Zte ZXR10 5900 Series - Page 62

ZXR105900/5200SeriesUserManual(BasicCongurationVolume)
Class
Prex
Characteristic
Bit
NetworkBitHostBit
Range
ClassD
1110
MulticastAddress
224.0.0.0~
239.255.255.255
ClassE
1111
Reserved
240.0.0.0~
255.255.255.255
SomeClassA,BandCaddressesarereservedforprivatenet-
works.Itisrecommendedthattheinternalnetworkshoulduse
theprivatenetworkaddress.Theseaddressesreferto:
�ClassA:10.0.0.0~10.255.255.255
�ClassB:172.16.0.0~172.31.255.255
�ClassC:192.168.0.0~192.168.255.255
Thisaddressclassicationmethodistofacilitateroutingprotocol
designing.Fromthismethoditcanbeknownthenetworktypejust
bytheprexcharacteristicbitoftheIPaddress.Thismethod,
however ,cannotmakethebestoftheaddressspace.Withthe
dramaticexpansionofInternet,problemofaddressshortagebe-
comesincreasinglyserious.
TomakemostofIPaddresses,networkcanbedividedintomultiple
subnets.Borrowsomebitsfromthehighestbitofthehostbitas
thesubnetbit.Remainingpartofthehostbitstillservesasthe
hostbit.Thus,thestructureofanIPaddressconsistsofthree
parts:Networkbits,subnetbitsandhostbits.
Thenetworkbitsandsubnetbitsareusedtouniquelyidentifya
network.UsethesubnetmasktondwhichpartintheIPaddress
indicatesnetworkbitsandsubnetbitsandwhichpartstandsfor
hostbits.Thepartwithsubnetmaskof"1"correspondstothe
networkbitsandsubnetbitsoftheIPaddress,whilethepartwith
subnetmaskof"0"correspondstohostbits.
ThedivisionofthesubnetgreatlyimprovestheutilizationofIP
address,andalleviatestheproblemofIPaddressshortage.
RegulationsonIPaddresses:
1.0.0.0.0isusedwhenahostwithoutanIPaddressisstarted.
RARP ,BOOTPandDHCPareusedtoobtaintheIPaddress.The
addressservesasthedefaultrouteintheroutingtable.
2.255.255.255.255isadestinationaddressusedforbroadcast
andcannotserveasasourceaddress.
3.127.X.X.Xiscalledtheloop-backaddress.
4.OnlyanIPaddresswithhostbitsbeingall"0"indicatethe
networkitself.AnIPaddresswithhostbitsbeingall"1"serves
asthebroadcastaddressofthenetwork.
5.ForalegalhostIPaddress,thenetworkpartorthehostpart
shouldnotbeall"0"orall"1".
48CondentialandProprietaryInformationofZTECORPORATION