多项选择题

A.Default MDT groups are used for PIM control traffic， ……

In relation to MPLS Multicast VPN， which three statements about multicast distribution （MDT） groups aretrue？（）

A.Default MDT groups are used for PIM control traffic， low-bandwidth sources， and flooding of sparse mode traffic.
B.MDTs are built in customer networks
C.Data MDT groups are used for high-bandwidth sources to reduce replication to uninterested PEs.
D.MDTs are built in provider networks
E.The number of MDTs depends on PIM modes of MDT groups.

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