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

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

单项选择题WhichofthefollowingClassAnetworksisreservedfor privatenetworks useonly？（）

A.network 10.0.0.0
B.network 127.0.0.0
C.network 129.135.0.0
D.network 192.168.0.0