问答题 You work as a network technician at Certkiller .com. Your boss， Mrs. Certkiller， is interested in WAN Services.Match the appropriate WAN Services with the correct service type.

单项选择题 IfvoiceanddatatrafficwillbesentandreceivedviaaWANlinks，whatmustbeconfiguredtoprovideacertainamountofdedicatedbandwidthandtoprioritizethevoicetrafficoverothertypesofnetworktraffic？（）

多项选择题 You work as a network technician at Certkiller .com. Please study the exhibit carefully. All of the computing devices shown are on the same logical network， as if they were all connected to the same switch. Which two features make this possible？（）