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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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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
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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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