2014-55、在IPV4中，A类地址在未划分子网情况下，用______位地址来标识网络中一台主机。
- A.8
- B.16
- C.24
- D.32
正确答案及解析
正确答案
解析
本题考查IP地址基础知识。 IPV4采用4个字节(32位)数字表示IP地址，每个IP地址包括两个标识码(ID)，即网络ID和主机ID。同一个物理网络上所有主机都使用同一个网络ID，网络上一个节点都有一个主机ID与其对应。共有5种IP地址类型以适合不同容量网络，即A类～E类。 其中A、B、C3类(如下表格)统一分配，D、E类为特殊地址。
①A类IP地址 一个A类IP地址是指在IP地址四段号码中，第一段号码为网络号码，剩下三段号码为本地计算机号码。如果用二进制表示IP地址话，A类IP地址就由1字节网络地址和3字节主机地址组成，网络地址最高位必须是“0”。A类IP地址中网络标识长度为8位，主机标识长度为24位，A类网络地址数量较少，有126个网络，每个网络可以容纳主机数达1600多万台。 ②B类IP地址 一个B类IP地址是指在IP地址四段号码中，前两段号码为网络号码。如果用二进制表示IP地址话，B类IP地址就由2字节网络地址和2字节主机地址组成，网络地址最高位必须是“10”。B类IP地址中网络标识长度为16位，主机标识长度为16位，B类网络地址适用于中等规模网络，有16384个网络，每个网络所能容纳计算机数为6万多台。 ③C类IP地址 一个C类IP地址是指在IP地址四段号码中，前三段号码为网络号码，剩下一段号码为本地计算机号码。如果用二进制表示IP地址话，C类IP地址就由3字节网络地址和1字节主机地址组成，网络地址最高位必须是“110”。C类IP地址中网络标识长度为24位，主机标识长度为8位，C类网络地址数量较多，有209万余个网络。适用于小规模局域网络，每个网络最多只能包含254台计算机。
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