packets as they travel to and from a website or web application. A WAF can be either network-based, host-based or cloud-based and is often deployed through a reverse proxy and placed in front of one or more websites or applications.

Detailed explanation-2: -A proxy server can also be used to hide user information or to connect to services that would be blocked. On the other hand, a proxy firewall inspects all network traffic to detect and protect against potential threats. It can also detect network intrusion and enforce security policies.

Detailed explanation-3: -While all proxy firewalls are proxy servers, not all proxy servers are proxy firewalls. They both serve as an intermediary between servers and clients. Each can cache web pages to reduce network congestion and both conceal information about the user from the server.

Detailed explanation-4: -Explanation: An application gateway firewall, also called a proxy firewall, filters information at Layers 3, 4, 5, and 7 of the OSI model. It uses a proxy server to connect to remote servers on behalf of clients.