多项选择题
Which of the following are valid public IPv4 addresses？（）
A.10.2.127.220/16
B.127.0.0.1/24
C.212.2.17.54/16
D.9.2.128.254/8
E.127.2.126.213/24
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Auserhasasmallnetworkoffourcomputersthattheywanttoconnecttoasinglecablemodem.Whichofthefollowingdeviceswouldallowtheusertodothis？（）
A.Four port switch
B.Four port wireless router
C.Four port WAP
D.Four port hub -
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Auserstatesthattheycannotaccessanetworkshareddrive.Thetechnicianhasverifiedthattheclientsnetworkcableisgood.TheIPaddressofthemachineis169.254.10.15.Whichofthefollowingisthecauseoftheproblem？（）
A.The WINS server is not resolving names properly.
B.The DNS server is not resolving names.
C.The DHCP server is out of IP address leases.
D.The hosts file is corrupted. -
单项选择题
EnsuringthatdataistransmittedsecurelyoveranIPnetworkisthemainpurposeof：（）
A.Telnet
B.FTP
C.SIP
D.TLS
