Which of these tools should you use to compress VoIP packets on a low-speed Frame Replay circuit?（）

单项选择题Which version of NTP was the first to support cryptographic authentication?（）

A.Version 1
B.Version 5
C.Version 4
D.Version 3

单项选择题How does NTP help you troubleshoot network problems?（）

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 ?（）

A. The class-map "all-traffic" will match all traffic with ip precedence 4 and 5
B. The class-map "all-traffic" will match all traffic with dscp 18 or dscp 43
C. The class-map "all-traffic" will match all traffic with ip precedence 0 or 1
D. The class-map "all-traffic" will match all traffic with dscp 18 and dscp 43

单项选择题Which one of these class maps was configured to match traffic for CS5?（）

A. CIS 1# show class-map forward Class map match-all forward ( id 3) Match ip dscp 18
B. CIS1#show access-map block Class map match-all block (id 4) Match ip dscp 43
C. CIS1# show class-map real-time Class map match-all block (id 5) Match ip dscp 16
D. CIS 1# show class-map pass Class map match-all real-time (id 2) Match ip dscp 40

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.)

A. show standby vlan 11 brief
B. show interfaces vlan 11
C. show spanning-tree vlan 11
D. show interfaces mod/port trunk