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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单项选择题

A user has a small network of four computers that they want to connect to a single cable modem. Which of the following devices would allow the user to do this？（）

A.Four port switch
B.Four port wireless router
C.Four port WAP
D.Four port hub

单项选择题

A user states that they cannot access a network shared drive. The technician has verified that the clients network cable is good. The IP address of the machine is 169.254.10.15. Which of the following is the cause of the problem？（）

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

Ensuring that data is transmitted securely over an IP network is the main purpose of：（）

A.Telnet
B.FTP
C.SIP
D.TLS