https://blog.gongquiz.com/2023/12/12/tcp-ip-%ed%94%84%eb%a1%9c%ed%86%a0%ec%bd%9c%ec%97%90-%eb%8c%80%ed%95%9c-%ec%84%a4%eb%aa%85%ec%9c%bc%eb%a1%9c-%ec%98%b3%ec%9d%80-%ea%b2%83%ec%9d%80-%ec%9b%b9%eb%94%94%ec%9e%90%ec%9d%b8%ea%b8%b0/