SimpleNetworkManagementProtocol(SNMP)isanInternetStandardprotocolforcollectingandorganizinginformationaboutmanageddevicesonIPnetworksandformodifyingthatinformationtochangedevice().SNMPisacomponentoftheInternetProtocolSuiteasdefinedbytheInternet()TaskForce.SNMPoperatesinthe()layeroftheInternetprotocolsuite.AllSNMPmessagesaretransportedviaUser(请作答此空)Protocol.AnSNMP-managednetworkconsistsofthreekeycomponents:a)Manageddevices,b)()(i.e.，softwarewhichrunsonmanageddevices),andc)Networkmanagementstation(NMS)(i.e.，softwarewhichrunsonthemanager). A.Datum B.Datagram
A.Dat
B.Packet
C.Dat
D.Message
正确答案是B