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
单项选择题 Refer to the exhibit. Which of these is applied to the Bearer class？（）
单项选择题 Refer to the exhibit. Which switching feature is being tested？（）
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.
