网络地址
类图中的6大关系 https://blog.csdn.net/qq_46028493/article/details/116464833
关联和依赖的区别 https://blog.csdn.net/u014805066/article/details/70255036
用例图中include和extend的含义 https://blog.csdn.net/qq_45808700/article/details/126785009
子网掩码？
https://blog.csdn.net/zhangzhengyi03539/article/details/52433432
IP地址、子网掩码、网关、DNS之间的关系 - 技术分享
https://blog.csdn.net/kde_qt/article/details/125759143