单项选择题
Which statement about ATM AAL5 over MPLS is true？（）
A.It supports ATM signaling. B.It supports traffic shaping of packets in MPLS to the ATM path. C.It supports ATM switched virtual circuits D.It supports fragmentation and reassembly. E.It supports AAL5 SDU switching
单项选择题 IntheCiscoResilientEthernetProtocol（REP），howmanyportsarealwaysblocking？（）
多项选择题 WhichtwostatementsaboutOSPFIPv6routingaretrue？（）
