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PING命令使用了哪种ICMP消息？（）
- A、Redirect
- B、Source quench
- C、Echo request和Echo reply
- D、Destination unreachable
参考答案
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单选题PING命令使用了哪种ICMP消息（）。A
RedirectB
Source quenchC
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单选题PING命令使用了哪种ICMP？正确的选项是？（）。A
Redirect；B
Source quench；C
Echoreply；D
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