A network firewall acts as a gatekeeper between a trusted internal network and an untrusted external network (such as the internet). It examines incoming and outgoing packets against a set of predefined security rules, allowing traffic that meets the rules and blocking traffic that does not. This controls access to internal resources and prevents unauthorized or potentially malicious communications.
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What is a data packet and why is it important for a firewall?
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What are predefined security rules and how are they configured?
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What distinguishes a network firewall from other types of firewalls?