CCNA题，帮我讲解，为什么选D啊HowisanEUI-64formatinterfaceIDcreatedfroma48-bitMACaddress?A.byappending0xFFtotheMACaddressB.byprefixingtheMACaddresswith0xFFEEC.byprefixingtheMACaddresswith0xFFandappending

Question

CCNA题，帮我讲解，为什么选D啊
How is an EUI-64 format interface ID created from a 48-bit MAC address?
A. by appending 0xFF to the MAC address
B. by prefixing the MAC address with 0xFFEE
C. by prefixing the MAC address with 0xFF and appending 0xFF to it
D. by inserting 0xFFFE between the upper three bytes and the lower three bytes of the MAC address
E. by prefixing the MAC address with 0xF and inserting 0xFafter each of its first three bytes

Answer 1

这就是规定啊
就好像1+1=2一样
这么做的目的是为了让MAC地址对应到一个ipv6地址，因为mac地址是唯一的，ipv6地址也是唯一的，但是mac只有8B，而ipv6有16B，所以需要补
EUI-64标准规定了在mac地址中间加FFFE