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<>一、简介
①IP地址即IP协议是为计算机网络相互连接相互通信而设计的协议。
②IP地址分为网络部分和主机部分
③IP地址是由个二进制位组成,通常用点分使进制显示
<>二、分类
IP地址简单分为5类,即:
A类:第一个字节第一位固定为0,第一个字节为网络地址,第二、三、四节为主机位
B类:第一个字节前两位固定为10,第一、二个字节为网络地址,第三、四节为主机位
C类:第一个字节前两位固定为110,第一、二、三个字节为网络地址,第四节为主机位
D类:第一个字节前两位固定为1110,D类地址不分网络地址和主机位
E类:第一个字节前两位固定为1111,E类地址不分网络地址和主机位
A、B、C类常见, D类、E类不常用。
但有些IP属于私有IP,需要记住,具体如下:
<>三、子网掩码
子网掩码:又称“网络掩码”、“地址掩码”是一种用来指明一个IP地址的哪些位标识的是主机所在的网络地址与主机地址的位掩码。通常情况下,子网掩码和地址本身的表示方法是一样的。在IPv4中,就是点分十进制四组表示法或表示为一个八位十六进制数,后者用得较少。子网掩码不能单独存在,它必须结合IP地址一起使用。
<>四、地址规划
<>五、IP数据包格式
<>六、课外练习