单选题What kind of message does a PING send out to test connectivity?（）AICMP echo requestBInformation interrupt requestCTimestamp replyDSource quenchENone of the above
单选题
What kind of message does a PING send out to test connectivity?（）
A
ICMP echo request
B
Information interrupt request
C
Timestamp reply
D
Source quench
E
None of the above
参考解析
解析：
暂无解析
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