A.Itholdssecuritypoliciesforparticularhosts.
B.Itholdsstatisticsabouttraffictoandfromparticularhosts.
C.Itdefineshostsinazonesotheycanbereferencedbypolicies.
D.ItmapshostnamestoIPaddressestoserveasabackuptoDNSresolution.
参考答案：C
AItholdssecuritypoliciesforparticularhostsBItholdsstatist
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