多项选择题
A.S6502 B.S6503 C.S6506 D.S6506R
A.ATMAAL5 B.HDLC C.VLAN D.Ethernet
A.IPSec(InternetProtocolSecurityextensions) B.GRE(GenericRoutingEncapsulation) C.MPLS(Multi-ProtocolLabelSwitching) D.EON(CLNPoverIP)
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