FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Application-layer proxy firewalls operate up to Layer 7. Unlike packet filter and stateful firewalls that make decisions based on layers 3 and 4 only, application-layer proxies can make filtering decisions based on application-layer data, such as HTTP traffic, in addition to layers 3 and 4.

Detailed explanation-2: -The layer 7 load-balancer acts as a proxy, which means it maintains two TCP connections: one with the client and one with the server. The packets are re-assembled then the load-balancer can take a routing decision based on information it can find in the application requests or responses.

Detailed explanation-3: -Layer 7 of the OSI model, or the application layer, supports communications for end-user processes and applications, and the presentation of data for user-facing software applications.

Detailed explanation-4: -Layer 7 of The OSI Model: Application Layer is the OSI layer closest to the end user, which means that both the OSI application layer and the user interact directly with the software application. This layer interacts with software applications that implement a communicating component.

Detailed explanation-5: -Proxy firewalls filter traffic at the application layer, which is Layer 7 of the Open Systems Interconnection model. The technology is similar to traditional packet filtering firewalls, but proxy firewalls add an extra level of protection.