COMPUTER NETWORKING

Detailed explanation-1: -(A circuit proxy filter firewall operates at the session layer. It verifies the sequencing of session packets, breaks the connections, and acts as a proxy between the server and the client. An application layer firewall operates at the application layer, examines the entire message, and can act as a proxy to clients.

Detailed explanation-2: -A proxy firewall is a network security system that protects network resources by filtering messages at the application layer. A proxy firewall is also be called an application firewall or gateway firewall. A proxy firewall is also a proxy server, but not all proxy servers are proxy firewalls.

Detailed explanation-3: -A circuit-filtering firewall (also called a circuit-level gateway) works at the transport and session layers of the OSI model. It can examine the TCP handshake information that is sent between computers to verify that a session request is legitimate.

Detailed explanation-4: -A proxy server is an intermediary that acts as a gateway between a user’s device and the public internet. A packet filtering firewall is a piece of software that prevents unauthorized access.

Detailed explanation-5: -Proxy firewalls monitor network traffic for core internet protocols, such as Layer 7 protocols, and must be run against every type of application it supports. These include Domain Name System (DNS), FTP, HTTP, Internet Control Message Protocol (ICMP), and Simple Mail Transfer Protocol (SMTP).