单项选择题

Asanetworktechnician，doyouknowwhatisarecommendedpracticeforsecureconfigurationmanagement？（）

A.Disablepostscan
B.UseSSHorSSL
C.Enabletrustlevels
D.Denyechorepliesonalledgerouters
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单项选择题
panyusesMSTPwithintheirswitchedLAN.WhatisthemainpurposeofMultipleInstanceSpanningTreeProtocol（MSTP）？（）
A.ToenhanceSpanningTreetroubleshootingonmultilayerswitches
B.Toreducethetotalnumberofspanningtreeinstancesnecessaryforaparticulartopology
C.Toprovidefasterconvergencewhentopologychangesoccurinaswitchednetwork
D.ToprovideprotectionforSTPwhenalinkisunidirectionalandBPDUsarebeingsentbutnotreceived
E.Noneoftheotheralternativesapply
单项选择题
WhichofthefollowingspecificationsisacompaniontotheIEEE802.1wRapidSpanningTreeProtocol（RSTP）algorithm，andwarrantstheusemultiplespanning－trees？（）
A.IEEE802.1s（MST）
B.IEEE802.1Q（CST）
C.CiscoPVST+
D.IEEE802.1d（STP）
E.Noneoftheotheralternativesapply
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