TheInternetisbasedonconnectionlessend-to-endpacketservice,whichtraditionallyprovidedbest-effortmeansofdata()usingtheTransmissionControlProtocol/InternetProtocolSuite.Althoughthe(请作答此空)designgivestheInternetitsflexibilityandrobustness,itspacketdynamicsalsomakeitpronetocongestionproblems,especiallyat()thatconnectnetworksofwidelydifferentbandwidths.TheinitialQoSfunctionsetwasforinternethosts.Onemajorproblemwithexpensivewide-area()linksistheexcessiveoverheadduetosmallTransmissionControlProtocolpacketscreatedbyapplicationssuchastelnetandrlogin.TheNagle()，whichsolvesthisissue,isnowsupportedbyallIPhostimplementations.
A.connectionless B.connection C.connection-oriented D.connotation正确答案A
