What is a Proxy firewall?

• The most secure type of firewall is a proxy firewall, which protects network resources by filtering communications at the application layer. A proxy firewall, also known as an application firewall or a gateway firewall, restricts the kind of applications that can run on a network, improving security but compromising functionality and speed.
  
• Because it prohibits networks from directly connecting other systems, a proxy firewall is considered the most secure type of firewall. It has its own Internet Protocol (IP) address, which implies packets cannot be received directly from the network via an external network connection.

Read More: Which layers are referred to as network support layers?