单项选择题
A.Warnings only
B.debugging， informational， notifications， warnings
C.warnings， errors， critical， alerts， emergencies
D.notifications， warnings， errors
E.warnings， errors， critical， alerts
单项选择题 Youhave2NTPserversinyournetwork-10.1.1.1and10.1.1.2.YouwanttoconfigurationureaCiscoroutertouse10.1.1.2asitsNTPserverbeforefallingbackto10.1.1.1.Whichcommandswillyouusetoconfigurationuretherouter？（）
单项选择题 What level of logging is enabled on a Router where the following logs are seen？（）
单项选择题 The following commands are issued on a Cisco Router： What will the debug output on the console show？（）