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
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单项选择题
IntheCiscoResilientEthernetProtocol（REP），howmanyportsarealwaysblocking？（）
A.zero
B.at least one
C.at least two
D.at least four
E.at least three -
多项选择题
WhichtwostatementsaboutOSPFIPv6routingaretrue？（）
A.It requires OSPF version 3.
B.automatically detects neighbors over NHMA interfaces
C.It supports encryption using
D.It uses LSA type 9
E.It uses LSA type 8
