多选题Regarding L2TP, in which two situations is a service module or service IOA required?（） (Choose two.)Aalways for LNSBalways for LACCLAC with fragmentation in the tunnelDLNS when there are greater than 2000 sessions
多选题
Regarding L2TP, in which two situations is a service module or service IOA required?（） (Choose two.)
A
always for LNS
B
always for LAC
C
LAC with fragmentation in the tunnel
D
LNS when there are greater than 2000 sessions
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