Which descriptions of Netflow is correct？（） A: By default，Netflow records bidirectional IP traffic flow. B: Netflow answers questions regarding IP traffic：who，what，where，when，and how C: Netflow accounts for both transit traffic and traffic destined for the router. D: Netflow returns the subinterface information in the flow records.

Gridlock is a form of traffic congestion with minimal flow which simply a traffic jam.

Which factor does the air cargo rates not affect A: Volume of traffic B: Airport scale C: Direction of traffic D: Characteristics of the traffic

A policeman was assigned to the school crossing because traffic there was so heavy. A: a B: an C: the D: one

Which two statements are true about traffic shaping and traffic policing？（） A: both traffic shaping and traffic policing cause retransmissions of connection-oriented protocols such as TCP B: both traffic shaping and traffic policing support the marking and re-marking of traffic C: the effects of traffic shaping and traffic policing when configured on a router are applied to outgoing traffic D: traffic shaping queues excess traffic whereas traffic policing discards excess traffic E: traffic shaping allows the traffic to exceed the bit rate whereas traffic policing prevents the traffic from exceeding the bit rate