A.HTTPS B.TELNET C.SMTP D.DNS E.SSH
单项选择题Which of the following protocols would BEST grant the user secure access to a remote location?（）
A.VPN B.FTP C.POP3 D.DNS
单项选择题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
