單項(xiàng)選擇題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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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

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