【单选题】【消耗次数：1】
用TCP／IP协议的网络在传输信息时，如果出了错误需要报告，采用的协议是（）。
①
ICMP
②
HTTP
③
TCP
④
SMTP
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TCP是面向连接的协议
②
UDP是非面向连接的协议
③
ARP是完成物理地址到IP地址的转换
④
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