多项选择题 Refer to the exhibit. A network engineer received a sudden request to prioritize voice over his Cisco network and he has decided to leverage the AutoQoS feature. Based on the output shown, which two tasks need to be performed prior to issuing the autoqos voip command in this router? （）

单项选择题 WhatsthedefaultstratumclockonaCiscorouter，whenyouseethekeyword"master"configuredontheNTPline？（）

问答题 先描述的就是源树。然后说源和receiver通讯，问process叫什么？