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

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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

单项选择题

What is TCI？（）

A.Tag Calling Interface
B.Tag Control Identifier
C.ToS Class Interface
D.Tag Control Information