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