SimpleNetworkManagementProtocol(SNMP)isanInternetStandardprotocolforcollectingandorganizinginformationaboutmanageddevicesonIPnetworksandformodifyingthatinformationtochangedevice().SNMPisacomponentoftheInternetProtocolSuiteasdefinedbytheInternet()TaskForce.SNMPoperatesinthe(请作答此空)layeroftheInternetprotocolsuite.AllSNMPmessagesaretransportedviaUser()Protocol.AnSNMP-managednetworkconsistsofthreekeycomponents:a)Manageddevices,b)()(i.e.，softwarewhichrunsonmanageddevices),andc)Networkmanagementstation(NMS)(i.e.，softwarewhichrunsonthemanager). A.physical
A.dat B.link C.transport D.application正确答案D
