单项选择题

WhentwobridgesarecompetingfortherootbridgeofanIEEE802.1Dspanningtreeandbothhavethesamebridgepriorityconfigured，whichparameterdeterminesthewinner？（）

A.highest-numberedIPinterface
B.MACaddress
C.deviceuptime
D.rootportcost
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单项选择题
WhatistherelationshipbetweentheDomainNameSystem（DNS）andLDAP？（）
A.AlltherootDNSserversmaintaininformationinadistributedLDAPtree.
B.DNSclientsaccessDNSinformationbymakingLDAPqueriestoDNSservers.
C.AnLDAPDNattributeisaDomainName.
D.ItiscurrentlyrecommendedtoexpressDNasasequenceofDomaincomponents.
单项选择题
AnarchitecturethatutilizesPPPoEdealswithIPaddressallocationbywhattypeofnegotiation？（）
A.NIS
B.IPCP
C.RADIUS
D.LDAP
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