ThenumberofhomeusersandsmallbusinessesthatwanttousetheInternetiseverincreasing.Theshortageofaddressesisbecomingaseriousproblem.Aquicksolutiontothisproblemiscallednetworkaddresstranslation(NAT).NATenablesausertohavealargesetofaddresses()andoneaddress,orasmallsetofaddresses,externally.Thetrafficinsidecanusethelargeset;thetraffic(),thesmallset.ToseparatetheaddressesusedinsidethehomeorbusinessandtheonesusedfortheInternet,theInternetauthoritieshavereservedthreesetsofaddressesas()addresses.AnyorganizationcanuseanaddressoutofthissetwithoutpermissionfromtheInternetauthorities.Everyoneknowsthatthesereservedaddressesareforprivatenetworks.Theyare(请作答此空)insidetheorganization,buttheyarenotuniqueglobally.Norouterwill()apacketthathasoneoftheseaddressesasthedestinationaddress.ThesitemusthaveonlyonesingleconnectiontotheglobalInternetthrougharouterthatrunstheNATsoftware.
A.unique B.observable C.particular D.ordinary正确答案A
