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A firewall is a network security device or software application designed to monitor, filter, and control incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network and untrusted external networks, such as the internet, to prevent unauthorized access and protect data integrity. Firewalls are one of the fundamental components of information security, ensuring that only legitimate traffic is allowed while blocking malicious or suspicious activities. The primary function of a firewall is packet filtering, which involves examining each packet of data that passes through the network. Packet filters check source and destination IP addresses, port ______ _______ ______ _______ _______ _______ _________ __________ _______ _____ ___ _____.
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