单项选择题

Which of the following protocols is used to disable switch ports automatically to prevent switchingloops?（）

A.RIP
B.0S：F
C.STP
D.EGP

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单项选择题

Which of the following uses copper wiring?（）

A.10GBase-ER
B.10GBase-LW
C.100Base-FX
D.1000Base-T

单项选择题

Which of the following is a secure method of remote access via command line?（）

A.RCP
B.Telnet
C.RSH
D.SSH

单项选择题

An administrator is using a protocol analyzer to monitor traffic between two servers. However, the only traffic that appears is broadcast and traffic originating from the administrator's PC.
Which of the following devices is the administrator plugged into? （）

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