单项选择题
A.Make all ports private VLAN ports.
B.Place all unused ports in native VLAN 1 until needed.
C.Proactively configure unused switch ports as access ports.
D.Disable Cisco Discovery Protocol globally.
单项选择题 Three Cisco Catalyst switches have been configured with a first-hop redundancy protocol. While reviewing some show commands， debug output， and the syslog， you discover the following information： What conclusion can you infer from this information？（）
单项选择题 You work as a network engineer for . You study the exhibit carefully. Three switches are configured for HSRP. Switch1 remains in the HSRP listen state. What is the most likely cause of this status？（）
多项选择题 hostname Switch1 interface Vlan10 ip address 172.16.10.32 255.255.255.0 no ip redirects standby 1 ip 172.16.10.110 standby 1 timers 1 5 standby 1 priority 130 hostname Switch2 interface Vlan10 ip address 172.16.10.33 255.255.255.0 no ip redirects standby 1 ip 172.16.10.110 standby 1 timers 1 5 standby 1 priority 120 HSRP was implemented and configured on two switches while scheduled network maintenance was performed. After the two switches have finished rebooting， you notice via show commands that Switch2 is the HSRP active router. Which two items are most likely the cause of Switch1 not becoming the active router？ （）