网络基础Assignment英文Word文档格式.docx

网络基础Assignment英文Word文档格式.docx

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Dataunit

Layer

Function

Host

layers

Data

7.Application

Networkprocesstoapplication

6.Presentation

Datarepresentation,encryptionanddecryption,convertmachinedependentdatatomachineindependentdata

5.Session

Interhostcommunication,managingsessionsbetweenapplications

Segments

4.Transport

End-to-endconnections,reliabilityandflowcontrol

Media

Packet/Datagram

3.Network

Pathdeterminationandlogicaladdressing

Frame

2.Datalink

Physicaladdressing

Bit

1.Physical

Media,signalandbinarytransmission

（3）Therelationshipoflayers.

Movingfromthetop,down-messagesgetlargerandlarger.Amessageispasseddown,andthelowerlayeraddsaheadertoit.Thisiscalledencapsulation,becauseitislikeplacinganobjectintoacapsule.Theheaderissometimescalledawrapper.Eachsuccessivelowerlayerencapsulateswhatitreceivesfromthelayeraboveit.

Movingfromthebottom,up-messagesgetsmallerandsmaller.Amessageisfirststrippedofit'

sheader,andthentheinnercontents（the"

data"

portion）ispassedup.Thisis"

decapsulation"

butnooneusesthatterm.Eachsuccessiveupperlayerreceivesthedatamessagefromthelayerbelow,andthenstripsoffit'

sownheaderandpassesthedataup.

2.Explaintheroleofdriversinanetwork,discussingtheirrelationshiptotheNOSandOSImodel.（Outcome4.2）

（1）Thefunctionofdriversinanetwork.

LANdriversdirectthefunctionofthehardwareusedtotransferdatatoandfromcomputersintheLAN.Thesedriverscomeinmanytypes,andtheycanbeinstalledonauser'

scomputeroronasharedserver.Networkhardwaredevices,whichmightneedLANdriverstofunction,includenetworkrouters,modems,networkcards,ornetworkcardadapters.

（2）Drivers’relationshiptotheWindowsserver2003.

DriversareonekindsofsoftwarehelpcommunicationbetweenWin2003andhardware.Theconnectinghardwarecanneverworkwithoutthematchingdriver.Inusually,Win2003ownsthedriver.Itcanupdatethedriverbythe“WindowsUpdate”fromthecontrolplatform.Ifitdidn’townsthedriver,thenitneedtheCDwhichastheadditionalwiththehardware,orsearchanddownloadfromtheinternet.

（3）Drivers’relationshiptotheOSImodel.

Differentdriverworksondifferentlayer.TheFilesystemdriverworksonapplicationlayer,sessionandpresentationlayers.ThegatewayworksontheTransportlayer.TherouterworksontheNetworklayer.TheswitchworksontheDatalinklayer.TherepeaterworksonPhysicallayer.

3.Discusshowdriversareselectedandimplementedforvariousnetworkcomponents;

installNICdriveranddemonstratehowtoremoveandupdate.（Outcome4.3）

（1）Discusshowdriversareselectedandimplementedforsoundcard,networkinterfacecardandvideocard.

Everycomputerhasitsowndriversincludessoundcard,networkinterfacecardandvideocardandsoon.Whenwebuythecomputer,aCD/DVDcontaindriverswillbegiveus.WecanusetheCD/DVDstoselectandimplementthedrivers.Andwecandownloadsomedriversoftwaretocheckoutwhetherourcomputerlackofdrivers,thenselectthedriverandimplementit.

（2）InstallMicrosoftLoopbackAdapterdriver.

Followingarethefiguresforinstallsteps:

Figure3-1Installation1

Figure3-2Installation2

Figure3-3Installation3

Figure3-4Installation4

Figure3-5Installation5

Figure3-6Installation6

Figure3-7Installation7

Figure3-8Installation8

（3）RemoveandupdatetheMicrosoftLoopbackAdapterdriver.

Followingarefiguresshowthestepsforremoveandupdate:

Figure3-9Step1

Figure3-10Step2

Figure3-11Removeandupdate

4.ExplainthedetailedoperationofdifferentIEEE802.Nnetworkconfigurations.（Outcome4.4）

Table4-1ThedetailedoperationofdifferentIEEE802.N

Specification

Description

802.1

SetsInternetworkingstandardsrelatedtonetworkmanagement.

802.2

Definesthegeneralstandardforthedata-linklayer.TheIEEEdividesthislayerintotwosublayers:

theLLCandMAClayers（discussedinthepreviouslesson）.TheMAClayervarieswithdifferentnetworktypesandisdefinedbystandardIEEE802.3.

802.3

DefinestheMAClayerforbusnetworksthatuseCarrier-SenseMultipleAccesswithCollisionDetection（CSMA/CD）.ThisistheEthernetStandard.

802.4

DefinestheMAClayerforbusnetworksthatuseatoken-passingmechanism（TokenBusLAN）.

802.5

DefinestheMAClayerfortokenringnetworks（TokenRingLAN）.

802.6

Setsstandardsformetropolitanareanetworks（MANs）,whicharedatanetworksdesignedfortownsorcities.Intermsofgeographicbreadth,