单项选择题

Which network technology allows for the monitoring of active communication networks to diagnose problems and gather statistics for network administration?（）

A.Network security
B.Content networking
C.Network management
D.Campus local-area networking

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多项选择题

You are the network consultant from passguide.com. Do you know what attacks are software based attacks that disable your computer and attack user by e-mail?（）

A.Virus
B.Worm
C.Trojan
D.Executable

单项选择题

How does a switch respond when it receives a message?（）

A.It reads the Layer-5 information and sends the message directly to the intended computer.
B.It reads the Media Access Control (MAC) address and sends the message directly to the intended computer.
C.It reads the Layer-5 information and broadcasts the message to all the computers that are connected to the switch.
D.It reads the Media Access Control (MAC) address and broadcasts the message to all the computers that are connected to the switch.