单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
Which of the following WAN technologies uses a telephone cable?（）
A.POTS
B.FDDI
C.SONET
D.Cable modem
