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多項(xiàng)選擇題

Which of the following protocols encrypt communication?（）

A.HTTPS
B.TELNET
C.SMTP
D.DNS
E.SSH

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單項(xiàng)選擇題

Which of the following protocols would BEST grant the user secure access to a remote location?（）

A.VPN
B.FTP
C.POP3
D.DNS

單項(xiàng)選擇題

Which of the following devices is used to move frames between a source and destination basedon a MAC address?（）

A.Repeater
B.Hub
C.Router
D.Switch