BROADBANDLAB4: Networking Student's Name Course University Date

RunningHeadBROADBANDLAB-4: 1Networking
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BROADBANDLAB-4 2Executivesummary
ThetaskisgoingtocoveraboutTCPcongestioncontrol,whichmeansthecontrolofthenetworkcongestion.
Thefollowingtopicsaregoingtobediscussedabriefdescriptionofthemeaningofterm TCPcongestion
avoidance,theessentialcharacteristicsofCCsthatisexploredinthelablikeNewReno,CUBICandVegas,
examplesofCCsandadiscussionoftheyareusedintheinternettoday,thedefaultofTPCcongestion
controlmethod,TCPoptions,calculationofBandwidthDelayProductforthreedifferentscenarios,agraph
ofTCPMetrixvs.timeandthefollowingaretobediscussed;scenarioA,B,andCrepresent,howsockets
sendbufferoccupancy,andcwndvaluesarerelatedtoeachother,howtoobtainsmoothRTTestimates,how
stableRTTestimatesvarywiththebandwidth,how RTTpathaffectcwndgrowthandTCPoptionsthat
werediscussedandagreedonbythegroupsconcerningeachscenario.TCPcongestioncontrol,which
meansTransmissioncontrolprotocolsystem whichisusedincongestioncontrol.Thesystem congestion-
avoidancealgorithmisthecongestioncontrolprimarybasisontheinternetwhichisperprinciplefromone
pointtoanother,andthecentralsystem purposeistoserveasaninternethostbutnotthenetwork
specifically.AllofTCP'smeasuredround-tripsdelaysandtimeoutsthatweresetuptothemid-1990swere
generallybasedonlyonthepacketthatwastransmittedlastinthesendbuffer.Nevadaisalargecityof
whichTPCVegasisnamedafter,theround-tripdelaysandsettimeoutsaremeasuredineachpacketthatis
inthetransmitbuffer.TCPNewRenoishelpinginimprovingthetransmissionofTPCRenoduringthe
recoveryfast-face,foreachACKduplicateduringthefastrecoveryisthentakenbacktoTCPNewReno
afterthatanewpacketissentfromthecongestionwindowendthatisusedtofillthetransmitwindow.TPC
CUBICisidentifiedasamoresystematicderivativeandlessaggressiveoftheBIC,window whichisa
cubicfunctionoftimethatisfrom thelasteventcongestiontotheinflectionpointthatwassetbeforethe
windowevent.TCPcongestion-controlstrategyisthecongestioncontrolmainbasisontheinternetwhichis
perprinciplefromonelocationtoanother,thecongestionavoidancemainpurposeistoserveasaninternet
hostsbutnotthenetworkspecifically;basicallyitusesanalgorithm networkcongestion-avoidancewhich
hasthreephaseslikemultiplicativedecreasesystemtogetherwithothersystemslikecongestioncontroland
slowstartphasethatusedinthesuccessofavoidingthenetworkcongestion.

BROADBANDLAB-4 3Tableofcontent
Introduction 5
Question1 5
DescriptionofthetermTPCcongestioncontrol 5
Essentialcharacteristicsofcongestioncontrol 5
ExamplesofCCsandhowtheyareusedontheinternettoday 6
Question2 6
ThedefaultofTPCcongestioncontrolmethod 6
Question3 7
TCPoptions 7
Lab-basedquestion1 7
CalculationofBandwidthDelayProductforthreedifferentscenarios 7
Lab-basedquestion2 8
AgraphofTCPMetrixvs.time 8
Lab-basedquestion3 9
TCPoptionsagreedoneachscenario 10

BROADBANDLAB-4 4Conclusion 12
References 15
Appendices 17
Introduction
ThetaskisgoingtocoveraboutTCPcongestioncontrol,whichmeansthecontrolofthenetworkcongestion
(Cardwell
etal.2019).Thefollowingtopicsaregoingtobediscussedabriefdescriptionofthemeaningof
thetermTCPcongestionavoidance,theessentialcharacteristicsofCCsthatisexploredinthelablikeNew
Reno,CUBICandVegas,examplesofCCsandadiscussionoftheyareusedintheinternettoday,the
defaultofTPCcongestioncontrolmethod,TCPoptions,calculationofBandwidthDelayProductforthree
differentscenarios,agraphofTCPMetrixvs.timeandthefollowingaretobediscussed;scenarioA,B,and
Crepresent,howsocketssendbufferoccupancy,andcwndvaluesarerelatedtoeachother,howtoobtain
smoothRTTestimates,howstableRTTestimatesvarywiththebandwidth,howRTTpathaffectcwnd
growthandTCPoptionsthatwerediscussedandagreedonbythegroupsconcerningeachscenario
QUESTION1
BriefdescriptionofthemeaningofthetermTCPcongestionavoidance
TCPcongestioncontrol,whichmeansthecontrolofnetworkcongestion.TCPcongestion-avoidancecontrol