Firewalls are used to control incoming and outgoing network traffic based on predetermined security rules, primarily by limiting traffic to only the necessary ports for an application.
Port Filtering: Firewalls can block or allow traffic based on port numbers, thus limiting exposure to only those ports required by the application, enhancing security.
Security: This helps to protect the application from unauthorized access and potential attacks by reducing the attack surface.
[Reference: Cisco DevNet Associate Certification Guide, Chapter on Security Fundamentals and Firewalls., ]
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