A.OSPFexternalLSAsareautomaticallyfloodedintoallOSPFareas，unliketype7LSAs，whichrequirethatredistributionbeconfigured.
B.ExternalLSAs（type5）areautomaticallychangedtotype1LSAsatASBRs.
C.Type5LSAsareroutesummariesdescribingroutestonetworksoutsidetheOSPFAutonomousSystem.
D.ExternalnetworkLSAs（type5）redistributedfromotherroutingprotocolsintoOSPFarenotpermittedtofloodintoastubarea.
正确答案：参考D
