The single point of entry and exit for the network is this form of device, which is technically a proxy firewall but is also referred to as an application-level gateway. It filters packets based on various factors, such as the HTTP request string and the service for which they are meant, as indicated by the destination port. Although gateways that filter at the application layer offer significant data protection, they can significantly slow down a network and be challenging to administer. For the best protection against threats from web applications, employ proxy firewalls. They can restrict access to dangerous websites and stop the firewall from leaking sensitive data. However, they could cause a lag in communication.