《子网概念》PPT课件

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1、LANConnectionsConstructingaNetworkAddressingSchemeFlatTopologyProblemsAlldevicessharethesamebandwidth.Alldevicessharethesamebroadcastdomain.Itisdifficulttoapplyasecuritypolicy.SubnetworksSmallernetworksareeasiertomanage.Overalltrafficisreduced.Youcanmoreeasilyapplynetworksecurity

2、policies.WhataSubnetMaskDoesTellstherouterthenumberofbitstolookatwhenroutingDefinesthenumberofbitsthataresignificantUsedasameasuringtool,nottohideanythingPossibleSubnetsandHostsforaClassCNetworkPossibleSubnetsandHostsforaClassBNetworkPossibleSubnetsandHostsforaClassANetworkEndSys

3、temSubnetMaskOperationHowRoutersUseSubnetMasksApplyingtheSubnetAddressSchemeOctetValuesofaSubnetMaskSubnetmasks,likeIPaddresses,arerepresentedinthedotteddecimalformatlike255.255.255.0DefaultSubnetMasksExampleClassAaddress(decimal):10.0.0.0ExampleClassAaddress(binary):00001010.000

4、00000.00000000.00000000DefaultClassAmask(binary):11111111.00000000.00000000.00000000DefaultClassAmask(decimal):255.0.0.0Defaultclassfulprefixlength:/8ExampleClassCaddress(decimal):192.168.42.0ExampleClassCaddress(binary):11000000.10101000.00101010.00000000DefaultClassCmask(binary

5、):11111111.11111111.11111111.00000000DefaultClassCmask(decimal):255.255.255.0Defaultclassfulprefixlength:/24ExampleClassBaddress(decimal):172.16.0.0ExampleClassBaddress(binary):10010001.10101000.00000000.00000000DefaultClassBmask(binary):11111111.11111111.00000000.00000000Default

6、ClassBmask(decimal):255.255.0.0Defaultclassfulprefixlength:/16ProcedureforImplementingSubnetsDeterminetheIPaddressassignedbytheregistryauthority.Basedontheorganizationalandadministrativestructure,determinethenumberofsubnetsrequired.Basedontheaddressclassandrequirednumberofsubnets

7、,determinethenumberofbitsyouneedtoborrowfromthehostID.Determinethebinaryanddecimalvalueofthesubnetmask.ApplythesubnetmasktothenetworkIPaddresstodeterminethesubnetandhostaddresses.Assignsubnetaddressestospecificinterfaces.EightEasyStepsforDeterminingSubnetAddressesEightEasyStepsfo

8、rDeterminingSubnetAddresses(Cont.)Exampl