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單項選擇題

What layer of the TMN （telecommunications management network） model does CTM fit into？（）

A.Network management layer
B.Element management layer
C.Business management layer
D.Network element layer

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單項選擇題

What features set is most frequently used to prevent hackers from flooding a port with MAC- addresses？（）

A.BPDU Guard
B.802.x
C.Port Security
D.Storm Control

單項選擇題

ATT （Attached ）bit needs to be set in the link state PDUs in an IS-IS level-1-2 router to indicate that theyare a potential exit point out of the area.（）

A.True
B.False