Firewalls
Network security devices filtering traffic based on rules to protect networks from unauthorized access. Firewalls implement access control policies.
Real World
Schools use firewalls to block students from accessing social media sites during lessons by creating rules that deny traffic to specific domain names and port numbers on the school network.
Exam Focus
Distinguish packet filtering, stateful inspection, and application-level firewalls — examiners expect you to name and compare types.
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