单项选择题

WhichtypeoffirewallisneededtoopenappropriateUDPportsrequiredforRTPstreams？（）

A.Statefulfirewall
B.Proxyfirewall
C.Packetfilteringfirewall
D.Statelessfirewall
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单项选择题
WhatactionwillaBGProutereflectortakewhenitreceivesaprefixmarkedwiththecommunityattributeNOADVERTISEfromaclientpeer？（）
A.Itwilladvertisetheprefixtoallotherclientpeersandnon-clientpeers.
B.ItwillnotadvertisetheprefixtoEBGPpeers.
C.ItwillonlyadvertisetheprefixtoallotherIBGPpeers.
D.Itwillnotadvertisetheprefixtoanypeers.
单项选择题
WhentwobridgesarecompetingfortherootbridgeofanIEEE802.1Dspanningtreeandbothhavethesamebridgepriorityconfigured，whichparameterdeterminesthewinner？（）
A.highest-numberedIPinterface
B.MACaddress
C.deviceuptime
D.rootportcost
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