{"type":"rich","height":"190","provider_name":"Hatena Blog","categories":["A to Z Information Security","\u6c17\u306b\u306a\u308b\u60c5\u5831\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u7528\u8a9e","\u6587\u5b66\u30fb\u8a9e\u5b66","\u30b5\u30fc\u30d0\u30fc\u3068\u30cd\u30c3\u30c8\u30ef\u30fc\u30af"],"published":"2026-02-11 08:00:00","provider_url":"https://hatena.blog","url":"https://www.three-wise-monkeys.com/entry/2026/02/11/080000","blog_url":"https://www.three-wise-monkeys.com/","version":"1.0","author_url":"https://blog.hatena.ne.jp/slowtrain2013/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.three-wise-monkeys.com%2Fentry%2F2026%2F02%2F11%2F080000\" title=\"Firewall\uff08\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\uff09\uff1aA to Z Information Security - \u53e1\u667a\u306e\u4e09\u733f\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","width":"100%","description":"Firewall: A Guard at the Gate A firewall is like a security guard that stands at your computer's door and decides who can come in and who must stay out! What is a firewall? Imagine your house has a front gate with a security guard. The guard checks everyone who wants to come in: \"Are you a friend? C\u2026","blog_title":"\u53e1\u667a\u306e\u4e09\u733f","title":"Firewall\uff08\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\uff09\uff1aA to Z Information Security","author_name":"slowtrain2013","image_url":"https://cdn-ak.f.st-hatena.com/images/fotolife/s/slowtrain2013/20251109/20251109123654.png"}