单选题Communication with a remote host has failed. Which command is LEAST helpful in isolating the failure?（）A ping RemoteHostName B ping RemoteHostIPaddr C nslookup RemoteHostName D ping lo0
单选题
Communication with a remote host has failed. Which command is LEAST helpful in isolating the failure?（）
A
ping RemoteHostName
B
ping RemoteHostIPaddr
C
nslookup RemoteHostName
D
ping lo0
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