单项选择题
A. By calculating the time offset from the GPS or atomic clock
B. By setting the router clock to the default value if the router can't connect to a time server
C. By setting all network devices to the correct time
D. By setting necessary time date in the timestamp information
单项选择题 Which of the following can we draw from the given information concerning the class-map "all-traffic"?（）
单项选择题 Which one of these class maps was configured to match traffic for CS5?（）
多项选择题 You are an experienced network administrator in an international company. During your working hours, customers complain that they experience intermittent data loss and they intermittently fail to connect to crucial servers. As shown in the following topology, the 802.1Q trunk between DSW111 and ASW1 fails. Though DSW112 is in the service of HSRP group 11, the SVI for VLAN 11 is up on DSW111. So as to figure out the problem, which three commands should you issue on DSW111? （）(Choose three.)