单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

What is the statistical reserve？（）

A.Bandwidth that is reserved for SVCs to route over a trunk
B.Bandwidth that is reserved on a trunk so that ABR connections can burst
C.Bandwidth on a trunk that is reserved for control traffic and cannot be used by connections
D.Bandwidth that cannot be allocated to connections but can be used to accommodate statistical variations in the traffic