单项选择题
In a TCP/IP network， which of the following commands utilizes the ICMP protocol？（）
A.rcp
B.tftp
C.ping
D.rpcinfo
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Anadapterstatedoesnotshowavailableafterareboot.Whichofthefollowingisthemostprobablecause？（）
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 -
单项选择题
Ahostistobepartofaverysmallprivatenetwork，whichwillneverbeconnectedtoanyothernetworks.Whichofthefollowingnameresolutionschemeswouldbetheeasiesttoimplement？（）
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Theinternetaddress198.102.27.120representswhichofthefollowingaddresses？（）
A.Class A
B.Class B
C.Class C
D.Class D
