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單項選擇題

Below is the routing table for host "earth"：

If host "earth" tries to ping 128.78.1.5， to which of the following interfaces is the packet being sent？（）

A.en0
B.lo0
C.tr0
D.ping results in "Sendto：Network is unreachable" message

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單項選擇題

In a TCP/IP network， which of the following commands utilizes the ICMP protocol？（）

A.rcp
B.tftp
C.ping
D.rpcinfo

單項選擇題

An adapter state does not show available after a reboot. Which of the following is the most probable cause？（）

A.DNS is not working properly
B.Ping is not working properly
C.The cables are disconnected
D.The device driver did not load properly