On router R1， which three of the following protocols will be forwarded to a host specified by the "iphelper-address" interface configuration command if the configuration has not been modified by the"ip forward-protocol udp" global configuration command？（）
- A、BOOTP
- B、TFTP
- C、ARP
- D、DNS
- E、proxy-ARP
- F、FTP
- G、CDP
正确答案:A,B,D
答案解析:有
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