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

单项选择题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？（）

A.DNS
B.NIS
C.DHCP
D.etc/hosts file

单项选择题Theinternetaddress198.102.27.120representswhichofthefollowingaddresses？（）

A.Class A
B.Class B
C.Class C
D.Class D

单项选择题Whichofthefollowingadaptersshouldbeconnectedtocoaxialcablingwithouttheuseofmediaconverters？（）

A.Adapter with AUI connector
B.Adapter with BNC connector
C.Adapter with RJ-45 connector
D.Adapter with DB-25 connector

单项选择题Whichofthefollowingclassnetworksrepresentsapossibilityofbeingfurthersubnettedinto2subnetsof128hostspersubnet？（）

A.Class A
B.Class B
C.Class C
D.Class D