A.Configurefront-endserverstouseHTTPtocommunicatewithback-endservers
B.ConfiguretheinternalfirewalltoallowIPSectrafficbetweenfront-endandback-endExchangeservers
C.Requirealluserstoencryptalloutbounde-mailmessages
D.Issuedigitalcertificatestoallremoteusers.RequirethecertificatestobeusedwhenauthenticatingtoOutlookWebAccess
参考答案:B