IPv6地址长度为()bit。
- A.32
- B.64
- C.128
- D.256
正确答案及解析
正确答案
解析
与IPV4相比,IPV6具有以下几个优势:
(1)IPv6具有更大的地址空间。IPv4中规定IP地址长度为32,即有232-1个地址;而IPv6中IP地址的长度为128,即有2128-1个地址。
(2)IPv6使用更小的路由表。IPv6的地址分配一开始就遵循聚类的原则,这使得路由器能在路由表中用一条记录(Entry)表示一片子网,大大减小了路由器中路由表的长度,提高了路由器转发数据包的速度。
(3)IPv6增加了增强的组播(Multicast)支持以及对流的支持,这使得网络上的多媒体应用有了长足发展的机会,为服务质量(QoS,Quality of Service)控制提供了良好的网络平台。
(4)IPv6加入了对自动配置的支持。这是对DHCP协议的改进和扩展,使得网络(尤其是局域网)的管理更加方便和快捷。
(5)IPv6具有更高的安全性。在使用IPv6网络中用户可以对网络层的数据进行加密并对IP报文进行校验,极大的增强了网络的安全性。
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