多项选择题
Modified deficit round robin supports which of these functionalities？（）
A.priority queue B.weighted fair queues C.round-robin service of output queues D.LLQ
单项选择题 WhichofthesestatementsbestdescribesthemajordifferencebetweenanIPv4-compatibletunnelanda6to4tunnel？（）
单项选择题 NBARsupportsallofthesewiththeexceptionofwhichone？（）
单项选择题 WhichofthesecorrectlyidentifiesadifferencebetweenthewayBPDUsarehandledby 802.1wand802.1D？（）
