In TCP/IP stack,RARP does which one of the following?

题目

In TCP/IP stack,RARP does which one of the following?
A：Maps logical addresses to physical addresses using unicasts
B：Maps physical addresses to logical addresses using broadcasts
C：Maps ARP table entries to router ports
D：Maps logical addresses to physical addresses using broadcasts
E：Maps physical addresses to logical addresses using unicasts

答案

B.
RARP 反向地址转换协议就是将局域网中某个主机的物理地址转换为IP地址,比如局域网中有一台主机只知道物理地址而不知道IP地址,那么可以通过RARP协议发出征求自身IP地址的广播请求,然后由RARP服务器负责回答.RARP协议广泛用于获取无盘工作站的IP地址.