Which two Any Transport over MPLS （AToM） traffic encapsulations require the use of a control word？（）A、HDLCB、ATM AAL5C、PPPD、Ethernet VLANE、Frame Relay
Which two Any Transport over MPLS （AToM） traffic encapsulations require the use of a control word？（）
- A、HDLC
- B、ATM AAL5
- C、PPP
- D、Ethernet VLAN
- E、Frame Relay
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