多项选择题
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
多项选择题 Which three are correct about L2TP tunnel selection algorithms? （）(Choose three.)
单项选择题 How may L2TP tunnel destinations are allowed per domain?（）
多项选择题 Which two statements are true about L2TP tunnels?（） (Choose two.)
