单项选择题

WhatistherelationshipbetweentheDomainNameSystem（DNS）andLDAP？（）

A.AlltherootDNSserversmaintaininformationinadistributedLDAPtree.
B.DNSclientsaccessDNSinformationbymakingLDAPqueriestoDNSservers.
C.AnLDAPDNattributeisaDomainName.
D.ItiscurrentlyrecommendedtoexpressDNasasequenceofDomaincomponents.

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AnarchitecturethatutilizesPPPoEdealswithIPaddressallocationbywhattypeofnegotiation？（）

A.NIS
B.IPCP
C.RADIUS
D.LDAP

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WhatisalsocalledType0authenticationinOSPFonCiscoRouters？（）

A.MD5
B.ThereisnoType0authentication
C.SHA1
D.Null