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<>一、IP地址的表示:
* 一个IPv4地址有32位二进制组成 (32位二进制有4个字节;1字节=8bit位)
* IPv4地址通常采用“点分十进制”表示
IPv4地址范围:0.0.0.0~255.255.255.255 (约有43亿)
<>二、IP地址的构成:
* 由 主机位 + 网络位 构成
网络掩码:用于区分一个IP地址的网络部分和主机部分
<>三、IP地址的分类:
*
IP地址根据网络ID的不同分为A、B、C、D、E五类,其中A、B、C这三类是比较常用的IP地址D、E类为特殊地址。
实际可用的IP地址范围:
A类:1.0.0.0 ~ 126.255.255.255 网络掩码:255.0.0.0
B类:128.0.0.0 ~ 191.255.255.255 网络掩码:255.255.0.0
C类:192.0.0.0 ~ 223.255.255.255 网络掩码:255.255.255.0
D类:224.0.0.0 ~ 239.255.255.255(组播地址)
E类:240.0.0.0 ~ 254.255.255.255(实验目的)
A、B、C 类 —— 单播IP地址 、可以配置PC、网络设备、接口
*
公有地址 —— 互联网上设备拥有的唯一地址
*
私有IP地址 —— 不直接用于互联网,通常在局域网中使用
特殊的无法使用的IP地址:
* 无效地址:0.X.X.X;0.0.0.0(所有网络)
* 本地测试地址(环回):127.X.X.X;
* 广播地址:255.255.255.255;
* 定向广播地址:主机位全1的地址;192.168.1.255/24;
* 本地链路地址:169.254.0.0/16;
* 网段:
* 主机位全0的地址;1.1.1.0/24;X.X.X.0/24、X.X.0.0/16;
* 在任意一个网段中,主机位全1或全0的IP均不能使用;