Whichtwostatementsaretrueabouttrustboundaries？（）
A. Classifyingandmarkingtrafficshouldbedoneasclosetothetrafficsourceaspossible.
B. Classifyingandmarkingtrafficshouldbedoneatthedistributionlayer.
C. Trafficisclassifiedandmarkedasittravelsthroughthenetwork.
D. Ifuntrustedtrafficentersaswitch，itcanbemarkedwithanewQoSvalueappropriateforthepolicyinplace.
E. Thetrustboundarymovesdependingonthetypeoftrafficenteringthenetwork.
查看答案
渐进多焦点的显性标记包括远用参考圈，配镜十字，近用参考圈，材料和商标等。（)
沟槽位置从镜片最薄边缘部位设定，原则上最薄处不得小于1mm。（)
Duringvoiceimplementation，whichtworequireditemsareconfiguredatanaccesslayerswitchconnectedtoanIPphonetoprovideVoIPcommunication？（）
A. allowedcodecs
B. nativeVLAN
C. auxiliaryVLAN
D. CiscoUnifiedCommunicationsManagerIPaddress
E. RSTP
微信支付 
支付宝支付