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單項選擇題

At which of the following layers does the ICMP protocol operate?（）

A.Layer 1
B.Layer 3
C.Layer 4
D.Layer 5

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單項選擇題

Which of the following security devices would MOST likely be used on a network to screen and prevent malicious traffic?（）

A.IDS
B.VPN
C.NIPS
D.HIDS

單項選擇題

Which of the following is an intelligent repeater that is aware of the MAC addresses of the nodeson either side of the data link?（）

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

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