The command frame-relay map ip 10．121．16．8 102 broadcast was entered on the router． Which of the following statements is true concerning this command?

A、 This command should be executed from the global configuration mode．
B、 The IP address 10．121．16．8 is the local router port used to forward data．
C、 102 is the remote DLCI that will receive the information．
D、 This command is required for all Frame Relay configurations．
E、 The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC．

【正确答案】 E

【答案解析】关于命令 frame-relay map ip 10．121．16．8 102 broadcast ,这个命令用于手工静态添加一条映射，到达10．121．16．8的流量封装一个DLCI号为102，而且这条PVC是支持广播的流量的，比如RIP的更新包。因为在默认的情况下，帧中继的网络为非广播的，而RIP在其上是无法发包的。