单项选择题
A.LLQ
B.FIFO
C.CBWFQ
D.priority queuing
E.weighted fair queuing
F.IP RTP priority queuing
多项选择题 WhichthreeofthesestatementsaboutDynamicTrunkingProtocolarecorrect？（）
单项选择题 WhichofthesecorrectlyidentifiesadifferencebetweenthewayBPDUsarehandledby802.1wand802.1D？（）
问答题 R1，R2，R3 are all in same ospf area， there is a virtual link between R1 and R3. Pls answer： Are the hello packets exchanged between the virtual link？
