{
  "@context": "https://schema.org",
  "@type": "TechArticle",
  "@id": "https://anchorfact.org/kb/kb-2026-00121",
  "headline": "Firewall",
  "description": "A firewall is a network security system that monitors and controls incoming/outgoing traffic based on predetermined rules. Types: packet filtering (stateless, layer 3/4), stateful inspection (tracks connection state), application-layer (WAF, layer 7), next-generation (NGFW, combines all).",
  "dateCreated": "2026-05-22T14:59:47.582Z",
  "dateModified": "2026-05-22T14:59:47.582Z",
  "author": {
    "@type": "Organization",
    "name": "AnchorFact"
  },
  "publisher": {
    "@type": "Organization",
    "name": "AnchorFact",
    "url": "https://anchorfact.org"
  },
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "anchorfact:confidence": "high",
  "anchorfact:generationMethod": "human_only",
  "citation": []
}