TherearedifferentwaystoperformIPbasedDoSAttacks.ThemostcommonIPb

TherearedifferentwaystoperformIPbasedDoSAttacks.ThemostcommonIPbasedDoSattackisthatanattackersendsanextensiveamountofconnectionestablishment()(e.g.TCPSYNrequests)toestablishhangingconnectionswiththecontrolleroraDPS.Suchaway,theattackercanconsumethenetworkresourceswhichshouldbeavailableforlegitimateusers.Inother(),theattackerinsertsalargeamountof()packetstothedataplanebyspoofingallorpartoftheheaderfieldswithrandomvalues.Theseincomingpacketswilltriggertable-missesandsendlotsofpacket-inflowrequestmessagestothenetworkcontrollertosaturatethecontrollerresources.Insomecases,an()whogainsaccesstoDPScanartificiallygeneratelotsofrandompacket-inflowrequestmessagestosaturatethecontrolchannelandthecontrollerresources.Moreover,thelackofdiversityamongDPSsfuelsfuelsthefastpropagationofsuchattacks.Legacy?mobilebackhauldevicesareinherentlyprotectedagainstthepropagationofattacksduetocomplexandvendorspecificequipment.Moreover,legacybackhauldevicesdonotrequirefrequentcommunicationwithcorecontroldevicesinamannersimilartoDPSscommunicatingwiththecentralizedcontroller.ThesefeaturesminimizeboththeimpactandpropagationofDoSattacks.Moreover,thelegacybackhauldevicesarecontrolledasajointeffortofmultiplenetworkelement.Forinstance,asingleLongTermEvilution(LT E)eNodeB?isconnectedupto32MMEs.Therefore,DoS/DDoSattackonasinglecoreelementwillnotterminatetheentireoperationofabackhauldevice(请作答此空)thenetwork.

A.or

B.of

C.in

D.to

正确答案是A