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单项选择题When should you enable Network Address Translation Transparency (NAT-T) on the Teleworker?()

A、when a router between the Teleworker router and the head-end VPN router is doing NAT/pNAT and does not support IPSec pass-through 

B、when the Teleworker router itself is doing NAT/pNAT

C、always

D、never

  • A
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