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A.LCP is used for PPP over ATM （PPPoA） setup.
B.LCP is used for PPP over Ethernet （PPPoE） setup.
C.LCP is used for PPP over Ethernet （PPPoPR） setup.
D.LCP is used for PPP CHAP authentication.
E.LCP is used for basic PPP link setup and operation.

A.NetFlow records unidirectional IP traffic flow.
B.NetFlow records MPLS frame flow.
C.NetFlow expert is only over TCP.
D.NetFlow records is only over UDP.
E.NetFlow records subinterface information of traffic flow.