多选题Which two statements about MPLS Label Distribution Protocol （LDP） are true？ （）ALDP hello packets are sent to TCP 646.BLDP session packets are sent to TCP 646.CLDP session packets are sent to TCP 711.DLDP hello packets are sent to TCP 711.ELDP hello packets are sent to UDP 711.FLDP hello packets are sent to UDP 646.
多选题
Which two statements about MPLS Label Distribution Protocol （LDP） are true？ （）
A
LDP hello packets are sent to TCP 646.
B
LDP session packets are sent to TCP 646.
C
LDP session packets are sent to TCP 711.
D
LDP hello packets are sent to TCP 711.
E
LDP hello packets are sent to UDP 711.
F
LDP hello packets are sent to UDP 646.
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