单项选择题

Why does RSTP have a better convergence time than 802.1D？（）

A.it is newer
B.it has smaller timers
C.it has less overhead
D.it is not timer-based

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单项选择题

Refer to the exhibit. Which of these is applied to the Bearer class？（）

A.WRED
B.traffic shaping
C.packet marking
D.packet classification
E.FIFO queuing within the class

单项选择题

Refer to the exhibit. Which switching feature is being tested？（）

A.loop guard
B.PortFast
C.root guard
D.BDPU guard

问答题

R1（AS1）------R2（AS2）-----R3（AS2）----R4（AS2），R1在AS1，R2，R3，R4在AS2，R1和R2建EBGP ， R2和R3 IBGP，R3和R4 IBGP，产生BGP路由从R1传给R2，问这条路有会不会在R4上出现，如果不会，怎么解决.