单项选择题
In the Cisco Resilient Ethernet Protocol （REP）， how many ports are always blocking？（）
A.zero
B.at least one
C.at least two
D.at least four
E.at least three
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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
