多项选择题
Which three of these statements about the IP service level agreement （SLA） sender are true？ （）
A.SLA sender target can be an IP host B.SLA sender sends a probe packet and a response probe packet C.SLA sender sends a probe packet D.SLA sender target must be a router E.SLA sender target can be an IP SLA responder
多项选择题 WhichthreeofthesestatementsaboutPPPoParetrue？（）
多项选择题 Whichtwostatementsaboutspanningtreepathcostaretrue？（）
多项选择题 WhichtwoAnyTransportoverMPLS（AToM）trafficencapsulationsrequiretheuseofacontrolword？（）
